Room Temperature Measurement of the Anisotropic Loss Tangent of Sapphire Using the Whispering Gallery Mode Technique

John Hartnett, Michael Tobar, Eugene Ivanov, J. Krupka

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The anisotropic loss tangent has been determined in monocrystalline sapphire for components parallel and perpendicular to the crystal axis, using the whispering gallery (WG) mode method. The Q-factors of quasi-TE and quasi-TM modes were measured precisely in four cylindrical sapphire resonators at room temperature, from which was determined a maximum attainable Q-factor of (2.1 +/- 0.2) X 10(5) at 9 GHz in a quasi-TM mode. Sapphire dielectric material from three different manufacturers was compared over the 270-345 K temperature range and the 5-16 GHz frequency range.
Original languageEnglish
Pages (from-to)34-38
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume53
Issue number1
DOIs
Publication statusPublished - 2006

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