Title :
Cooled, ultra-high Q, sapphire dielectric resonators for low noise, microwave signal generation
Author :
Driscoll, M.M. ; Haynes, J.T. ; Horwitz, S.S. ; Jelen, R.A. ; Weinert, R.W. ; Gavaler, J.R. ; Talvacchi, J. ; Wagner, G.R. ; Zaki, K.A. ; Liang, Xiao-Peng
Author_Institution :
Westinghouse Electron. Syst. Group, Baltimore, MD, USA
Abstract :
It is shown that with high-quality, large-area YBCO films and simple, styrofoam mounts, unloaded X-band Q values of over 250 thousand are attainable for TE01 mode operation of a sapphire dielectric resonator (DR) operated at 77 K and employing high-temperature superconducting (HTS) films installed in the DR enclosure covers. Rigorous analysis for the determination of resonator frequency, modes, and unloaded Q have been carried out using mode matching techniques. The results of both analysis and prototype device evaluation experiments are compared for resonators fabricated using enclosures consisting of conventional metal sidewalls and covers using HTS films as a function of cover conductivity
Keywords :
Q-factor; cryogenics; dielectric resonators; high-temperature superconductors; microwave devices; microwave generation; sapphire; superconducting devices; superconducting thin films; 77 K; Al2O3; TE01 mode operation; YBaCuO films; cooled resonators; cover conductivity; microwave signal generation; mode matching techniques; sapphire dielectric resonators; styrofoam mounts; unloaded X-band Q values; Dielectrics; Frequency; Microwave generation; Microwave oscillators; Noise generators; Noise level; Phase noise; Signal generators; Superconducting device noise; Superconducting films;
Conference_Titel :
Frequency Control, 1991., Proceedings of the 45th Annual Symposium on
Conference_Location :
Los Angeles, CA
Print_ISBN :
0-87942-658-6
DOI :
10.1109/FREQ.1991.145970
