Thin film Ba(0.6)K(0.4)BiO3 microwave devices
Abstract
Microwave structures utilizing superconducting thin films of Ba(0.6)K(0.4)BiO3 (BKBO) have been fabricated and tested. A high-quality BKBO thin film grown by pulsed laser deposition on a 100-plane MgO substrate was patterned into a resonator and coplanar transmission line. The 2.5-mm coplanar transmission line had an insertion loss of -2.1 dB at 20 GHz and 21 K. The resonator showed an unloaded Q (quality factor) of 230 at 15 K and 15.8 GHz. It was only possible to infer that the surface impedance Rs = 34 micro-ohms or less at 15 K, since the resonator was limited by radiation losses rather than conductor losses.
- Publication:
-
IEEE Transactions on Applied Superconductivity
- Pub Date:
- March 1993
- DOI:
- 10.1109/77.233367
- Bibcode:
- 1993ITAS....3.1559S
- Keywords:
-
- Barium Oxides;
- Deposition;
- Laser Ablation;
- Microwave Circuits;
- Microwave Resonance;
- Superconducting Films;
- Bismuth Oxides;
- Insertion Loss;
- Potassium Oxides;
- Pulsed Lasers;
- Q Factors;
- Thin Films;
- Transmission Lines;
- Electronics and Electrical Engineering