Database: INSPEC Provider: OCLC Database: INSPEC Copyright: Copyright 2001, IEE Accession No: 7024063 INSPEC Abstract No: B2001-10-1320-051 Author(s): Fumagalli, M.; Macchiarella, G.; Resnati, G. Editor: Sigmon, B. Corp Source: FOREM S.r.l., Agrate Brianza, Italy Title: Dual-mode filters for cellular base stations using metallized dielectric resonators Source: 2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157) p. 3 vol.(lxiii+xxiv+xxiii+2262), 1799-802 vol.3 Publication: USA ISBN: 0780365380 Language: English Publisher: IEEE; Piscataway, NJ, USA Conference: 2001 IEEE MTT-S International Microwave Symposium Digest Conference Loc: Phoenix, AZ, USA; 20-25 May 2001 Year: 2001 Copyright No: 0 7803 6538 0/2001/$10.00 Treatment: A Application; N New Development; P Practical Record Type: Conference Paper Abstract: A novel configuration for dual-mode filters employing dielectric ring resonators is presented. The coupling between two orthogonal polarized modes (HEM/sub 11/) within each dielectric ring is realized through a rectangular metallic strip deposited on the boundary of the ring (inner or outer). The coupling coefficient so obtained is large enough to allow the realization of high selectivity filters for cellular radio base stations. A 4 resonators test filter has been designed and realized using the novel resonators: the performances obtained are reported in the paper (4 Refs.) Descriptor(s): cellular radio; dielectric resonator filters; passive filters; UHF filters Identifier: cellular base stations; metallized dielectric resonators; dual-mode filters; dielectric ring resonators; orthogonal polarized modes; HEM/sub 11/ mode; rectangular metallic strip; coupling coefficient; high selectivity filters; radio base stations Class Code: B1320 (Waveguide components); B1270D (Passive filters and other passive networks); B6250F (Mobile radio systems) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Copyright: Copyright 2001, IEE Accession No: 6826211 INSPEC Abstract No: B2001-03-7320X-001 Author(s): Zhangyou Chen; Okamura, S. Editor: Feng, Z.; zhang, Y. Corp Source: Dept. of Electron. Eng., Shizuoka Univ., Hamamatsu, Japan Title: Moisture measurement by dielectric ring resonator in microwave range Source: ICMMT 2000. 2000 2nd International Conference on Microwave and Millimeter Wave Technology Proceedings (Cat. No.00EX364) p. xxvii+762, 642-5 Publication: USA ISBN: 0780357434 Language: English Publisher: IEEE; Piscataway, NJ, USA Sponsor: Chinese Inst. Electron.(CIE); IEEE Beijing Sect.; IEEE Beijing Center; IEEE MTT-S Beijing Chapter; IEEE Microwave Theory and Tech. Soc.; IEEE Electron Devices Soc.; IEEE Antennas & Propagation Soc.; Electron Soc.. IEICE of Japan; Korea Inst. Telematics & Electron.; World Sci. & Eng. Soc Conference: Proceedings of International Conference on Microwave and Millimeter Wave Technology Conference Loc: Beijing, China; 14-16 Sept. 2000 Year: 2000 Copyright No: 0 7803 5743 4/2000/$10.00 Treatment: T Theoretical or Mathematical; X Experimental Record Type: Conference Paper Abstract: This paper presents a study on the measurement of material moisture in the microwave range. The dielectric ring resonator is utilized as the model for both theoretical analysis and measurement. It denotes that the TM/sub 011/ mode has high accuracy with its measurable range of moisture up to 40% (dry basis), and the HE/sub 211/ mode has a measurable range of more than 100% with acceptable accuracy (7 Refs.) Descriptor(s): dielectric resonators; measurement theory; microwave measurement; moisture measurement; permittivity measurement Identifier: moisture measurement; dielectric ring resonator; microwave range; TM/sub 011/ mode; HE/sub 211/ mode Class Code: B7320X; B7310N (Microwave measurement techniques); B7310K (Dielectric variables measurement); B1320 (Waveguide components); B2890 (Other dielectric applications and devices); B7110 (Measurement theory) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 373 Copyright: Copyright 2001, IEE Accession No: 6824709 INSPEC Abstract No: B2001-03-1320-005 Author(s): Macchiarella, G.; Fumagalli, M.; D'Oro, S.C. Corp Source: Dipartimento di Elettronica e Inf., Politecnico di Milano, Italy Title: A new coupling structure for dual mode dielectric resonators Source: IEEE Microwave and Guided Wave Letters, vol.10, no.12 p. 523-5 ISSN: 1051-8207 CODEN: IMGLE3 Publication: USA Language: English Publisher: IEEE Year: Dec. 2000 Copyright No: 1051-8207/2000/$10.00 Treatment: A Application; N New Development; P Practical; X Experimental Record Type: Journal Paper Abstract: A novel method for realizing coupling between two orthogonal HEM/sub 11/ resonant modes in dielectric ring resonators is described. The coupling is obtained by means of a metallic strip located on the inner or on the outer boundary of the dielectric ring; a strong coupling is obtained, even with a small width of the strip, in particular when the strip is on the inner boundary. The dual-mode resonator is then suitable for filtering applications, with normalized bandwidth requirements exceeding 1% (as in base station units for mobile communications), allowing a relevant reduction of the overall volume, at the expense of a small reduction of the unloaded Q. The novel coupling mechanism and the Q degradation produced have been studied both numerically (by using finite elements simulations) and experimentally (measurements from a prototype two-resonators filter are reported) (5 Refs.) Descriptor(s): dielectric resonator filters; dielectric resonators; passive filters; Q-factor; UHF filters Identifier: coupling structure; dual mode dielectric resonators; orthogonal HEM/sub 11/ resonant modes; dielectric ring resonators; metallic strip; filtering applications; unloaded Q; Q degradation; finite elements simulations; prototype two-resonators filter; dual mode DR; DR filters; 2.34 GHz Class Code: B1320 (Waveguide components); B2890 (Other dielectric applications and devices); B1270D (Passive filters and other passive networks); B1350 (Microwave circuits and devices) Numerical Ind: frequency 2.34 E+09 Hz -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 131 Copyright: Copyright 1999, IEE Accession No: 6436991 INSPEC Abstract No: B2000-01-1320-015 Author(s): Amari, S.; Bornemann, J.; Vahldieck, R. Corp Source: Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada Title: A technique for designing ring and rod dielectric resonators in cutoff waveguides Source: Microwave and Optical Technology Letters, vol.23, no.4 p. 203-5 ISSN: 0895-2477 CODEN: MOTLEO Publication: USA Language: English Publisher: Wiley Year: 20 Nov. 1999 Treatment: T Theoretical or Mathematical Record Type: Journal Paper Abstract: A simple expression for the length of a dielectric ring or rod resonator in a cutoff circular waveguide is given. Instead of using a determinant equation to design the resonator, is it only required to determine the phase of the reflection coefficient of the resonating mode at a step discontinuity between an infinitely long rod or ring and an infinitely long cutoff waveguide. The technique is validated by comparison to an analytical solution, as well as previously published results (7 Refs.) Descriptor(s): circular waveguides; dielectric resonator filters; dielectric-loaded waveguides; waveguide filters Identifier: dielectric ring resonators; dielectric rod resonators; cutoff circular waveguide; dielectric resonator design; reflection coefficient; step discontinuity; infinitely long rod; infinitely long ring; infinitely long cutoff waveguide Class Code: B1320 (Waveguide components); B2890 (Other dielectric applications and devices) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Copyright: Copyright 1999, IEE Accession No: 6369822 INSPEC Abstract No: B1999-11-1320-016 Author(s): Amari, S.; Vahldieck, R.; Bornemann, J. Corp Source: Lab. for Field Theory & Microwave Electron., Fed. Inst. of Technol., Zurich, Switzerland Title: Full-wave design and analysis of bandpass filters using 1/8-cut high-Q dielectric ring resonators Source: 28th European Microwave Conference Proceedings p. 2 vol. (viii+750+789), 424-7 vol.2 Publication: UK ISBN: 0862131413 Language: English Publisher: Miller Freeman UK; London, UK Conference: 28th European Microwave Conference Proceedings Conference Loc: Amsterdam, Netherlands; 6-8 Oct. 1998 Year: 1998 Treatment: T Theoretical or Mathematical Record Type: Conference Paper Abstract: TE/sub 01/ filters using dielectric ring resonators were both synthesized and analyzed using a full-wave approach. Only 1/8 of a circular waveguide was used to suppress spurious responses. The response of the filters investigated are shown to satisfy the original specifications. The numerical solution reaches convergence with 6 basis functions (6 Refs.) Descriptor(s): band-pass filters; circular waveguides; dielectric resonator filters; frequency response; microwave filters; passive filters; Q-factor; S-parameters Identifier: full-wave design; full-wave analysis; bandpass filters; 1/8-cut high-Q resonators; dielectric ring resonators; TE/sub 01/ filters; circular waveguide; spurious responses suppression; filter response Class Code: B1320 (Waveguide components); B1270D (Passive filters and other passive networks) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 108 Copyright: Copyright 1999, FIZ Karlsruhe Accession No: 6348691 INSPEC Abstract No: B1999-10-2890-003 Author(s): Aknin, N.; El Moussaoui, A.; Iben Yaich, M.; Essaaidi, M. Corp Source: Dept. of Phys., Abdelmalek Essaadi Univ., Tetuan, Morocco Title: Uniaxial bi-anisotropic dielectric ring resonators analysis using the mode matching method Source: European Physical Journal, Applied Physics, vol.6, no.2 p. 189-93 ISSN: 1286-0042 CODEN: EPAPFV Publication: France Language: English Publisher: EDP Sciences Year: 1999 Treatment: T Theoretical or Mathematical; P Practical Record Type: Journal Paper Abstract: In this paper, dielectric bi-anisotropic effects on the resonant frequencies of dielectric ring resonators (DRR) are studied in depth. The resulting electromagnetic boundary problem is solved numerically using the mode matching method (MM). In order to validate this numerical model, the obtained results are compared with those of the literature for a uniaxial electric anisotropic dielectric ring resonator (15 Refs.) Descriptor(s): boundary-value problems; cavity resonators; dielectric resonator oscillators; electromagnetic oscillations; Maxwell equations; microwave oscillators; mode matching; numerical analysis Identifier: dielectric resonators; ring resonators; uniaxial bi-anisotropic resonators; electromagnetic field analysis; mode matching method; resonant frequencies; electromagnetic boundary problem; numerical solution; literature data; Maxwell equations Class Code: B2890 (Other dielectric applications and devices); B5240D (Waveguide and cavity theory); B1320 (Waveguide components) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Copyright: Copyright 1999, IEE Accession No: 6294585 INSPEC Abstract No: B1999-08-1320-015 Author(s): Gentili, G.G.; Macchiarella, G.; Rohrer, F. Corp Source: Dipt. di Elettronica, Politecnico di Milano, Italy Title: A mixed numerical technique for fast computation of hybrid modes resonant frequencies in ring-shaped dielectric-loaded resonators Source: 28th European Microwave Conference Proceedings p. 2 vol. (viii+750+789), 716-20 vol.1 Publication: UK ISBN: 0862131413 Language: English Publisher: Miller Freeman UK; London, UK Conference: 28th European Microwave Conference Proceedings Conference Loc: Amsterdam, Netherlands; 6-8 Oct. 1998 Year: 1998 Treatment: T Theoretical or Mathematical Record Type: Conference Paper Abstract: This paper presents an original approach to the computation of hybrid modes resonant frequencies of dielectric ring resonators in a cylindrical cavity. The method employs both 1-D FEM and mode-matching for evaluating the generalized scattering matrix at the discontinuity between a