Extremely high-Q factor dielectric resonators for millimeter-wave applications

J. Krupka, Michael Tobar, John Hartnett, D. Cros, Jean-Michel Le Floch

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


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-gailery-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 1.04 x 10(5) at 26.26 GHz for YAG and 6.4 x 10(4) at 27.63 GHz for quartz.
Original languageEnglish
Pages (from-to)702 - 712
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number2
Publication statusPublished - 2005


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