Tunable Double-Sapphire-Loaded Microwave Cavity with High-Q Factor

Ken-ichi WATABE  Shin-ichi OHSHIMA  Takeshi IKEGAMI  John G. HARTNETT  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.7   pp.1393-1395
Publication Date: 2003/07/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
Keyword: 
frequency-tuning method,  microwave,  double-sapphire-loaded cavity,  whispering gallery mode,  

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Summary: 
A frequency-tuning method in the microwave region, which maintains a high unloaded Q-factor, was demonstrated using a double-sapphire-loaded cavity which operates on the Whispering Gallery mode, WGH9,1,0. Two adjacent nominally identical sapphire cylinders were positioned in a copper cavity and tuned by changing their relative coupling. A frequency tuning range of 85 MHz and a maximum unloaded Q-factor of 1.3 105 was experimentally measured at room temperature. This is only 13% less than the single resonator Q-factor, which is a small compromise to pay for the increased tuning capacity.