Title :
Whispering-gallery modes in shielded hemispherical dielectric resonators
Author :
Eremenko, Zoya E. ; Filipov, Yury F. ; Kharkovsky, Sergey N. ; Kutuzov, Vladimir V. ; Kogut, Alexander E.
Author_Institution :
Usikov Inst. for Radio-Phys. & Electron., Acad. of Sci., Kharkov, Ukraine
fDate :
11/1/2002 12:00:00 AM
Abstract :
The results of the numerical and experimental investigations of whispering-gallery (WG) modes in shielded hemispherical dielectric resonators are presented in this paper. It is shown that the Q factor of WG modes in the shielded resonator can be ten times much higher than the Q factor of the similar open hemispherical dielectric-resonator modes. Shielding the resonator can decrease the dimensions of both the dielectric hemisphere and resonator as a whole, saving the high-Q factor of WG modes. The usage of a cylindrical shield and local flat reflectors in the experiment provides the investigation of the high-Q factor of WG modes in the resonator.
Keywords :
Bessel functions; Maxwell equations; Q-factor; computational electromagnetics; dielectric resonators; Bessel functions; Hankel functions; Maxwell equations; Neumann functions; Q factor; cylindrical shield; dielectric hemisphere dimensions; field distribution; layered resonator; local flat reflectors; radial-mode distribution; shielded hemispherical dielectric resonators; whispering-gallery modes; Dielectric losses; Laser modes; Microwave devices; Millimeter wave technology; Optical resonators; Optical sensors; Permittivity; Resonant frequency; Tellurium; Whispering gallery modes;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2002.804627