dielectric-loaded waveguide and an empty waveguide; by suitably manipulating this matrix, a generalized admittance (or impedance) matrix characterizing the resonator is derived: resonant frequencies are then obtained by looking for the zeros of the determinant of these matrices. The paper also reports examples of normalized design charts for the first hybrid mode (HE/sub 11//sup h/) which have been realized using the proposed technique (4 Refs.) Descriptor(s): cavity resonators; dielectric resonators; dielectric-loaded waveguides; eigenvalues and eigenfunctions; finite element analysis; impedance matrix; mode matching; S-matrix theory Identifier: mixed numerical technique; fast computation; hybrid modes resonant frequencies; ring-shaped dielectric-loaded resonators; cylindrical cavity; 1D FEM; mode-matching; generalized scattering matrix; discontinuity; generalized admittance matrix; generalized impedance matrix Class Code: B1320 (Waveguide components); B2890 (Other dielectric applications and devices); B5240D (Waveguide and cavity theory); B0290T (Finite element analysis); B0290H (Linear algebra) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Copyright: Copyright 1999, IEE Accession No: 6195897 INSPEC Abstract No: B1999-04-7310N-024 Author(s): Krupka, J.; Rogowski, J.; Baker-Jarvis, J.; Geyer, R.G. Corp Source: Warsaw Univ. of Technol., Poland Title: Scalar permeability measurements of microwave ferrites using lumped circuit, coaxial line, and resonance techniques Source: 12th International Conference on Microwaves and Radar. MIKON-98. Conference Proceedings (IEEE Cat. No.98EX195) p. 4 vol. (xxiv+xviii+885+362), 701-4 vol.3 Publication: Poland ISBN: 8390666200 Language: English Publisher: Telecommun. Res. Inst; Warsaw, Poland Sponsor: IEEE, MTT; AES; ED Soc.; AES/AP/MTT Joint Chapter of the IEEE Poland Sect Conference: 12th International Conference on Microwaves and Radar. MIKON-98 (IEEE Cat. No.98EX195) Conference Loc: Krakow, Poland; 20-22 May 1998 Year: 1998 Treatment: P Practical; X Experimental Record Type: Conference Paper Abstract: Complex scalar permeability measurement results of microwave ferrites at frequencies from 1 Hz to 20 GHz are presented. Three different techniques were used to perform the measurements. The method chosen depended on frequency and magnetic loss. At low frequencies, 1-10/sup 5/ Hz, we applied lumped parameter circuit techniques. With this technique nonlinear permeability effects were measured. At higher frequencies, from 1 MHz up to gyromagnetic resonance, coaxial transmission line techniques were used. At frequencies above gyromagnetic resonance, a dielectric ring resonator technique was used. By combining all three methods, the real and imaginary parts of sample permeability, with magnetic loss factors that vary from 10/sup -5/ to 10/sup 2/, may be measured. In addition, nonlinear effects in ferrite materials and saturation magnetization may be evaluated (4 Refs.) Descriptor(s): coaxial waveguides; dielectric resonators; ferrites; magnetic leakage; magnetic permeability measurement; magnetisation; microwave materials; microwave measurement Identifier: scalar permeability measurements; microwave ferrites; lumped circuit; coaxial line; resonance techniques; magnetic loss; nonlinear permeability effects; gyromagnetic resonance; dielectric ring resonator; nonlinear effects; saturation magnetization; 1 Hz to 20 GHz Class Code: B7310N (Microwave measurement techniques); B7310L (Magnetic variables measurement); B1305; B1320 (Waveguide components); B3110E (Ferrites and garnets) Numerical Ind: frequency 1.0 E+00 to 2.0 E+10 Hz -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: Check the catalogs in your library. Libraries that Own Item: 161 Copyright: Copyright 1999, IEE Accession No: 6158859 INSPEC Abstract No: B1999-03-7320X-002 Author(s): Okamura, S.; Miyagaki, S.; Ma, Z. Corp Source: Dept. of Electr. & Electron. Eng., Shizuoka Univ., Hamamatsu, Japan Title: Accurate resonance frequency detection in a microwave moisture measurement Source: Journal of Microwave Power and Electromagnetic Energy, vol.33, no.3 p. 143-50 ISSN: 0832-7823 CODEN: JMPEE4 Publication: USA Language: English Publisher: Int. Microwave Power Inst Year: 1998 Treatment: T Theoretical or Mathematical; X Experimental Record Type: Journal Paper Abstract: This paper describes a technique for accurate resonance frequency detection of a moisture measurement system using a dielectric ring resonator operating at a center frequency of about 2.1 GHz by eliminating the influence of noise superimposing on the resonant curve. The curve fitting midpoint method is the most effective one among the three methods examined in this study. The cardboard samples with about 5 to 115% moisture on a dry basis were measured using the curve fitting midpoint method. The standard deviation of the predicted moisture contents is 1.14% (d.b.) over the whole range of moisture contents measured (13 Refs.) Descriptor(s): curve fitting; microwave measurement; moisture; moisture measurement; resonance Identifier: microwave moisture measurement; accurate resonance frequency detection; dielectric ring resonator; curve fitting midpoint method; cardboard samples; moisture content; 2.1 GHz Class Code: B7320X; B7310N (Microwave measurement techniques); B0290F (Interpolation and function approximation) Numerical Ind: frequency 2.1 E+09 Hz -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Copyright: Copyright 1999, IEE Accession No: 6154293 INSPEC Abstract No: B1999-03-1320-025 Author(s): Langham, C.D.; Abbas, F.; Gallop, J.C. Editor: Nelson, T.L. Corp Source: Nat. Phys. Lab., Teddington, UK Title: Observation of "whispering gallery" modes in dielectric rod resonators Source: 1998 Conference on Precision Electromagnetic Measurements Digest (Cat. No.98CH36254) p. xlvi+659, 526-7 Publication: USA ISBN: 0780350189 Language: English Publisher: IEEE; New York, NY, USA Sponsor: Bureau Int. des Poids et Mesures; IEEE Instrum. & Meas. Soc.; NIST; Nat. Res. Council of Canada; URSI; American Assoc. Lab. Accreditation; Andeen-Hagerling; APS Instrum. & Meas. Sci. Topical Group; APS Precision Meas. & Fundamental Constants; Baltimore Gas & Electr.; Cal Lab Magazine; Clarke-Hess Commun. Res. Corp.; Creative Marketing Associates; Fluke Corp.; Guildline Instrum.; Hewlett-Packard Company: Instrum. Support Solutions Div.; IEEE Instrum. & Meas. Soc., Washington Chapter; IEEE Nat. Capital Area Council; Nat. Conference of Stand. Lab.; Organ. American States; Wavetek Corp Conference: Proceedings of Conference on Precision Electromagnetic: Measurements Conference Loc: Washington, DC, USA; 6-10 July 1998 Year: 1998 Treatment: X Experimental Record Type: Conference Paper Abstract: We show some preliminary observations of "whispering gallery" modes in a sapphire rod 100 mm long and 20 mm in diameter. Traditionally dielectric ring resonators or short squat resonators (D/L>or=1) have been used for the observation of such modes. Results of an oscillator employing these whispering gallery modes will also be given in this paper (5 Refs.) Descriptor(s): dielectric resonator oscillators; frequency stability; microwave measurement; mode matching; Q-factor; sapphire Identifier: whispering gallery modes; sapphire rod; dielectric rod resonators; single crystal rods; low order modes; frequency stability; EM standing wave confinement; Q-factors; Allan variance; reduced microwave coupling; 100 mm; 20 mm; Al/sub 2/O/sub 3/ Class Code: B1320 (Waveguide components); B2890 (Other dielectric applications and devices); B7310N (Microwave measurement techniques) Chemical Indx: Al2O3/bin Al2/bin Al/bin O3/bin O/bin Numerical Ind: size 1.0 E-01 m; size 2.0 E-02 m -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 458 Copyright: Copyright 1998, IEE Accession No: 5981763 INSPEC Abstract No: B9809-5240D-005 Author(s): Pereda, J.A.; Del Rio, J.E.F.; Wysocka-Schillak, F.; Prieto, A.; Vegas, A. Corp Source: Dept. de Ingenieria de Comunicaciones, Cantabria Univ., Santander, Spain Title: On the use of linear-prediction techniques to improve the computational efficiency of the FDTD method for the analysis of resonant structures Source: IEEE Transactions on Microwave Theory and Techniques, vol.46, no.7 p. 1027-32 ISSN: 0018-9480 CODEN: IETMAB Publication: USA Language: English Publisher: IEEE Year: July 1998 Copyright No: 0018-9480/98/$10.00 Treatment: T Theoretical or Mathematical Record Type: Journal Paper Abstract: Linear-prediction (LP) techniques are used to accurately and efficiently compute the frequencies and damping factors of microwave resonant structures from their transient response, which was previously obtained by using the finite-difference time-domain (FDTD) method. The LP equations are formulated in terms of a total least squares (TLS) problem and are solved by using the singular-value decomposition (SVD) algorithm. This approach confers robustness to the LP method, improves the spectral resolution, and provides a simple criterion for selecting the order of the LP model. We illustrate these characteristics of the LP method by applying it to two types of problems: the determination of the propagation constants of waveguides loaded with lossy dielectrics, and the calculation of the resonant frequencies of cylindrical cavities loaded with dielectric ring resonators (15 Refs.) Descriptor(s): cavity resonators; dielectric resonators; dielectric-loaded waveguides; finite difference time-domain analysis; least squares approximations; prediction theory; singular value decomposition; waveguide theory Identifier: linear prediction technique; computational efficiency; FDTD method; resonant frequency; damping factor; microwave resonant structure; transient response; total least squares method; singular value decomposition algorithm; propagation constant; lossy dielectric loaded waveguide; dielectric ring resonator loaded cylindrical cavity Class Code: B5240D (Waveguide and cavity theory); B0290Z (Other numerical methods) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 164 Copyright: Copyright 1998, IEE Accession No: 5914344 INSPEC Abstract No: B9806-5260-007 C9806-7410-017 Author(s): Ratner, I.; Ali, H.; Petriu, E.M. Corp Source: Dept. of Electr. Eng., Ottawa Univ., Ont., Canada Title: Neural network simulation of a dielectric ring resonator antenna Source: Journal of Systems Architecture, vol.44, no.8 p. 569-81 ISSN: 1383-7621 CODEN: JSARFB Publication: Netherlands Language: English Publisher: Elsevier Year: April 1998 Copyright No: 1383-7621/98/$19.00 Treatment: P Practical; T Theoretical or Mathematical Record Type: Journal Paper Abstract: Discusses the application of neural network (NN) techniques in the modelling of an electromagnetic (EM) field problem consisting of a dielectric ring resonator antenna. The NN takes into consideration the geometrical and material parameters of the antenna, and the input reflection coefficient values for different frequencies in the bandwidth of interest. The NN is trained off-line using results obtained with the finite element method (FEM). The NN is considered as a nonlinear function approximator and the Levenberg-Marquardt algorithm is used to solve the corresponding least-squares optimization problem. The NN approach is found to provide a tremendous computational speed improvement as well as computer memory reduction compared to the traditional numerical methods of analysis (21 Refs.) Descriptor(s): antenna theory; backpropagation; dielectric resonators; electromagnetic field theory; finite element analysis; function approximation; least squares approximations; Maxwell equations; multilayer perceptrons Identifier: neural network simulation; dielectric ring resonator antenna; electromagnetic field problem; input reflection coefficient; nonlinear function approximator; Levenberg-Marquardt algorithm; least-squares optimization problem; computer memory reduction; computational speed Class Code: B5260 (Antenna theory); B0290F (Interpolation and