Q Factor of a millimeter-wave sapphire disk resonator with conductive end plates

Barannik, A. A.; Prokopenko, Yu.V.; Filipov, Yu.F.; Cherpak, N. T.; Korotash, I. V.

doi:10.1134/1.1576479

Cited by 10 publications

(9 citation statements)

References 3 publications

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“…A one layer cylindrical sapphire Bragg resonator with Q-factor of 230 000 was achieved at 9.7 GHz 14 (Figures 16 and 17). This is higher than a Whispering Gallery mode resonator at room temperature at the same frequency (Q WGH ∼ 200 000, Q WGE ∼ 100 000) 83,84,[96][97][98][99][100] and equivalent to a single spherical Bragg resonator. 20 However, the machining and assembly are much easier in the spherical case.…”

Section: B Cylindrical Bragg Resonatormentioning

confidence: 84%

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Invited Article: Dielectric material characterization techniques and designs of high-Q resonators for applications from micro to millimeter-waves frequencies applicable at room and cryogenic temperatures

Floch

Fan

Humbert

et al. 2014

Review of Scientific Instruments

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Dielectric resonators are key elements in many applications in micro to millimeter wave circuits, including ultra-narrow band filters and frequency-determining components for precision frequency synthesis. Distributed-layered and bulk low-loss crystalline and polycrystalline dielectric structures have become very important for building these devices. Proper design requires careful electromagnetic characterization of low-loss material properties. This includes exact simulation with precision numerical software and precise measurements of resonant modes. For example, we have developed the Whispering Gallery mode technique for microwave applications, which has now become the standard for characterizing low-loss structures. This paper will give some of the most common characterization techniques used in the micro to millimeter wave regime at room and cryogenic temperatures for designing high-Q dielectric loaded cavities.

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Section: B Cylindrical Bragg Resonatormentioning

confidence: 84%

“…r The whispering gallery modes techniques 15,27,47,48,[55][56][57][58][59][60][61][81][82][83][84] for a thickness from cm to a few mm. This is the most accurate technique to characterize low-loss material properties;…”

Section: Materials Characterization Using Wg and Te Modesmentioning

confidence: 99%

Invited Article: Dielectric material characterization techniques and designs of high-Q resonators for applications from micro to millimeter-waves frequencies applicable at room and cryogenic temperatures

Floch

Fan

Humbert

et al. 2014

Review of Scientific Instruments

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“…The theory of eigenmodes in anisotropic cylindrical DRs with conducting endplates (CEPs) has been developed further [9][10][11][12][13][14][15][16][17]. Here the characteristic equations for the DR and expressions for the components and energy of the electromagnetic field were obtained, which allow us to study the spectral and energy characteristics of resonators, taking into account energy losses in the materials of which they are made [10,11,15,[16][17][18][19]. The conditions for separating the modes were also defined [11][12][13].…”

Section: A) Resonators With Derived Analytical Solutions 1 ) Resonatomentioning

confidence: 99%

“…The analytical solution of the unloaded Q-factor of the anisotropic resonator with HE or EH modes was developed and is of interest for measuring the small values of the surface resistance or, in the general case, the surface impedance of conductors and superconductors in the mm-wave range [15,[17][18][19]. The integral equation for the DR frequencies was obtained taking into account the finite conductivity of the endplates [11,13,17].…”

Section: A) Resonators With Derived Analytical Solutions 1 ) Resonatomentioning

confidence: 99%

Whispering gallery mode resonators in microwave physics and technologies

Barannik

Yakovenko

Cherpak

et al. 2016

Int. J. Microw. Wireless Technol.

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We review the main results of the development of whispering gallery mode (WGM) resonators and their unique applications due to their quasi-optical functionality. Several types of advanced WGM resonators are proposed by the authors. The theoretical results are described for the resonators with an analytical solution of the electromagnetic problems. Special emphasis is given to the interaction of moving charged particles and waves of cylindrical resonators. Important aspects are described concerning the developed sapphire resonators, for which an exact solution can only be found by using specially designed computer program products. A separate section of the paper is devoted to application aspects of the WGM resonators. In particular, it describes advanced solutions for overcoming the problems of measuring the small microwave (MW) surface impedance of unconventional superconductors in the form of large-area thin films and small samples under study. In addition, a demonstration of accurate complex permittivity measurements of small volumes of lossy liquids is provided. Special emphasis is given to highly stable MW signal sources, namely Ka-band transistor-based feedback oscillator and solid-state maser WGM oscillators. Recently obtained results are presented of experimental studies of the auto-oscillatory system developed on the basis of the WGM resonator with relativistic electron beam.

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“…Dielectric resonators are widely used for microwave dielectric property measurements of a low loss, homogeneous isotropic medium [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Metal shields are always introduced to prevent radiation loss.…”

Section: Introductionmentioning

confidence: 99%

A dielectric resonator method of measuring dielectric properties of low loss materials in the microwave region

Sheen¹

2008

Meas. Sci. Technol.

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A technique for the measurement of dielectric properties of low loss and homogeneously isotropic media in the microwave region is studied. The measuring structure is a resonator made up of a cylindrical dielectric rod and conducting plates. The dielectric constants and loss tangents are computed from the resonant frequencies, structure dimensions and unloaded Qs of the TE 01δ mode. A simple field model is introduced to analyze this resonator structure. Unlike other simple models, this model does not have the defect of low measurement accuracy of dielectric properties. Important factors affecting the dielectric properties measurements are introduced. Error sources for measurements are also discussed. The measurement accuracy is justified by comparing the results with those of other techniques. In addition, various methods for calculating the power factor and conducting loss and for measuring the conductivity of the conducting plates are discussed. The accuracies of certain of these methods have not previously been studied, but are given in this paper. The swept frequency capability was also studied. It was found that dielectric properties in microwave frequencies could be measured within a frequency range of 3 GHz.

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Q Factor of a millimeter-wave sapphire disk resonator with conductive end plates

Cited by 10 publications

References 3 publications

Invited Article: Dielectric material characterization techniques and designs of high-Q resonators for applications from micro to millimeter-waves frequencies applicable at room and cryogenic temperatures

Invited Article: Dielectric material characterization techniques and designs of high-Q resonators for applications from micro to millimeter-waves frequencies applicable at room and cryogenic temperatures

Whispering gallery mode resonators in microwave physics and technologies

A dielectric resonator method of measuring dielectric properties of low loss materials in the microwave region

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