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.
|Journal||IEICE Transactions on Electronics|
|Publication status||Published - 2003|
Watabe, K., Oshima, S., Ikegami, T., & Hartnett, J. (2003). Tunable Double-Sapphire-Loaded Microwave Cavity with High-Q Factor. IEICE Transactions on Electronics, E86-C(7), 1393-1396. http://search.ieice.org/bin/index.php?category=C&lang=E&curr=1