function approximation); B0290T (Finite element analysis); B2890 (Other dielectric applications and devices); B5270B (Single antennas); C7410 (Electrical engineering computing); C4130 (Interpolation and function approximation); C5290 (Neural computing techniques); C4185 (Finite element analysis) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 442 Copyright: Copyright 1997, IEE Accession No: 5734930 INSPEC Abstract No: A9723-0765-015 Author(s): Borbat, P.P.; Crepeau, R.H.; Freed, J.H. Corp Source: Baker Lab. of Chem., Cornell Univ., Ithaca, NY, USA Title: Multifrequency two-dimensional Fourier transform ESR: an X/Ku-Band spectrometer Source: Journal of Magnetic Resonance, vol.127, no.2 p. 155-67 ISSN: 1090-7807 CODEN: JOMRA4 Publication: USA Language: English Publisher: Academic Press Year: Aug. 1997 Copyright No: 1090-7807/97/$25.00 Treatment: P Practical; X Experimental Record Type: Journal Paper Abstract: A two-dimensional Fourier Transform ESR (2D FT ESR) spectrometer operating at 9.25 and 17.35 GHz is described. The Ku-band bridge uses an efficient heterodyne technique wherein 9.25 GHz is the intermediate frequency. At Ku-band the sensitivity is increased by almost an order of magnitude. One may routinely collect a full 2D ELDOR spectrum in less than 20 min for a sample containing 0.5-5 nmol of nitroxide spin-probe in the slow-motional regime. Broad spectral coverage at Ku-band is obtained by use of a bridged loop-gap resonator (BLGR) and of a dielectric ring resonator (DR). It is shown that an even more uniform spectral excitation is obtained by using shorter microwave pulses of about 3 ns duration. The dead-time at Ku-band is just 30-40 ns, yielding an improved SNR in 2D ELDOR spectra of nitroxide spin-probes with T/sub 2/ as short as 20-30 ns. A comparison of 2D ELDOR spectra obtained at 9.25 and 17.35 GHz for spin-labeled phospholipid probes (16PC) in 1,2-dimyristoyl-sn-glycero-3-phosphoglycerol (DMPG) membrane vesicles showed that both spectra could be satisfactorily simulated using the same set of model parameters even though they are markedly different in appearance. The improved sensitivity and shorter dead-time at Ku-band made it possible to obtain orientation-dependent 2D ELDOR spectra of the Cholestane (CSL) spin-probe in macroscopically aligned lipid bilayers of egg yolk PC using samples containing only 1 mg of lipid and just 5 nmol of spin probe (38 Refs.) Descriptor(s): biomembranes; EPR spectrometers; Fourier transform spectrometers; lipid bilayers; two-dimensional spectroscopy Identifier: multifrequency two-dimensional Fourier transform ESR; X-Band spectrometer; Ku-Band spectrometer; Ku-band bridge; heterodyne technique; intermediate frequency; full 2D ELDOR spectrum; slow-motional regime; bridged loop-gap resonator; broad spectral coverage; sensitivity; dielectric ring resonator; microwave pulses; dead-time; 2D ELDOR spectra; spin-labeled phospholipid probe; 1,2-dimyristoyl-sn-glycero-3-phosphoglycerol membrane vesicles; orientation-dependent 2D ELDOR spectra; cholestane spin-probe; macroscopically aligned lipid bilayers; egg yolk; 9.25 GHz; 17.35 GHz Class Code: A0765 (Optical spectroscopy and spectrometers); A8720 (Membrane biophysics) Numerical Ind: frequency 9.25 E+09 Hz; frequency 1.735 E+10 Hz -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Copyright: Copyright 1997, IEE Accession No: 5483675 INSPEC Abstract No: B9703-3120G-001 Author(s): Geyer, R.G.; Krupka, J. Editor: Braun, A. Corp Source: Nat. Inst. of Stand. & Technol., Boulder, CO, USA Title: Microwave behavior of ferrites: theory and experiment Source: 1996 Conference on Precision Electromagnetic Measurements Digest (Cat. No.96CH35956) p. xxxvi+646+26 suppl., 206-7 Publication: USA ISBN: 0780333764 Language: English Publisher: IEEE; New York, NY, USA Sponsor: Bureau Int. Poids & Mes.; IEEE Instrum. & Meas. Soc.; NIST; NRCC; URSI; Bundesminist. Bildung, Wissenschaft, Forschung & Technol.; Bundesminist. Wirtschaft; Deutsche Forschungsgemeinschaft; Fluke Corp.; Helmholtz Fonds e.V.; Hewlett-Packard; IUPAP; Phys.-Tech. Bundesanstalt; Siemens; Stadt Braunschweig; Wavetek; WE-Heraeus-Stiftung Conference: Proceedings of 20th Biennial Conference on Precision Electromagnetic Measurements Conference Loc: Braunschweig, Germany; 17-21 June 1996 Year: 1996 Treatment: P Practical; X Experimental Record Type: Conference Paper Abstract: The relative magnetic permeability and loss factor of microwave ferrites in the demagnetized state are determined near and above gyromagnetic resonance using low-loss dielectric ring resonators. This technique allows complex permeability determination on a single ferrite sample from 2 GHz to 25 GHz. The measured real parts of the initial permeability are compared with theoretical predictions of the permeability of a sample in the demagnetized state (3 Refs.) Descriptor(s): demagnetisation; dielectric resonators; ferrite circulators; ferrite phase shifters; ferrites; loss measurement; magnetic leakage; magnetic permeability measurement; microwave circulators; microwave measurement; microwave phase shifters Identifier: microwave behavior; microwave ferrites; relative magnetic permeability; relative magnetic loss factor; demagnetized state; gyromagnetic resonance; low-loss dielectric ring resonators; complex permeability determination; initial permeability; accurate measurement; Q factor; single ferrite sample; circulators; phase shifters; 2 to 25 GHz Class Code: B3120G (Microwave magnetic devices); B3110E (Ferrites and garnets); B7310L (Magnetic variables measurement); B7310H (Phase and gain measurement); B7310N (Microwave measurement techniques); B1320 (Waveguide components) Numerical Ind: frequency 2.0 E+09 to 2.5 E+10 Hz -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Copyright: Copyright 1996, IEE Accession No: 5398955 INSPEC Abstract No: B9611-5260-011 C9611-7410-031 Author(s): Ratner, I.; Ali, H.O.; Petriu, E.M.; Eatherley, G. Corp Source: Ottawa Univ., Ont., Canada Title: Neural network modelling of electromagnetic field problems Source: Proceedings International Workshop on Neural Networks for Identification, Control, Robotics, and Signal/Image Processing (Cat. No.96TB100029) p. xi+486, 387-91 Publication: USA ISBN: 0818674563 Language: English Publisher: IEEE Comput. Soc. Press; Los Alamitos, CA, USA Sponsor: IEEE Comput. Soc.; IEEE Comput. Soc. Tech. Committee on Pattern Anal. & Machine Intelligence (PAM); ACM SIGART; IEEE Circuits & Syst. Soc.; IEEE Control Syst. Soc.; IEEE Instrum. & Meas. Soc.; IEEE Neural Networks Council; IEEE North-Italy Sect.; IEEE Region 8; IEEE Syst., Man, & Cybernetics Soc.; IMACS; ISCA; AEL; AICA; ANIPLA; FAST Conference: Proceedings of International Workshop on Neural Networks for Identification, Control, Robotics and Signal/Image Processing Conference Loc: Venice, Italy; 21-23 Aug. 1996 Year: 1996 Copyright No: 0 8186 7456 3/96/$5.00 Treatment: T Theoretical or Mathematical; X Experimental Record Type: Conference Paper Abstract: This paper discusses the application of neural network (NN) technique in the modelling of a typical electromagnetic (EM) field problem consisting of a coaxially-driven dielectric-ring resonator antenna. The NN takes into consideration the geometrical and material parameters of the EM model, and the reflection coefficient values for different frequencies in the bandwidth of interest. The NN is trained off-line using the training sets generated by the finite element method. Once an acceptable NN model is found by simulation it can be implemented in hardware in order to provide the real time behaviour requested for further integration in an EM-CAD tool (5 Refs.) Descriptor(s): antenna theory; dielectric resonators; electromagnetic fields; feedforward neural nets; finite element analysis; Maxwell equations; modelling Identifier: neural network modelling; electromagnetic field; dielectric-ring resonator antenna; reflection coefficient; finite element method; EM CAD tool; EM field model; feedforward neural network Class Code: B5260 (Antenna theory); B5210 (Electromagnetic wave propagation); B0290T (Finite element analysis); B5270B (Single antennas); C7410 (Electrical engineering computing); C1220 (Simulation, modelling and identification); C5290 (Neural computing techniques); C4185 (Finite element analysis) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 442 Copyright: Copyright 1996, IEE Accession No: 5277237 INSPEC Abstract No: B9607-3110E-001 Author(s): Krupka, J.; Geyer, R.G. Corp Source: Instytut Mikroelektroniki i Optoelektroniki, Warsaw Poly., Poland Title: Complex permeability of demagnetized microwave ferrites near and above gyromagnetic resonance Source: IEEE Transactions on Magnetics, vol.32, no.3, pt.2 p. 1924-33 ISSN: 0018-9464 CODEN: IEMGAQ Publication: USA Language: English Publisher: IEEE Year: May 1996 Copyright No: 0018-9464/96/$05.00 Treatment: X Experimental Record Type: Journal Paper Abstract: A wide variety of microwave ferrite phase-shifting materials have been measured in the demagnetized state. The relative magnetic permeability and loss factor were determined near and above natural gyromagnetic resonance using H/sub 011/ cylindrical dielectric ring resonators. These low-loss dielectric sleeves were dimensioned for accurate magnetic property measurements of single ferrite rod samples at logarithmically sampled resonant frequencies from 2 GHz to 25 GHz. Permeability and magnetic loss factor are computed from the measured resonant frequencies and Q factors of these resonators, with and without the ferrite sample, using exact eigenvalue equations. Generally, the real part of the complex magnetic permeability increases with decreasing saturation magnetization, while the magnetic loss factor increases nonlinearly with increasing saturation. Schloemann's theoretical model for the real part of initial permeability of a cylindrically symmetric domain configuration in the completely demagnetized state shows excellent agreement with measured data when 2 pi gamma mu /sub s// omega <0.75. The data allow design optimization of circulators and dual-mode and polarization-insensitive phasers, which are widely used in antenna array systems (37 Refs.) Descriptor(s): demagnetisation; dielectric resonators; ferrite phase shifters; gyromagnetic effect; magnetic microwave devices; magnetic permeability; magnetic resonance Identifier: demagnetized microwave ferrites; gyromagnetic resonance; phase-shifting materials; magnetic permeability; magnetic loss factor; cylindrical dielectric ring resonators; Q factor; saturation magnetization; 2 to 25 GHz Class Code: B3110E (Ferrites and garnets); B1350F (Solid-state microwave circuits and devices); B3120G (Microwave magnetic devices) Numerical Ind: frequency 2.0 E+09 to 2.5 E+10 Hz -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 20 Copyright: Copyright 1996, IEE Accession No: 5217559 INSPEC Abstract No: B9605-1350-003 Author(s): Katok, V.B.; Manko, A.A. Title: Filters based on traveling-wave dielectric resonators Source: Radiotekhnika ISSN: 0033-8486 CODEN: RATEAO Publication: Russia Translated In: Telecommunications and Radio Engineering, Part 2 (Radio Engineering), vol.49, no.7 p. 73-7 ISSN: 0040-2508 CODEN: TCREAG Country: USA Language: English Publisher: Scripta Technica Year: July 1995 Copyright No: 0040-2508/95/0007-0073 Treatment: P Practical; T Theoretical or Mathematical Record Type: Journal Paper Abstract: The purpose of this paper is to investigate numerically and experimentally the characteristics of single-resonator filters in the form of a construction containing a metal base on which a dielectric ring resonator (DRR), made using a rectangular dielectric waveguide (RDW), and two RDW segments joined at diametrically opposite points to the DRR are mounted (6 Refs.) Descriptor(s): dielectric resonators; dielectric waveguides; microwave filters; rectangular waveguides; resonator filters; waveguide theory Identifier: traveling-wave dielectric resonators; numerical calculation method; microwave filters; standing-wave dielectric ring resonators; rectangular dielectric waveguide; RDW segments; metal base Class Code: B1350 (Microwave circuits and devices); B1270D (Passive filters and other passive networks); B2890 (Other dielectric applications and devices); B1320 (Waveguide components); B5240D (Waveguide and cavity theory) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Copyright: Copyright 1995, IEE Accession No: 5038246 INSPEC Abstract No: B9510-1320-036 Author(s): Sun, S.