5-GHZ HIGH-TEMPERATURE-SUPERCONDUCTOR RESONATORS WITH HIGH-Q AND LOW-POWER DEPENDENCE UP TO 90K

被引：49

作者：

WILKER, C ^{[1
]}

SHEN, ZY ^{[1
]}

PANG, P ^{[1
]}

FACE, DW ^{[1
]}

HOLSTEIN, WL ^{[1
]}

MATTHEWS, AL ^{[1
]}

LAUBACHER, DB ^{[1
]}

机构：

[1] DUPONT CO,SUPERCONDUCT GRP,WILMINGTON,DE 19880

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 1991年 / 39卷 / 09期

关键词：

D O I：

10.1109/22.83818

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：

We have fabricated high-temperature superconducting films made of TlBaCaCuO (2212) and YBaCuO (123) by postdeposition annealing techniques on (100) LaAlO3 substrates. These films, especially the TlBaCaCuO (2212), exhibit a unique combination of microwave properties: high temperature operation, high Q (low surface resistance), and low power dependence. Both types of films have measured surface resistances which are better than 1/10 that of copper at 20 GHz. (These low surface resistance values are realized below 98 K for TlBaCaCuO (2212) and below 84 K for YBaCuO (123).) Microstrip resonators with a fundamental resonance frequency of 5 GHz were fabricated from these materials. The performance of our best resonator at 90 K (loaded Q > 20 000 at 5 GHz) was 50 times better than an analogous copper resonator (also measured at 90 K) and can handle more than 10 W of peak power in the resonator with only a small degradation of the Q. In addition, the shift of the resonator frequencies with temperature was fit to a two-fluid model. The parameters for TlBaCaCuO (2212) were T(c) = 101.0 K and lambda-0 = 4700 angstrom and for YBaCuO (123) were T(c) = 91.1 K and lambda-0 = 6800 angstrom.

引用

页码：1462 / 1467

页数：6

共 19 条

[1]

COOKE DW, 1989, FREQUENCY DEPENDENCE

[2] INSITU GROWN YBA2CU3O7-D THIN-FILMS FROM SINGLE-TARGET MAGNETRON SPUTTERING [J].