Title :
A whispering gallery mode sapphire resonator with semi-spherical enclosure
Author :
Chi Wang ; Zaki, K.A.
Author_Institution :
Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA
Abstract :
A new ultra-stable sapphire resonator combined with a specially designed enclosure with semi spherical sidewall is presented and modeled by mode matching method. Stair steps are used to approximate the semi spherical sidewall to simplify the modeling procedure. The characteristic equation of the sapphire resonator can be obtained by solving the discontinuities of the cylindrical region and the spherical region. Resonant frequency, field distribution and unloaded Q of the resonant mode are obtained. Accurate and reliable results of the resonator can be obtained. Good separation of a whispering Gallery mode is obtained by optimizing the structure dimensions.
Keywords :
Q-factor; dielectric resonators; mode matching; sapphire; Al/sub 2/O/sub 3/; Q-factor; characteristic equation; field distribution; mechanical design; mode matching model; resonant frequency; semi-spherical enclosure; stair steps; whispering gallery mode sapphire resonator; Boundary conditions; Educational institutions; Electromagnetic fields; Equations; Mode matching methods; Resonance; Resonant frequency; Stability; Vibrations; Whispering gallery modes;
Conference_Titel :
Microwave Symposium Digest. 2000 IEEE MTT-S International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-5687-X
DOI :
10.1109/MWSYM.2000.863561