-Y.; Wu, L.; Fen, L.-M. Corp Source: Dept. of Electron. Eng., Shanghai Jiao Tong Univ., China Title: Precise computation of the resonant frequency of the ring dielectric resonators Source: APMC '93. 1993 Asia-Pacific Microwave Conference Proceedings (Cat. No.93TH0566-0) p. 2 vol. (1175+11 addendum), 5/85-8 vol.1 Publication: USA ISBN: 0780313526 Language: English Publisher: IEEE; New York, NY, USA Conference: Proceedings of 1993 Asia Pacific Microwave Conference (APMC'93) Conference Loc: Hsinchu, Taiwan; 18-21 Oct. 1993 Year: 1993 Treatment: T Theoretical or Mathematical Record Type: Conference Paper Abstract: The authors deduce the characteristic equations of dielectric ring resonator using the open waveguide method. Through solving these equations, they compute the frequencies of TE/sub 01/ delta and TM/sub 01/ delta mode. The authors also analyze the influence of dielectric material both inside and outside the ring on the resonant frequency. Thus, they can explain the adjustability of the frequency of the TM mode over a wide range (2 Refs.) Descriptor(s): dielectric resonators; waveguide theory Identifier: TE/sub 01 delta / mode; resonant frequency; ring dielectric resonators; characteristic equations; open waveguide method; TM/sub 01/ delta mode; dielectric material; TM mode Class Code: B1320 (Waveguide components); B2890 (Other dielectric applications and devices) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Copyright: Copyright 1995, IEE Accession No: 4986077 INSPEC Abstract No: B9508-5270-023 Author(s): Shum, S.M.; Luk, K.M. Corp Source: Dept. of Electron. Eng., City Polytech. of Hong Kong, Kowloon, Hong Kong Title: Bandwidth enhancement of probe-fed dielectric ring resonator antenna with parasitic element Source: IEEE Antennas and Propagation Society International Symposium 1994. IEEE. 1994 International Symposium Digest Antennas and Propagation (Cat. No.94CH3466-0) p. 3 vol. x+2357, 768-71 vol.2 Publication: USA ISBN: 0780320093 Language: English Publisher: IEEE; New York, NY, USA Conference: Proceedings of IEEE Antennas and Propagation Society International Symposium and URSI National Radio Science Meeting Conference Loc: Seattle, WA, USA; 20-24 June 1994 Year: 1994 Copyright No: 0 7803 2009 3/94/$4.00 Treatment: T Theoretical or Mathematical; X Experimental Record Type: Conference Paper Abstract: Dielectric resonators (DR) find application in the design of microwave antennas. The radiation patterns of DR antennas are related to their excited resonant model(s). Dielectric resonators of low dielectric constant are usually employed to give a reasonable impedance bandwidth. We demonstrate that the bandwidth of a center probe-fed cylindrical dielectric ring resonator antenna can be increased by stacking another DR of the same dimensions on the top of the fed DR. The return loss and the radiation patterns of the stacked DR antenna are computed using the finite difference time-domain (FD-TD) method. The numerical results so obtained are compared to experimental measurements (6 Refs.) Descriptor(s): antenna feeds; antenna radiation patterns; dielectric resonators; electric impedance; finite difference time-domain analysis; losses; microwave antennas; probes Identifier: probe-fed dielectric ring resonator antenna; parasitic element; bandwidth enhancement; microwave antennas; radiation patterns; excited resonant model; low dielectric constant; impedance bandwidth; cylindrical dielectric ring antenna; return loss; stacked DR antenna; finite difference time-domain; FDTD method; numerical results; experimental measurements; cylindrical antenna Class Code: B5270 (Antennas); B5260 (Antenna theory); B0290Z (Other numerical methods) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Copyright: Copyright 1995, IEE Accession No: 4928452 INSPEC Abstract No: B9505-1350F-025 Author(s): Ivanov, E.N.; Kalinichev, V.I.; Blair, D.G. Corp Source: Dept. of Phys., Western Australia Univ., Nedlands, WA, Australia Title: Sapphire loaded microwave resonators with enhanced quality factor Source: Proceedings of the 1994 IEEE International Frequency Control Symposium (The 48th Annual Symposium) (Cat. No.94CH3446-2) p. xvii+817, 500-5 Publication: USA ISBN: 0780319451 Language: English Publisher: IEEE; New York, NY, USA Sponsor: IEEE Ultrasonics, Ferroelectr. & Frequency Control Soc Conference: Proceedings of IEEE 48th Annual Symposium on Frequency Control Conference Loc: Boston, MA, USA; 1-3 June 1994 Year: 1994 Copyright No: 0 7803 1945 1/94/$3.00 Treatment: T Theoretical or Mathematical Record Type: Conference Paper Abstract: This paper describes the properties of two-dimensional shielded dielectric ring resonators consisting of a few coaxial dielectric layers surrounded by the coaxial metal shield. It is shown that the Q factor of such resonators excited in whispering-gallery modes increases with azimuthal mode number due to the effective concentration of electromagnetic energy outside the dielectric in the inner region of the resonator as well as in the gap between the dielectric layers. At moderately high azimuthal numbers (m=15...25) the Q-factor can significantly (2 to 3 times) exceed the limit imposed by the intrinsic losses in the dielectric (11 Refs.) Descriptor(s): dielectric resonators; frequency stability; microwave oscillators; numerical analysis; Q-factor; sapphire Identifier: sapphire loaded microwave resonators; enhanced quality factor; two-dimensional shielded dielectric ring resonators; coaxial dielectric layers; coaxial metal shield; whispering-gallery modes; azimuthal mode number; Q-factor; intrinsic losses; numerical analysis Class Code: B1350F (Solid-state microwave circuits and devices); B2890 (Other dielectric applications and devices); B0290Z (Other numerical methods) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 458 Accession No: 4644641 INSPEC Abstract No: B9405-1320-009 Author(s): Santiago, D.G.; Dick, G.J.; Prata, A., Jr Corp Source: Jet Propulsion Lab., Pasadena, CA, USA Title: Mode control of cryogenic whispering-gallery mode sapphire dielectric-ring resonators Source: IEEE Transactions on Microwave Theory and Techniques, vol.42, no.1 p. 52-5 ISSN: 0018-9480 CODEN: IETMAB Publication: USA Language: English Year: Jan. 1994 Copyright No: 0018-9480/94/$04.00 Treatment: P Practical; T Theoretical or Mathematical; X Experimental Record Type: Journal Paper Abstract: This paper presents a technique for solving the mode purity problem that exists in cryogenic microwave frequency discriminators using X-band sapphire whispering-gallery mode resonators. The sapphire cavity resonates in a pair of quasi-degenerate modes split by a few kHz due to small geometrical imperfections. Since the nature and location of the geometrical imperfections are difficult to determine, variable coupling of the modes to a fixed output port results. Resonator applications require reproducible coupling to only one of these modes. This objective can be achieved by adding a larger dominant perturbation to the resonator. Results of tests show that a noncircularly-symmetric sapphire piece suspended above the resonator can provide controllable mode coupling and simultaneous frequency tuning (4 Refs.) Descriptor(s): cavity resonators; cryogenics; dielectric resonators; microwave devices; sapphire; tuning Identifier: mode control; cryogenic microwave frequency discriminators; whispering-gallery mode; sapphire dielectric-ring resonators; X-band; sapphire cavity; dominant perturbation; noncircularly-symmetric sapphire piece; controllable mode coupling; frequency tuning; WGM; SHF; Al/sub 2/O/sub 3/ Class Code: B1320 (Waveguide components); B2890 (Other dielectric applications and devices) Chemical Indx: Al2O3/bin Al2/bin Al/bin O3/bin O/bin -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 340 Accession No: 4638090 INSPEC Abstract No: B9405-5270B-019 Author(s): Shum, S.M.; Luk, K.M. Corp Source: Dept. of Electron. Eng., City Polytech. of Hong Kong, Kowloon, Hong Kong Title: Characteristics of dielectric ring resonator antenna with an air gap Source: Electronics Letters, vol.30, no.4 p. 277-8 ISSN: 0013-5194 CODEN: ELLEAK Publication: UK Language: English Year: 17 Feb. 1994 Copyright No: 0013-5194/94/$7.50+0.00 Treatment: T Theoretical or Mathematical Record Type: Journal Paper Abstract: The characteristics of centre probe-fed cylindrical dielectric ring resonator antennas with an air gap are studied both theoretically and experimentally. The return loss of the TM/sub 01 delta / mode is evaluated by using the finite-difference time-domain (FDTD) method and the result agrees well with the measured data. It is demonstrated that the impedance bandwidth can be improved by adjusting the air-gap spacing (6 Refs.) Descriptor(s): antenna theory; dielectric resonators; losses; microwave antennas Identifier: dielectric ring resonator antenna; microwave antenna; centre probe-fed cylindrical resonator antennas; return loss; TM/sub 01 delta / mode; finite-difference time-domain method; FDTD method; impedance bandwidth; air-gap spacing Class Code: B5270B (Single antennas); B5260 (Antenna theory); B2890 (Other dielectric applications and devices) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 845 Accession No: 4557732 INSPEC Abstract No: A9403-7460G-011 Author(s): Yeh, N.-C.; Kriplani, U.; Jiang, W.; Reed, D.S.; Strayer, D.M.; Barner, J.B.; Hunt, B.D.; Foote, M.C.; Vasquez, R.P.; Gupta, A.; Kussmaul, A. Corp Source: Dept. of Phys., California Inst. of Technol., Pasadena, CA, USA Title: Microwave vortex dissipation of superconducting Nd-Ce-Cu-O epitaxial films in high magnetic fields Source: Physical Review B (Condensed Matter), vol.48, no.13 p. 9861-4 ISSN: 0163-1829 CODEN: PRBMDO Publication: USA Language: English Year: 1 Oct. 1993 Copyright No: 0163-1829/93/48(13)/9861(4)/$06.00 Treatment: X Experimental Record Type: Journal Paper Abstract: The microwave vortex dissipation of superconducting Nd/sub 1.85/Ce/sub 0.15/ CuO/sub x/ epitaxial films is investigated by use of a sapphire dielectric-ring resonator in the whispering gallery modes and in DC magnetic fields ranging from 0 to 25 kG. By extending the Coffey-Clem model to the thin-film and finite-grain-size limit, the authors infer important material parameters, including the irreversibility line, vortex pinning potential, pinning force constant and viscosity, through a direct least-squares fit to the microwave-absorption data (27 Refs.) Descriptor(s): cerium compounds; electromagnetic wave absorption; flux pinning; high-temperature superconductors; mixed state; neodymium compounds; superconducting epitaxial layers Identifier: epitaxial films; high magnetic fields; microwave vortex dissipation; sapphire dielectric-ring resonator; whispering gallery modes; Coffey-Clem model; thin-film; finite-grain-size limit; irreversibility line; vortex pinning potential; pinning force constant; viscosity; direct least-squares fit; microwave-absorption data; 0 to 25 kG; superconducting Nd/sub 1.85/Ce/sub 0.15/ CuO/sub x/ Class Code: A7460G (Flux pinning, flux motion, fluxon-defect interactions); A7475 (Superconducting films); A7430G (Response to electromagnetic fields, nuclear magnetic resonance, ultrasonic attenuation); A7470V (Perovskite phase superconductors) Chemical Indx: Nd1.85Ce0.15CuO/ss Ce0.15/ss Nd1.85/ss Ce/ss Cu/ss Nd/ss O/ss Numerical Ind: magnetic flux density 0.0 E+00 to 2.5 E+00 T -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 340 Accession No: 