限幅自保護(hù)高溫超導(dǎo)接收機(jī)前端研究

提出了一種新型的、具有限幅自保護(hù)功能的新型高溫超導(dǎo)高性能接收機(jī)前端系統(tǒng)方案。采用將高溫超導(dǎo)限幅濾波器前置于低噪放進(jìn)行混合集成，利用高溫超導(dǎo)限幅濾波器優(yōu)異的濾波和限幅特性實(shí)現(xiàn)同時(shí)具有高靈敏度和自保護(hù)功能的接收機(jī)前端。實(shí)驗(yàn)結(jié)果表明該濾波器可以有效地保護(hù)后端的低噪放不被燒毀或阻塞。采用超導(dǎo)-常規(guī)電路混合集成工藝研制而成的限幅自保護(hù)高溫超導(dǎo)接收機(jī)前端具有優(yōu)異的接收靈敏度，總噪聲系數(shù)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.