Title :
High T/sub c/ superconductor-sapphire microwave resonator with extremely high Q-values up to 90 K
Author :
Shen, Z.-Y. ; Wilker, C. ; Pang, P. ; Holstein, W.L.
Author_Institution :
Du Pont Central Res. & Dev., Wilmington, DE, USA
Abstract :
Several high-temperature-superconductor-sapphire TE/sub 011/ mode resonators were designed, fabricated, and tested. At 5.552 GHz, Q/sub 0/ reached 2*10/sup 6/ at 90 K, 3*10/sup 6/ at 80 K, and 1.4*10/sup 7/ at 4.2 K with circulating power up to 500 kW. Formulas for calculating the resonant frequency and Q-value were derived. These theoretical results showed good agreement with the experimental measurements. Applications such as frequency-stabilized oscillators and filters, and the characterizations of high-temperature superconductor films are discussed.<>
Keywords :
Q-factor; high-temperature superconductors; resonators; sapphire; solid-state microwave devices; superconducting microwave devices; superconducting thin films; 4.2 to 90 K; 5.552 GHz; 500 kW; Q-value; TE/sub 011/ mode resonators; Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub 8/ films; filters; frequency-stabilized oscillators; high-temperature superconductor films; microwave resonator; resonant frequency; Copper; Frequency measurement; High temperature superconductors; Oscillators; Resonant frequency; Resonator filters; Superconducting films; Superconducting microwave devices; Surface resistance; Testing;
Conference_Titel :
Microwave Symposium Digest, 1992., IEEE MTT-S International
Conference_Location :
Albuquerque, NM, USA
Print_ISBN :
0-7803-0611-2
DOI :
10.1109/MWSYM.1992.187943