4504792 INSPEC Abstract No: B9312-5270B-002 Author(s): Mongia, R.K.; Ittipiboon, A.; Bhartia, P.; Cuhaci, M. Corp Source: Dept. of Electr. Eng., Ottawa Univ., Ont., Canada Title: Electric-monopole antenna using a dielectric ring resonator Source: Electronics Letters, vol.29, no.17 p. 1530-1 ISSN: 0013-5194 CODEN: ELLEAK Publication: UK Language: English Year: 19 Aug. 1993 Copyright No: 0013-5194/93/$7.50+0.00 Treatment: P Practical; X Experimental Record Type: Journal Paper Abstract: A dielectric ring resonator antenna structure which radiates like an electric monopole is reported. The use of high in /sub r/ resonator material leads to small antenna height. Experiments show that the proposed antenna configuration is potentially useful for constructing small and compact 'electric-monopole' antennas (5 Refs.) Descriptor(s): antenna radiation patterns; dielectric resonators; microwave antennas; monopole antennas Identifier: compact type; ring resonator; electric monopole; antenna configuration Class Code: B5270B (Single antennas); B2890 (Other dielectric applications and devices) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Accession No: 4501919 INSPEC Abstract No: B9311-7320Z-007 Author(s): Masuda, T.; Okamura, S. Corp Source: Fac. of Eng., Shizuoka Univ., Hamamatsu, Japan Title: Resonant frequency analysis of a dielectric ring resonator for a moisture content measurement Source: Transactions of the Institute of Electronics, Information and Communication Engineers C-I, vol.J76C-I, no.6 p. 254-7 CODEN: DTRCEP Publication: Japan Language: Japanese Year: June 1993 Treatment: P Practical; X Experimental Record Type: Journal Paper Abstract: Resonant frequency of a dielectric ring resonator in which an arbitrary dielectric sample is inserted is analyzed considering an air gap between a sample and a dielectric ring. In the former analysis neglecting the gap effect, a noticeable error occurred. The results by this analysis are in accurate agreement with the measured values (4 Refs.) Descriptor(s): dielectric measurement; dielectric resonators; moisture measurement Identifier: resonant frequency analysis; dielectric ring resonator; moisture content measurement; arbitrary dielectric sample; air gap; gap effect Class Code: B7320Z (Other nonelectric variables); B7310K (Dielectric variables) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 186 Accession No: 4397332 INSPEC Abstract No: B9306-2890-001 Author(s): Okamura, S.; Sone, M. Corp Source: Fac. of Eng., Shizuoka Univ., Hamamatsu, Japan Title: Resonant frequency analysis of a dielectric ring resonator for a new method of moisture content measurements Source: Electronics and Communications in Japan, Part 2 (Electronics), vol.75, no.9 p. 63-71 ISSN: 8756-663X CODEN: ECJEEJ Publication: USA Language: English Year: Sept. 1992 Copyright No: 8756-663X/92/0009-0063$7.50/0 Treatment: N New Development; P Practical; T Theoretical or Mathematical; X Experimental Record Type: Journal Paper Abstract: Proposes that the moisture content measurement for small and randomly shaped materials be done by a technique making use of the resonant frequency shift of a dielectric ring resonator. An analysis of the resonant frequency and a possibility of the new measurement method are discussed. First, for taking the correlation of the moisture content with the shift of the resonant frequency of a moist sample within a resonator caused by the change of permittivity, the theoretical value of the resonant frequency was derived by the mode matching method when an arbitrary dielectric sample was placed at the hollow central part of a dielectric ring. A theoretical equation was derived and its validity was confirmed by comparison of the theoretical and experimental values for a known dielectric sample. From the relationship between the shift of the resonant frequency and the permittivity of the sample obtained from the theoretical equation, the shift of the resonant frequency is found usable for measurement of moisture content (15 Refs.) Descriptor(s): dielectric resonators; frequency measurement; microwave measurement; moisture measurement Identifier: dielectric ring resonator; moisture content measurement; randomly shaped materials; resonant frequency shift; change of permittivity; mode matching method Class Code: B2890 (Other dielectric applications and devices); B7320Z (Other nonelectric variables); B7310G (Frequency); B7310N (Microwave techniques) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 351 Accession No: 4313379 INSPEC Abstract No: B9302-1320-011 Author(s): Mongia, R.K.; Bhartia, P. Corp Source: Ottawa Univ., Ont., Canada Title: Easy resonant frequency computations for ring resonators Source: Microwave Journal, vol.35, no.11 p. 105-8 ISSN: 0026-2897 CODEN: MCWJAD Publication: USA Language: English Year: Nov. 1992 Treatment: T Theoretical or Mathematical Record Type: Journal Paper Abstract: Dielectric ring resonators offer advantages over cylindrical resonators (CR) in some practical applications. The authors show that the resonant frequency of the TE/sub 01 delta / mode of a ring resonator can be computed accurately from the resonant frequency of the corresponding CR by using the simple perturbational method (4 Refs.) Descriptor(s): dielectric resonators; perturbation techniques Identifier: resonant frequency computations; ring resonators; TE/sub 01 delta / mode; perturbational method Class Code: B1320 (Waveguide components); B2890 (Other dielectric applications and devices) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: Check the catalogs in your library. Libraries that Own Item: 19 Accession No: 4309376 INSPEC Abstract No: B9302-1320-003 Author(s): Belov, Yu.G.; Kogtev, A.S. Title: A shielded dielectric ring resonator Source: Izvestiya Vysshikh Uchebnykh Zavedenii, Radioelektronika, vol.34, no.11 p. 12-17 ISSN: 0021-3470 CODEN: IVUZB5 Publication: Ukraine Translated In: Radioelectronics and Communication Systems, vol.34, no.11 p. 11-14 ISSN: 0735-2727 CODEN: RCSYDS Country: USA Language: English Year: 1991; 1991 Copyright No: 0735-2727/91/$20.00 Treatment: T Theoretical or Mathematical Record Type: Journal Paper Abstract: A dielectric ring resonator with a spacer and a base in a cylindrical shield, and a dielectric ring resonator tuned with a metal rod, are considered. Computational algorithms are developed by the method of finite regions. Calculated resonant frequencies and Q-factors are reported (5 Refs.) Descriptor(s): dielectric resonators; Q-factor; shielding Identifier: computational algorithms; metal rod tuning; shielded dielectric ring resonator; cylindrical shield; method of finite regions; resonant frequencies; Q-factors Class Code: B1320 (Waveguide components); B5230 (Electromagnetic compatibility and interference); B2890 (Other dielectric applications and devices); B5240D (Waveguide and cavity theory) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Accession No: 4181853 INSPEC Abstract No: B9208-2890-001 Author(s): Okamura, S.; Sone, M. Corp Source: Fac. of Eng., Shizuoka Univ., Hamamatsu, Japan Title: Resonant frequency analysis of a dielectric ring resonator for a new method of moisture content measurements Source: Transactions of the Institute of Electronics, Information and Communication Engineers C-I, vol.J75C-I, no.3 p. 164-70 CODEN: DTRCEP Publication: Japan Language: Japanese Year: March 1992 Treatment: N New Development; P Practical; T Theoretical or Mathematical; X Experimental Record Type: Journal Paper Abstract: An analysis of the resonant frequency of a dielectric ring resonator is described to discuss a new method of moisture content measurement for samples having small or nonuniform size. Using a mode matching method the authors deduced a theoretical equation of the resonant frequency for the resonator having a disk-shaped sample. The correctness of this equation is confirmed from the close agreement between calculated resonant frequency for the samples whose dielectric constant are known and a measured one. The possibility of measuring moisture content only from the resonant frequency measurements is shown theoretically, and is proved by the experiments using cardboard samples (15 Refs.) Descriptor(s): dielectric resonators; moisture measurement Identifier: small samples; resonant frequency analysis; dielectric ring resonator; analysis; moisture content measurement; nonuniform size; mode matching method; theoretical equation; disk-shaped sample; resonant frequency measurements; cardboard samples Class Code: B2890 (Other dielectric applications and devices); B1320 (Waveguide components); B7320Z (Other nonelectric variables) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 458 Accession No: 4108556 INSPEC Abstract No: B9204-1320-026 Author(s): Chen, S.-W.; Zaki, K.A. Corp Source: Comsat Syst. Div., Clarksburg, MD, USA Title: Dielectric ring resonators loaded in waveguide and on substrate Source: IEEE Trans. Microw. Theory Tech. (USA), IEEE Transactions on Microwave Theory and Techniques, vol.39, no.12 p. 2069-76 ISSN: 0018-9480 CODEN: IETMAB Publication: USA Language: English Sponsor: IEEE Conference: 1991 IEEE/MTT-S International Microwave Symposium - MTT '91 Conference Loc: Boston, MA, USA; 10-14 June 1991 Year: Dec. 1991 Copyright No: 0018-9480/91/1200-2069$01.00 Treatment: A Application; T Theoretical or Mathematical; X Experimental Record Type: Conference Paper; Journal Paper Abstract: A rigorous mode matching technique is used to analyze the dielectric ring resonators loaded in a waveguide and on top of a substrate. Variation of several lowest order modes' resonant frequencies as a function of structure parameters is presented and is shown to be helpful for optimization of spurious mode separation. Two-dimensional electric and magnetic field line patterns and three-dimensional field intensity distributions of the ring resonators are plotted and provide information for mode excitation, coupling, and spurious mode suppression. Coupling between two dielectric ring resonators loaded in a metallic cavity are analyzed. The dielectric ring resonators are used to design a C-band elliptic function dual mode bandpass filter employing HE/sub 11/ modes. Experimental results are presented and show excellent agreement with the analytical solutions (7 Refs.) Descriptor(s): band-pass filters; dielectric devices; dielectric-loaded waveguides; microwave filters; passive filters; waveguide theory Identifier: loaded waveguide; 2D electric field patterns; mode coupling; substrate; mode matching technique; dielectric ring resonators; optimization; spurious mode separation; magnetic field line patterns; three-dimensional field intensity distributions; mode excitation; spurious mode suppression; metallic cavity; C-band; elliptic function; dual mode bandpass filter; HE/sub 11/ modes Class Code: B1320 (Waveguide components); B5240D (Waveguide and cavity theory); B1270D (Passive filters and other passive networks); B2890 (Other dielectric applications and devices) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 458 Accession No: 4108555 INSPEC Abstract No: B9204-1320-025 Author(s): Hui, W.K.; Wolff, I. Corp Source: Dept. of Electr. Eng., Duisburg Univ., Germany Title: Dielectric ring-gap resonator for application in MMIC's Source: IEEE Trans. Microw. Theory Tech. (USA), IEEE Transactions on Microwave Theory and Techniques, vol.39, no.12 p. 2061-8 ISSN: 0018-9480 CODEN: IETMAB Publication: USA Language: English Sponsor: IEEE Conference: 1991 IEEE/MTT-S International Microwave Symposium - MTT '91 Conference Loc: Boston, MA, USA; 10-14 June 1991 Year: Dec. 1991 Copyright No: 0018-9480/91/1200-2061$01.00 Treatment: A Application; P Practical; T Theoretical or Mathematical; X Experimental Record Type: Conference Paper; Journal Paper Abstract: A dielectric resonator, the dielectric ring-gap resonator, is introduced and analyzed. The dielectric ring-gap resonator is obtained by sawing a narrow gap into a dielectric resonator. Resonant frequencies