MODE CONTROL OF CRYOGENIC WHISPERING-GALLERY MODE SAPPHIRE DIELECTRIC-RING RESONATORS

被引：12

作者：

SANTIAGO, DG ^{[1
]}

DICK, GJ ^{[1
]}

PRATA, A ^{[1
]}

机构：

[1] UNIV SO CALIF,DEPT ELECT ENGN,LOS ANGELES,CA 90089

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 1994年 / 42卷 / 01期

关键词：

D O I：

10.1109/22.265527

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper presents a technique for solving the mode purity problem that exists in cryogenic microwave frequency discriminators using X-band sapphire whispering-gallery mode resonators. The sapphire cavity resonates in a pair of quasi-degenerate modes split by a few kHz due to small geometrical imperfections. Since the nature and location of the geometrical imperfections are difficult to determine, variable coupling of the modes to a fixed output port results. Resonator applications require reproducible coupling to only one of these modes. This objective can be achieved by adding a larger dominant perturbation to the resonator. Results of tests show that a noncircularly-symmetric sapphire piece suspended above the resonator can provide controllable mode coupling and simultaneous frequency tuning.

引用

页码：52 / 55

页数：4