Design and investigation of microwave bandpass filters for L- and R- frequency bands based on high-temperature superconducting films

摘要

The microstrip hairpin half-wave 9-pole bandpass YBCO filter for L, R-band and bandwidth about 3% has been designed and manufactured from double-sided YBCO film on 2" sapphire wafer with CeO{sub}2 buffer sublayer. The designed housing gives minimum contribution of a normal metal to the surface resistance of HTS films. The microwave power loss in the designed filter in a copper housing at 1.7 GHz was 0.7dB at 77 K.