and unloaded Q-factors of quasi-TE/sub 0pq/ mode in the ring-gap resonator have been calculated by an appropriate equivalent circuit starting from the resonant frequencies and the field distributions of the TE/sub 0pq/ modes in the ring resonator. The calculated resonant frequencies of the fundamental quasi-TE/sub 011/ mode show an accuracy of <1% compared with the experimental results. Coupling techniques to couple the ring-gap resonator to a microstrip line on a thin substrate, using the electric fringing field near the gap, have been experimentally investigated. A rigorous method for determining resonant frequencies and field distributions of TE modes in a multicomposite multilayered cylindrical resonator is presented. This resonator consists of numbers of cylinders that are arbitrarily layered in the axial direction (7 Refs.) Descriptor(s): dielectric resonators; electric fields; equivalent circuits; magnetic fields; MMIC; Q-factor Identifier: coupling techniques; ring-gap resonator; dielectric resonator; unloaded Q-factors; equivalent circuit; resonant frequencies; field distributions; TE/sub 0pq/ modes; fundamental quasi-TE/sub 011/ mode; electric fringing field; TE modes; multicomposite multilayered cylindrical resonator Class Code: B1320 (Waveguide components); B1350H (Microwave integrated circuits); B2890 (Other dielectric applications and devices) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Accession No: 4086520 INSPEC Abstract No: B9203-1320-043 Author(s): Hui, W.K.; Wolff, I. Corp Source: Dept. of Electr. Eng., Duisburg Univ., Germany Title: Dielectric ring-gap resonator for application in MMIC's Source: 1991 IEEE MTT-S International Microwave Symposium Digest (91CH2870-4) p. 3 vol. (v+xxxvii+xxxvii+1370), 735-8 vol.2 Publication: USA ISBN: 0879425911 Language: English Publisher: IEEE; New York, NY, USA Sponsor: IEEE Conference Loc: Boston, MA, USA; 10-14 June 1991 Year: 1991 Copyright No: CH2870-4/91/0000-0735$01.00 Treatment: A Application; N New Development; P Practical; T Theoretical or Mathematical; X Experimental Record Type: Conference Paper Abstract: A novel dielectric resonator-the dielectric ring-gap resonator- is introduced and analyzed. The resonant frequency and unloaded Q factor of the fundamental quasi-TE/sub 011/ mode have been calculated by a numerical field analysis and an appropriate equivalent circuit. The characteristics of the fundamental quasi-TE/sub 011/ mode in the dielectric ring-gap resonator have been experimentally investigated. New coupling techniques to couple the dielectric ring-gap resonator to, e.g., a microstrip line on a thin substrate, using the electric fringing field near the gap edges have been experimentally investigated (2 Refs.) Descriptor(s): dielectric resonators; equivalent circuits; MMIC; Q-factor Identifier: MMIC; monolithic microwave IC; ring-gap resonator; resonant frequency; unloaded Q factor; fundamental quasi-TE/sub 011/ mode; numerical field analysis; equivalent circuit; microstrip line Class Code: B1320 (Waveguide components); B1350H (Microwave integrated circuits); B2890 (Other dielectric applications and devices) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Accession No: 4086519 INSPEC Abstract No: B9203-5240D-024 Author(s): Chen, S.-W.; Zaki, K.A. Corp Source: COMSAT Syst. Div., Clarksburg, MD, USA Title: A rigorous analysis of dielectric ring resonators loaded in waveguide or microstrip line structure Source: 1991 IEEE MTT-S International Microwave Symposium Digest (91CH2870-4) p. 3 vol. (v+xxxvii+xxxvii+1370), 731-4 vol.2 Publication: USA ISBN: 0879425911 Language: English Publisher: IEEE; New York, NY, USA Sponsor: IEEE Conference Loc: Boston, MA, USA; 10-14 June 1991 Year: 1991 Copyright No: CH2870-4/91/0000-0731$01.00 Treatment: T Theoretical or Mathematical Record Type: Conference Paper Abstract: A rigorous mode matching technique is used to analyze dielectric ring resonators loaded in a waveguide or microstrip line structure. Variations of the resonant frequencies for several lowest order modes with the structures' parameters are presented. Analysis shows that increasing the inner concentric hole diameter changes the TE/sub 01/ mode resonant frequency by less than 1%, but increases the spurious mode free region by greater than 80% compared with the dielectric rod resonator. Two-dimensional (2D) electric and magnetic field line patterns and 3D field intensity distributions of the ring resonator are plotted, which provide valuable information on mode excitation, coupling, and suppression (6 Refs.) Descriptor(s): dielectric resonators; dielectric-loaded waveguides; waveguide theory Identifier: loaded waveguides; 2D electric field patterns; dielectric ring resonators; microstrip line structure; mode matching technique; resonant frequencies; inner concentric hole diameter; TE/sub 01/ mode; spurious mode free region; magnetic field line patterns; 3D field intensity distributions Class Code: B5240D (Waveguide and cavity theory); B1310 (Waveguides); B2890 (Other dielectric applications and devices) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 131 Accession No: 4035950 INSPEC Abstract No: B9201-7310K-004 Author(s): Jeong Phill Kim; Wee Sang Park Corp Source: Res. & Dev. Lab., Goldstar Precision Co. Ltd., Kyunggi-Do, South Korea Title: Microwave measurement of complex permittivity of dielectric ring resonators using higher-order resonant modes Source: Microwave and Optical Technology Letters, vol.4, no.11 p. 459-63 ISSN: 0895-2477 CODEN: MOTLEO Publication: USA Language: English Year: Oct. 1991 Copyright No: 0895-2477/91/$4.00 Treatment: T Theoretical or Mathematical; X Experimental Record Type: Journal Paper Abstract: A theory and measurement technique to determine the complex permittivity of microwave dielectric ring resonators placed between two conducting plates is presented. The resonant frequencies and unloaded quality factors for higher-order modes, and physical dimensions of the resonator are used to expand the measurement frequency span (10 Refs.) Descriptor(s): dielectric resonators; microwave measurement; permittivity measurement; Q-factor Identifier: microwave measurement; complex permittivity; dielectric ring resonators; resonant frequencies; unloaded quality factors; higher-order modes Class Code: B7310K (Dielectric variables); B7310N (Microwave techniques); B1320 (Waveguide components); B2890 (Other dielectric applications and devices) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 458 Accession No: 3991299 INSPEC Abstract No: B91073233 Author(s): Krupka, J. Corp Source: Inst. Miktroelekroniki i Optoelektroniki, Politech. Warszawska, Poland Title: Measurements of all complex permeability tensor components and the effective line widths of microwave ferrites using dielectric ring resonators Source: IEEE Transactions on Microwave Theory and Techniques, vol.39, no.7 p. 1148-57 ISSN: 0018-9480 CODEN: IETMAB Publication: USA Language: English Year: July 1991 Copyright No: 0018-9480/91/0700-1148$01.00 Treatment: X Experimental Record Type: Journal Paper Abstract: A method of measuring all the complex permeability tensor components of microwave ferrites using a single cylindrical ferrite sample is described. Two dielectric ring resonators having the same height and internal diameter but different external diameters, operating on HE/sub 111//sup +or-/ and H/sub 011/ modes respectively, are applied for these measurements. Permeability tensor components are computed from the measured resonant frequencies and Q factors of these resonators with and without the ferrite sample. Computations are based on the exact eigenvalue equations for these modes. Measurements of all permeability tensor components versus static magnetic field intensity, performed for different ferrite materials, generally confirm results obtained by earlier researchers, but they also contain certain aspects concerning relations between particular permeability tensor components below saturation (24 Refs.) Descriptor(s): magnetic permeability measurement; microwave measurement Identifier: HE/sub 111/ mode; HE/sub 011/ mode; complex permeability tensor components; effective line widths; microwave ferrites; dielectric ring resonators; single cylindrical ferrite sample; measured resonant frequencies; Q factors; exact eigenvalue equations; static magnetic field intensity Class Code: B7310N (Microwave techniques); B7310L (Magnetic variables) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Accession No: 3810996 INSPEC Abstract No: B91008485 Author(s): Matsumura, K.; Ohki, N. Corp Source: Fac. of Eng., Utsunomiya Univ., Japan Title: Dielectric dual ring resonator for millimeter through optical wave integrated circuit Source: Conference Proceedings. 20th European Microwave Conference 90 p. 2 vol. xxviii+1786, 1136-41 vol.2 Publication: UK ISBN: 0946821070 Language: English Publisher: Microwave Exhibitions & Publishers; Tunbridge Wells, UK Conference Loc: Budapest, Hungary; 10-13 Sept. 1990 Year: 1990 Treatment: T Theoretical or Mathematical; X Experimental Record Type: Conference Paper Abstract: Frequency responses of an open type resonator constructed by two coupled dielectric rings which have different diameters (the diameters are relatively large compared to the handling wavelength) are investigated theoretically and experimentally. It is found that the resonance frequency spacing of the resonator system is given by the least common multiple of the resonance frequency spacing of each dielectric ring resonator. The quality factor (Q value) of this resonator system remains at a high value. This dual ring resonator can be widely used for frequency discriminators in the millimeter through to optical wave integrated circuits (4 Refs.) Descriptor(s): dielectric resonators; discriminators; frequency response; microwave filters; microwave integrated circuits; Q-factor Identifier: dielectric dual-ring resonators; frequency response; millimetre wave IC; frequency-responses; optical wave integrated circuit; open type resonator; coupled dielectric rings; resonance frequency spacing; least common multiple; quality factor; frequency discriminators Class Code: B1320 (Waveguide components); B2890 (Other dielectric applications and devices) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Accession No: 3789171 INSPEC Abstract No: B91005765 Author(s): Krupka, J. Corp Source: Inst. Mikroelektroniki I Optoelektroniki Politech. Warszawskiej, Poland Title: A new method of measurement of all complex permeability tensor components of microwave ferrites using one cylindrical ferrite sample Source: Conference Proceedings. 