限幅自保护高温超导接收机前端研究

提出了一种新型的、具有限幅自保护功能的新型高温超导高性能接收机前端系统方案。采用将高温超导限幅滤波器前置于低噪放进行混合集成，利用高温超导限幅滤波器优异的滤波和限幅特性实现同时具有高灵敏度和自保护功能的接收机前端。实验结果表明该滤波器可以有效地保护后端的低噪放不被烧毁或阻塞。采用超导-常规电路混合集成工艺研制而成的限幅自保护高温超导接收机前端具有优异的接收灵敏度，总噪声系数小于0.7 dB。

A novel High Temperature Superconducting (HTS) receiver front-end with limiting and self- protective 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.