Whispering gallery modes in hollow spherical dielectric resonators

Zychowicz, T.; Křupka, J.; Tobar, Michael E.

doi:10.1016/j.jeurceramsoc.2005.09.078

Cited by 4 publications

(5 citation statements)

References 4 publications

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“…The Q values obtained here are of the order of those obtained for spherical resonators in cavities [19,23]. Micro-machined hemispherical cavity resonators with radii ~2 mm are also reported to have frequencies ~10 2 GHz and Q values ~ [24].…”

Section: Resultssupporting

confidence: 52%

“…Losses in the composite dielectric spherical shell resonator in the reasons 0 £ r £ a and a £ r £ b can be evaluated as explained earlier [5]. The expression for the metallic loss (P mn ) due to a finite conductivity (s) of the metallic shield in the shielded composite dielectric spherical resonator for the TE n0l modes is given by,…”

Section: Lossesmentioning

confidence: 99%

“…At millimeter-wave frequencies the reduction in the size of the dielectric resonators has focused the attention of the researchers towards new shapes such as spherical [3] and hemispherical resonators [4]. Single shell spherical dielectric Bragg resonators with Q values as high as 10 5 have been constructed [5]. The quality factor Q depends either on conduction and dielectric losses for the closed structures or radiation and dielectric losses for the open structures.…”

Section: Introductionmentioning

confidence: 99%

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Normal modes and quality factors of shielded composite dielectric spherical resonators

Yadav

Maurya

et al. 2009

Indian J Phys

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Electromagnetic field analysis of shielded composite dielectric spherical resonator in which the dielectric sphere is composed of two concentric spheres with different dielectric materials has been made. Characteristic equations for the TE nml and TM nml modes have been derived. From these characteristic equations, the resonant frequencies and quality factors have been calculated using numerical method. Computations of the resonant frequencies and quality factors have been made for resonators with parameters suitable for the optical and microware regions.In this paper we have presented the analysis and the results obtained from the numerical computations for shielded composite dielectric spherical resonator in which the dielectric sphere is composed of two concentric spheres with different dielectric materials. Starting from the Maxwell's equations for such a resonators have been derived and resonant frequencies and quality factor's have been calculated for the TE nml and TM nml modes using numerical method.

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Section: Resultssupporting

confidence: 52%

Section: Lossesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Normal modes and quality factors of shielded composite dielectric spherical resonators

Yadav

Maurya

et al. 2009

Indian J Phys

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“…A convergence study was then conducted to find the optimum number of modes required. The tanδ of a quartz single crystal at room temperature 22 is of the order of 2 × 10 −5 . Krupka et al 10 demonstrated that the temperature dependence of the losses in single‐crystal quartz are complex over the range 10–300 K but fairly constant over the 10–100 K range at around 1.2 × 10 −5 .…”

Section: Resultsmentioning

confidence: 99%

Do Grain Boundaries Affect Microwave Dielectric Loss in Oxides?

Breeze

Perkins

McComb

et al. 2009

Journal of the American Ceramic Society

137

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Reducing loss in microwave dielectrics is critical to improving performance in wireless communications systems. Grain boundaries in polycrystalline microwave dielectric ceramics have long been suspected of increasing dielectric loss. They are often cited as the main contributor to the observed difference in dielectric losses between single crystals and polycrystalline ceramics. The exact configuration of grain boundaries is problematic to quantify in practice and their influence on the dielectric loss difficult to distinguish from other defects such as porosity, oxygen vacancies, impurities, and dislocations. Here we measure the sensitivity of a single grain boundary in a magnesium oxide bi‐crystal to the polarization of an applied microwave field as a function of temperature.

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“…Also it is crucial for such devices to find a material with a zero or very small sensitivity to temperature fluctuations. In figures 6 and 7, we compare the diamond sample with other crystals like sapphire 23 currently used in the best record ultra stable clocks and quartz, YAG [24][25] , alumina 11 . In figure 6, it is really important to notice the loss tangent of diamond has an opposite sign with standard crystals.…”

Section: Comparison With Well Known Crystals and Other Investigationsmentioning

confidence: 99%

Electromagnetic properties of polycrystalline diamond from 35 K to room temperature and microwave to terahertz frequencies

Floch

Bara

Hartnett

et al. 2011

Journal of Applied Physics

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Whispering gallery modes in hollow spherical dielectric resonators

Cited by 4 publications

References 4 publications

Normal modes and quality factors of shielded composite dielectric spherical resonators

Normal modes and quality factors of shielded composite dielectric spherical resonators

Do Grain Boundaries Affect Microwave Dielectric Loss in Oxides?

Electromagnetic properties of polycrystalline diamond from 35 K to room temperature and microwave to terahertz frequencies

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