TlCaBaCuO high Tc superconducting microstrip ring resonators designed for 12 GHz
Abstract
Microwave properties of sputtered Tl-Ca-Ba-Cu-O thin films were investigated by designing, fabricating, and testing microstrip ring resonators. Ring resonators designed for 12 GHz fundamental resonance frequency, were fabricated and tested. From the unloaded Q values for the resonators, the surface resistance was calculated by separating the conductor losses from the total losses. The penetration depth was obtained from the temperature dependence of resonance frequency, assuming that the shift in resonance frequency is mainly due to the temperature dependence of penetration depth. The effective surface resistance at 12 GHz and 77 K was determined to be between 1.5 and 2.75 mOmega, almost an order lower than Cu at the same temperature and frequency. The effective penetration depth at 0 K is approximately 7000 A.
- Publication:
-
Solid State Technology Branch of NASA Lewis Research Center: Fifth Annual Digest
- Pub Date:
- August 1993
- Bibcode:
- 1993sstb.nasa..209S
- Keywords:
-
- High Temperature Superconductors;
- Microstrip Devices;
- Microwave Equipment;
- Resonators;
- Thallium Compounds;
- Fabrication;
- Q Values;
- Resonant Frequencies;
- Temperature Dependence;
- Thin Films;
- Electronics and Electrical Engineering