Third-order intermodulation measurements of microstrip bandpass filters based on high-temperature superconductors

摘要

The insufficient power-handling capability of high-temperature superconducting microwave filters has been a serious barrier to their application. To clarify the key parameters for improving the power-handling capability of rf filters based on high-temperature superconductors with microstrip structures, we synthesized bandpass filters with different layouts using several kinds of thin film high-temperature superconductors, and performed third-order intermodulation measurements on them. The experimental results indicate that increasing the film thickness and utilizing MBE-grown films of NdBa/sub 2/Cu/sub 3/O/sub 7/ films are effective in obtaining microstrip filters with high power-handling capability.