20th European Microwave Conference 90 p. 2 vol. xxviii+1786, 507-11 vol.1 Publication: UK ISBN: 0946821070 Language: English Publisher: Microwave Exhibitions & Publishers; Tunbridge Wells, UK Conference Loc: Budapest, Hungary; 10-13 Sept. 1990 Year: 1990 Treatment: X Experimental Record Type: Conference Paper Abstract: Two dielectric ring resonators having the same heights and internal diameters but different external diameters operating on HE/sub 111//sup +or-/ and H/sub 011/ modes respectively are applied for measurements. Permeability tensor components are computed from the measured resonant frequencies and Q-factors of these resonators with and within ferrite sample. Computations are based on the exact eigenvalue equations for these modes (5 Refs.) Descriptor(s): dielectric resonators; ferrite devices; magnetic permeability measurement; microwave measurement; Q-factor measurement Identifier: HE/sub 111/ mode; complex permeability tensor components; microwave ferrites; cylindrical ferrite sample; dielectric ring resonators; internal diameters; external diameters; H/sub 011/ modes; resonant frequencies; Q-factors; eigenvalue equations Class Code: B7310N (Microwave techniques); B7310L (Magnetic variables); B3120G (Microwave devices); B1320 (Waveguide components) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 436 Accession No: 3760139 INSPEC Abstract No: B90075481 Author(s): Dick, G.J.; Saunders, J. Corp Source: Frequency Stand. Lab., California Inst. of Technol., Pasadena, CA, USA Title: Measurement and analysis of a microwave oscillator stabilized by a sapphire dielectric ring resonator for ultra-low noise Source: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol.37, no.5 p. 339-46 ISSN: 0885-3010 CODEN: ITUCER Publication: USA Language: English Year: Sept. 1990 Copyright No: 0885-3010/90/0900-0339$01.00 Treatment: A Application; X Experimental Record Type: Journal Paper Abstract: Phase-noise measurements are presented for a microwave oscillator whose frequency is stabilized by a whispering gallery mode sapphire ring resonator with Q of 2*10/sup 5/. The nature of the mode, which involves little metallic conduction, allows nearly full use of the very low dielectric loss in sapphire. Several mode families have been identified with good agreement with calculated frequency predictions. Waveguide coupling parameters have been characterized for the principal (lowest frequency) mode family, for n=5 to n=10 full waves around the perimeter. For a 5-cm wheel resonator in a 7.6-cm container, Q-values of above 10/sup 5/ were found at room temperature for all of the modes in this sequence. Coupling Q-values for the same modes ranged from 10/sup 4/ (n=5) to 10/sup 5/ (n=10) for a WR112 waveguide port at the center of the cylinder wall of the containing can. Phase noise measurements for a transistor oscillator locked to the n=10 (7.84-GHz) mode showed a 1/f/sup 3/ dependence for low offset frequencies, and a value of L(f)=-55 dB/Hz at an offset of 10 Hz from the carrier. The oscillator shows phase noise below the previously reported for any X-band source (16 Refs.) Descriptor(s): dielectric resonators; electron device noise; microwave oscillators; sapphire Identifier: waveguide coupling parameters; microwave oscillator; sapphire dielectric ring resonator; ultra-low noise; whispering gallery mode; low dielectric loss; mode families; wheel resonator; Q-values; room temperature; WR112 waveguide port; cylinder wall; transistor oscillator; 1/f/sup 3/ dependence; low offset frequencies; phase noise; X-band source; 300 K; 7.84 GHz; 5 cm; 7.6 cm; Al/sub 2/O/sub 3/ Class Code: B1350 (Microwave circuits and devices); B1230B (Oscillators); B2350 (Microwave tubes); B1320 (Waveguide components); B2890 (Other dielectric applications and devices) Chemical Indx: Al2O3/bin Al2/bin Al/bin O3/bin O/bin Numerical Ind: temperature 3.0 E+02 K; frequency 7.84 E+09 Hz; size 5.0 E-02 m; size 7.6 E-02 m -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Accession No: 3677211 INSPEC Abstract No: B90049407 Author(s): Dick, J.; Saunders, J. Corp Source: Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA Title: Measurement and analysis of a microwave oscillator stabilized by a sapphire dielectric ring resonator for ultra-low noise Source: Proceedings of the 43rd Annual Symposium on Frequency Control 1989 (Cat. No.89CH2690-6) p. ix+643, 107-14 Publication: USA Language: English Publisher: IEEE; New York, NY, USA Sponsor: IEEE; U.S. Army Electron. Technol. & Devices Lab Conference Loc: Denver, CO, USA; 31 May-2 June 1989 Year: 1989 Copyright No: CH2690-6/89/0000-0107$01.00 Treatment: T Theoretical or Mathematical; X Experimental Record Type: Conference Paper Abstract: Phase noise measurements are presented for a microwave oscillator whose frequency is stabilized by a whispering-gallery mode sapphire ring resonator with Q of 2*10/sup 5/. Isolation of RF fields by the special nature of the electromagnetic mode allows the very low loss of the sapphire itself to be realized. Several mode families have been identified with fairly good agreement with calculated frequency predictions. Waveguide coupling parameters have been characterized for the principal (lowest frequency) mode family, for n=5 to n=10 full waves around the perimeter. Based on the measurements and on the performance of commercially available phase detectors, the performance for a cooled resonator operating at 77 K with a Q of 3*10/sup 7/ is projected to be -85 dB/Hz at an offset of 1 Hz. This value is 30 dB below that of the best X-band source presently available, a frequency-multiplied quartz crystal oscillator (13 Refs.) Descriptor(s): dielectric resonators; frequency stability; microwave oscillators; sapphire Identifier: phase noise measurements; waveguide coupling parameters; microwave oscillator; sapphire dielectric ring resonator; ultra-low noise; whispering-gallery mode; electromagnetic mode; cooled resonator; 77 K Class Code: B1350 (Microwave circuits and devices); B1230B (Oscillators); B2890 (Other dielectric applications and devices) Numerical Ind: temperature 7.7 E+01 K -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: Check the catalogs in your library. Libraries that Own Item: 148 Accession No: 3516769 INSPEC Abstract No: A90005016 B90000777 Author(s): Wolak, J.; Hilczer, B. Corp Source: Inst. of Molecular Phys., Polish Acad. of Sci., Poznan, Poland Title: Some applications of microwave ceramic ring resonator in laboratory measurements Source: Ferroelectrics (UK), Ferroelectrics, vol.93 p. 73-6 ISSN: 0015-0193 CODEN: FEROA8 Publication: UK Language: English Sponsor: Swiss Federal Inst. Technol.; Univ. Zurich; Eur. Phys. Soc.; Swiss Nat. Sci. Found.; Swiss Soc. Natural Sci; IEEE; et al Conference: ECAPD-1/ISAF'88. 1st European Conference on Applications of Polar Dielectrics and International Symposium on Applications of Ferroelectrics Conference Loc: Zurich, Switzerland; 29 Aug.-1 Sept. 1988 Year: 1989 Treatment: A Application; P Practical; X Experimental Record Type: Conference Paper; Journal Paper Abstract: The authors discuss pillbox and open ring short circuited dielectric resonators. A confining of the magnetic field of TE/sub 011/ mode in the empty region of the ring resonator enabled them to employ the resonator as EPR cavity. Experimental results are shown (7 Refs.) Descriptor(s): cavity resonators; dielectric resonators; microwave devices; microwave measurement; paramagnetic resonance; permittivity measurement Identifier: ceramic microwave ring resonator; pillbox dielectric resonator; EPR cavity; dielectric ring resonator; magnetic field confinement; open ring short circuited dielectric resonators; TE/sub 011/ mode Class Code: A0758 (Magnetic resonance spectrometers, auxiliary instruments and techniques); A0750 (Electrical instruments and techniques); B1320 (Waveguide components); B2890 (Other dielectric applications and devices); B7310N (Microwave techniques); B7310K (Dielectric variables) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 340 Accession No: 3231373 INSPEC Abstract No: B88063851 Author(s): Paul, D.L.; Habibi, M.; Gelin, P. Corp Source: Ecole. Nat. Superieure des Telecommun de Bretagne., Brest., France Title: Resonant frequency analysis of dielectric ring resonators Source: Electronics Letters, vol.24, no.16 p. 1004-5 ISSN: 0013-5194 CODEN: ELLEAK Publication: UK Translated In: A14 Language: English Year: 4 Aug. 1988 Copyright No: 0013-5194/88/$3.00+0.00 Treatment: T Theoretical or Mathematical Record Type: Journal Paper Abstract: The mode-matching technique is applied to guided and continuous spectra to derive the resonant frequencies of the high-order azimuthal modes of dielectric ring resonators. The numerical results of this field theory analysis are in close agreement with the measurements in the X-band (4 Refs.) Descriptor(s): dielectric resonators; waveguide theory Identifier: resonant frequency analysis; microwave resonators; mode-matching technique; high-order azimuthal modes; dielectric ring resonators; X-band Class Code: B1320 (Waveguide components); B2890 (Other dielectric applications and devices); B5240D (Waveguide and cavity theory) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 201 Accession No: 3137899 INSPEC Abstract No: A88053413 B88033713 Author(s): Braginskii, V.B.; Il'chenko, V.S. Corp Source: M.V. Lomonosov State Univ., Moscow, USSR Title: Properties of optical dielectric microresonators Source: Doklady Akademii Nauk SSSR, vol.293, no.4-6 p. 1358-61 ISSN: 0002-3264 CODEN: DANKAS Publication: USSR Translated In: Soviet Physics - Doklady, vol.32, no.4 p. 306-7 ISSN: 0038-5689 CODEN: SPHDA9 Country: USA Language: English Year: April 1987; April 1987 Copyright No: 0038-5689/87/040306-02$02.20 Treatment: P Practical; T Theoretical or Mathematical Record Type: Journal Paper Abstract: Dielectric ring microwave resonators with azimuthal whispering-gallery modes (total internal reflection) are used successfully in experimental physics and in engineering. In such resonators it has been possible to observe losses in perfect single-crystal-dielectrics and to attain Q equivalent to 1.10/sup 8/ and 1.10/sup 9/ at T=77 K and 4 K, respectively. When the linear dimensions of the dielectric disk (or ellipsoid or sphere) are reduced by three or four orders of magnitude in comparison with the dimensions of a microwave resonator, an optical dielectric microresonator can be constructed with roughly the same number of waves packed along a closed curve along the surface. Such a resonator is shown to have several interesting physical properties (7 Refs.) Descriptor(s): dielectric resonators; optical waveguide components; quartz Identifier: dielectric ring microwave resonators; quartz; optical dielectric microresonators; azimuthal whispering-gallery modes; losses; perfect single-crystal-dielectrics; microwave resonator; physical properties; SiO/sub 2/ Class Code: A4280L (Optical waveguides and couplers); B4130 (Optical waveguides) Chemical Indx: SiO2/bin O2/bin Si/bin O/bin -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 458 Accession No: 3109877 INSPEC Abstract No: B88025382 Author(s): Kobayashi, Y.; Minegishi, M. Corp Source: Dept. of Electr. Eng., Saitama Univ., Japan Title: Precise design of a bandpass filter using high-Q dielectric ring resonators Source: IEEE Trans. Microw. Theory Tech. (USA), IEEE Transactions on Microwave Theory and Techniques, vol.MTT-35, no.12 p. 1156-60 ISSN: 0018-9480 CODEN: IETMAB Publication: USA Translated In: A06 Language: English Sponsor: IEEE Conference: 1987 IEEE MTT-S International Microwave Symposium Conference Loc: Las Vegas, NV, USA; 9-11 June 1987 Year: Dec. 1987 Copyright No: 0018-9480/87/1200-1156$01.00 Treatment: P Practical Record Type: Conference Paper; Journal Paper Abstract: A design approach is presented for a bandpass filter constructed by placing Te/sub 01 delta / dielectric ring resonators coaxially in a TE/sub 01/ cutoff circular waveguide. Using the mode-matching technique, the interresonator coupling coefficients are determined from the calculation of two resonant frequencies, f/sub sh/ and f/sub 0p/ when the structurally symmetric plane is short- and open-circuited, respectively. For the TE/sub 01 delta / ring resonator, the resonant frequency, the temperature coefficient tau /sub f/, the unloaded Q/sub u/, and the other resonances are calculated in a similar way. From the calculations, the optimum dimensions are determined for obtaining the maximum Q/sub u/ while keeping f/sub r//f/sub 0/ constant, where f/sub r/ is the next highest resonant frequency. A four-stage Chebyshev filter was fabricated using these resonators; the measured frequency responses agree well with theory (10 Refs.) Descriptor(s): band-pass filters; circular waveguides; dielectric resonators; microwave filters Identifier: bandpass filter; high-Q dielectric ring resonators; Te/sub 01 delta /; TE/sub 01/ cutoff circular waveguide; mode-matching technique; interresonator coupling coefficients; resonant frequencies; structurally symmetric plane; optimum dimensions; four-stage Chebyshev filter; frequency responses Class Code: B1270D (Passive filters and other passive networks); B1320 (Waveguide components) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Accession No: 3019795 INSPEC Abstract No: B87073636 