We report the successful fabrication of a five-pole interdigital stripline filter made of the 93 K superconductor Y1Ba2Cu 3Oy coated on a silver substrate, with a center frequency of 8.5 GHz and an extremely high rejection ratio of 80 dB. The lowest insertion loss measured was 0.1 dB at 12 K, with a return loss better than 16 dB, representing significant improvements over a similar Cu filter, and comparable to low Tc filters. The insertion loss appears to be limited by extrinsic factors such as tuning mismatch and joint losses, and not by the superconducting material losses.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)