L-band small high-sensitivity microwave receiver module using superconducting filter

We have developed an L-band small high-sensitivity microwave receiver module using a superconducting filter. An L-band superconducting filter for a small microwave receiver module is designed as a four-pole elliptic function filter. The resonator uses a stepped-impedance hairpin microstrip line resonator. The developed superconducting filter uses high-Tc superconducting material, YBCO. The fabricated superconducting filter had a low insertion loss of 0.1dB. We have fabricated a small microwave receiver module in which the designed filter is mounted in a cryocooler. The volume of the fabricated module was 2 liters. In addition, the noise figure of the microwave receiver module was 0.5dB. We have demonstrated the receiver module with high sensitivity and small size.