Contributions of the surface resistance of high-temperature superconducting films to the insertion loss of the microwave filters

Abstract

In this paper it is shown that the influence of the surface resistance of the high_temperature superconductors (HTS) on the insertion losses of the microwave filters with various poles and central frequencies was analyzed using simulat ion software for the electrical circuits. It is shown that HTS thick films or HT S thin films with relatively high surface resistance can be used to construct lo w insertion loss microwave filter with a few poles or with low central frequency . But high_quality epitaxial thin films must be used to construct low loss microwave filter with many poles (more than 8-poles) or with high central frequency (higher than 6GHz).