Compact, Low Loss, and High Power Handling HTS Dual-Mode Double-Strip Resonator Filter With New Feeding Structure

Abstract

A compact, low loss and high power handling high temperature superconducting filter using dual-mode double-strip resonators (DSRs) was developed. We proposed new superconducting feeding structure, which was replaced from the previously reported brass center pin feeding structure, to improve insertion loss. A four-pole elliptic function dual-mode DSR filter was designed by the electromagnetic simulator based on the moment method. The center frequency and bandwidth of the filter are a 5.0-GHz and an 80-MHz. The compact filter was fabricated using YB2Cu3Oy thin films on r-Al2O3 substrates (25 mm × 25 mm). The measured frequency responses of the filter were in reasonable agreement with the simulated ones. The measured insertion loss was 0.08 dB. The measured power handling capability of the proposed filter was more than 40 W at 60 K.