Title :
Extremely high-Q factor dielectric resonators for millimeter-wave applications
Author :
Krupka, Jerzy ; Tobar, Michael E. ; Hartnett, John G. ; Cros, Dominique ; le Floch, Jean-Michel
Author_Institution :
Inst. of Microelectron. & Optoelectron., Warsaw Univ. of Technol.
Abstract :
It has been proven, based on a rigorous electromagnetic analysis, that spherical TE10p-mode Bragg-reflection resonators exhibit many times higher Q factors than corresponding cylindrical TE01delta-mode dielectric resonators, dielectric whispering-gallery-mode resonators, or empty spherical TE10p-mode cavities. Rigorous equations have been derived that allow optimally designed Q-factor and "quarter-wavelength" reflector-multilayered-spherical Bragg-reflection resonators. Experiments have been performed on three-layer spherical resonators made of single-crystal YAG and single-crystal quartz. The unloaded Q factor for the TE012 mode in these resonators was 1.04times105 at 26.26 GHz for YAG and 6.4times104 at 27.63 GHz for quartz
Keywords :
Q-factor; aluminium compounds; dielectric resonators; garnets; millimetre wave devices; optical multilayers; quartz; yttrium compounds; 26.26 GHz; 27.63 GHz; SiO2; YAG; YAl5O12; electromagnetic analysis; high-Q factor dielectric resonators; millimeterwave applications; quarter-wavelength reflector-multilayered-spherical Bragg-reflection resonators; single crystal YAG; single-crystal quartz; yttrium aluminium garnet crystal; Ceramics; Dielectric losses; Dielectric materials; Filling; Frequency; Microwave devices; Millimeter wave technology; Optical resonators; Permittivity; Resonance; Bragg scattering; dielectric materials; dielectric resonators; millimeter-wave technology;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2004.840572
