HTS Receiver Front-End with Limiting and Self-Protective Abilities

A novel High Temperature Superconducting (HTS) receiver front-end with limiting and selfprotective abilities is proposed aiming at resolving the problems in mobile communication such as lack of frequency resources and regular channel block and so on. A novel HTS microwave filter with the function of limi-filter is adopted and located before low noise amplifier. Based on the excellent filtering and limiting abilities of HTS limi-filter, the receiver front-end with limiting and self-protective abilities is realized. Experimental results show that when input power is -10 dBm, the insertion loss of HTS limi-filter is 0.2 dB and the Standing Wave Ratio (SWR) is less than 1.4; when input power is 15 dBm, the limiting depth of signal is 10 dB. The SWR and Noise Figure (NF) of HTS receiver front-end manufactured by mixed technology is less than 0.7 dB.