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

K. Watabe, S. Oshima, T. Ikegami, John Hartnett

Research output: Contribution to journalArticlepeer-review


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, WGH(9,1,0). 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 x 10(5) 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.
Original languageEnglish
Pages (from-to)1393-1396
JournalIEICE Transactions on Electronics
Issue number7
Publication statusPublished - 2003


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