Author(s): Kobayashi, Y.; Minegishi, M. Corp Source: Dept. of Electr. Eng., Saitama Univ., Japan Title: A bandpass filter using high-Q dielectric ring resonators Source: 1987 IEEE MTT-S International Microwave Symposium Digest (Cat. No.87CH2395-2) p. 2 vol. v+1045, 379-82 vol.1 Publication: USA Translated In: C22 Language: English Publisher: IEEE; New York, NY, USA Sponsor: IEEE Conference Loc: Las Vegas, NV, USA; 9-11 June 1987 Year: 1987 Copyright No: 0149-645X/87/0000-0379$01.00 Treatment: P Practical; T Theoretical or Mathematical; X Experimental Record Type: Conference Paper Abstract: A Chebyshev bandpass filter constructed by placing high-Q TE/sub 01/ delta dielectric ring resonators coaxially in a TE/sub 01/ cutoff circular waveguide is designed precisely by the mode-matching technique. Some discussion on the design of the high-Q resonators and inter-resonator coupling are presented. The filter structure presented allows the authors to realize precise filter design and ease of fabrication because of its simple configuration (8 Refs.) Descriptor(s): band-pass filters; Chebyshev approximation; dielectric resonators; microwave filters; passive filters; waveguide components Identifier: Chebyshev type; passive microwave filters; bandpass filter; dielectric ring resonators; TE/sub 01/ delta ; TE/sub 01/ cutoff circular waveguide; mode-matching technique; high-Q resonators; inter-resonator coupling Class Code: B1270D (Passive filters and other passive networks); B1320 (Waveguide components) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: Check the catalogs in your library. Libraries that Own Item: 22 Accession No: 2624311 INSPEC Abstract No: A86040634 Author(s): Braginskii, V.B.; Bagdasarov, Kh.S.; Bulygin, F.V.; Il'chenko, V.S. Corp Source: M.V. Lomonosov State Univ., Moscow, USSR Title: Temperature and frequency dependence of the damping of electromagnetic waves in high-quality dielectric single crystals Source: Pis'ma v Zhurnal Tekhnicheskoi Fizika, vol.11, no.7-8 p. 427-30 ISSN: 0320-0108 CODEN: PZTFDD Publication: USSR Translated In: Soviet Technical Physics Letters, vol.11, no.4 p. 177-8 ISSN: 0360-120X CODEN: STPLD2 Country: USA Language: English Year: April 1985; April 1985 Copyright No: 0360-120X/85/040177-02$02.60 Treatment: X Experimental Record Type: Journal Paper Abstract: The authors show that the methods available for growing leucosapphire and yttrium aluminum garnet single crystals are capable of producing crystals of a structural quality so high that the dissipation of electromagnetic waves in the microwave range is close to the limiting values for ideal crystals. These results also indicate that a leucosapphire dielectric ring resonator is preferable to a superconducting resonator at temperatures in the liquid-helium region (12 Refs.) Descriptor(s): electromagnetic wave absorption; garnets; minerals; yttrium compounds Identifier: electromagnetic wave damping; temperature dependence; YAG single crystal; frequency dependence; high-quality dielectric single crystals; leucosapphire; structural quality; dissipation; microwave range; dielectric ring resonator Class Code: A7870G (Microwave and radiofrequency interactions with condensed matter) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 59 Accession No: 2425764 INSPEC Abstract No: B85023092 Author(s): Crombach, U.; Gesche, R.; Lochel, N. Corp Source: Systor Gesellschaft fur EDV mbH, Mainz, West Germany Title: Tunable dielectric ring-resonators Source: Frequenz, vol.39, no.1-2 p. 45-9 ISSN: 0016-1136 CODEN: FQNZA3 Publication: West Germany Language: German Year: Jan.-Feb. 1985 Treatment: T Theoretical or Mathematical Record Type: Journal Paper Abstract: Shielded cylindrical dielectric resonators are investigated by means of the orthogonal expansion method. They consist of a number of concentric cylinders which are arbitrarily layered in an axial direction. Resonant frequencies and fields are discussed for various ring-resonators. The influence of a concentric tuning substance is investigated in detail. By axial displacement of a dielectric post in the ring, the resonant frequency can be varied up to 9%. Using a tuning ring placed over the resonator the variation can be extended up to 20%. In both cases, the resonant mode remains unchanged (16 Refs.) Descriptor(s): dielectric resonators; tuning Identifier: tunable dielectric ring resonators; shielded cylindrical dielectric resonators; orthogonal expansion method; concentric cylinders; resonant frequency Class Code: B1320 (Waveguide components); B2890 (Other dielectric applications and devices) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Accession No: 2408956 INSPEC Abstract No: B85017790 Author(s): Kobayashi, V.; Miura, M. Corp Source: Dept. of Electr. Eng., Saitama Univ., Japan Title: Optimum design of shielded dielectric rod and ring resonators for obtaining the best mode separation Source: 1984 IEEE MTT-S International Microwave Symposium Digest. Expanding Microwave Horizons (Cat. No. 84CH2034-7) p. xxvii+606, 184-6 Publication: USA Language: English Publisher: IEEE; New York, NY, USA Sponsor: IEEE Conference Loc: San Francisco, CA, USA; 29 May-1 June 1984 Year: 1984 Copyright No: 0149-645X/84/0000-0184$01.00 Treatment: T Theoretical or Mathematical; X Experimental Record Type: Conference Paper Abstract: Accurate resonant frequencies of shielded dielectric rod and ring resonators are computed by means of the mode-matching technique. For four cases of rod and ring resonators with TE/sub 01 delta / and HE/sub 11 delta / modes, the optimum dimensions to obtain the best separation of the neighboring modes from the mode of interest are determined. It is seen that reduction of size and improvement of the mode separation can be achieved by using the ring resonator (7 Refs.) Descriptor(s): dielectric resonators; waveguide theory Identifier: shielded dielectric rod resonators; shielded dielectric ring resonators; dielectric resonators; mode separation; mode-matching technique; optimum dimensions; modes; reduction of size Class Code: B1320 (Waveguide components); B2890 (Other dielectric applications and devices); B5240D (Waveguide and cavity theory) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 468 Accession No: 1950779 INSPEC Abstract No: B82058674 Author(s): Blair, D.G.; Evans, I.N. Corp Source: Dept. of Phys., Univ. of Western Australia, Nedlands, WA, Australia Title: High-Q microwave properties of a sapphire ring resonator Source: Journal of Physics D (Applied Physics), vol.15, no.9 p. 1651-6 ISSN: 0022-3727 CODEN: JPAPBE Publication: UK Language: English Year: 14 Sept. 1982 Treatment: N New Development; P Practical; X Experimental Record Type: Journal Paper Abstract: The high-Q microwave properties of a sapphire dielectric ring resonator in the frequency ranges 8-12 GHz and 18-22 GHz at both room temperature and low temperature are discussed. The Q of the resonator is limited significantly below the loss tangent limit, but the frequency stability is excellent when compared with other types of resonator. The results indicate that the sapphire ring resonator should be well suited for use in long-term, high-stability frequency standards, and should also be useful for phase noise stabilisation of microwave sources (12 Refs.) Descriptor(s): cavity resonators; dielectric devices; microwave devices; sapphire Identifier: 8 to 12 GHz; 18 to 22 GHz; high-Q microwave properties; sapphire dielectric ring resonator; frequency stability; high-stability frequency standards; phase noise stabilisation Class Code: B1320 (Waveguide components) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 59 Accession No: 1833474 INSPEC Abstract No: B82019845 Author(s): Crombach, U.; Michelfeit, R. Corp Source: Tech. Hochschule, Darmstadt, West Germany Title: Resonant frequencies and fields in shielded dielectric ring- and disc resonators Source: Frequenz, vol.35, no.12 p. 324-8 ISSN: 0016-1136 CODEN: FQNZA3 Publication: West Germany Language: German Year: Dec. 1981 Treatment: P Practical Record Type: Journal Paper Abstract: Shielded dielectric ring- and disc resonators are investigated by means of the mode-matching technique. Numerical results are given for the lowest-order resonance modes of different resonators. The deviation of the calculated resonant frequencies from calculated and measured values given in literature is smaller than 0.2% or 0.8%, respectively. Influence of disc radius and shielding on the resonance mode of one disc resonator is investigated and figured by plots of the calculated lines of magnetic field and the stored energy. The resonances are classified as 'inner' and 'outer' resonance modes (25 Refs.) Descriptor(s): dielectric devices; dielectric resonance; microwave oscillators; resonators Identifier: shielded dielectric ring resonators; shielded dielectric disc resonances; mode-matching technique; lowest-order resonance modes; resonant frequencies; disc radius; resonance mode; magnetic field; stored energy Class Code: B1320 (Waveguide components); B2890 (Other dielectric applications and devices) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: Check the catalogs in your library. Libraries that Own Item: 22 Accession No: 1802126 INSPEC Abstract No: B82009218 Author(s): Braginskii, V.B.; Bagdasarov, Kh.S.; Panov, V.I.; Timashev, A.V. Title: High-Q dielectric ring resonator Source: Pis'ma v Zhurnal Tekhnicheskoi Fizika, vol.7, no.1-2 p. 10-12 ISSN: 0320-0108 CODEN: PZTFDD Publication: USSR Translated In: Soviet Technical Physics Letters, vol.7, no.1 p. 4 ISSN: 0360-120X CODEN: STPLD2 Country: USA Language: English Year: Jan. 1981; Jan. 1981 Treatment: X Experimental Record Type: Journal Paper Abstract: The authors report some preliminary measurements of the quality factors of ring resonators of this type over the frequency range 8-10 GHz (4 Refs.) Descriptor(s): cavity resonators; dielectric devices; microwave generation; Q-factor Identifier: microwave source; 8 to 10 GHz; dielectric ring resonator; quality factors Class Code: B1320 (Waveguide components); B2890 (Other dielectric applications and devices) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Provider: OCLC Database: INSPEC Ownership: FirstSearch indicates your institution owns the item. Libraries that Own Item: 201 Accession No: 1654382 INSPEC Abstract No: A81031087 B81015199 Author(s): Braginskii, V.B.; Vyatchanin, S.P. Corp Source: M.V. Lomonosov State Univ., Moscow, USSR Title: High-Q dielectric resonators Source: Doklady Akademii Nauk SSSR, vol.252, no.1-3 p. 584-5 ISSN: 0002-3264 CODEN: DANKAS Publication: USSR Translated In: Soviet Physics - Doklady, vol.25, no.5 p. 385-6 ISSN: 0038-5689 CODEN: SPHDA9 Country: USA Language: English Year: May 1980; May 1980 Treatment: T Theoretical or Mathematical Record Type: Journal Paper Abstract: The authors draw attention to the possibility of constructing high-Q dielectric ring resonators (closed dielectric waveguides) on the basis of the phenomenon of total internal reflection (without deposition of a superconductor). In such a resonator the quantity (1/f)( delta f/ delta T) should be determined entirely by the coefficient of thermal expansion and should not exceed 10/sup -11/ K/sup -1/ at T approximately=2K. Synthetic sapphire, which in the microwave range has a quite high dielectric permittivity ( epsilon /sub ///=10.6, epsilon /sub perpendicular to /=8.5) and low dielectric losses (tan delta <2.10/sup -9/ at T=2K should be the most appropriate material for such a resonator (4 Refs.) Descriptor(s): dielectric losses; permittivity; resonators; sapphire; waveguide components Identifier: high-Q dielectric ring resonators; closed dielectric waveguides; total internal reflection; thermal expansion; sapphire; dielectric permittivity; dielectric losses Class Code: A7720 (Dielectric permittivity); A7740 (Dielectric loss and relaxation); B1320 (Waveguide components); B2890 (Other dielectric applications and devices) --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------