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引言自从雷达发明以后,雷达接收机一般都是没有微波放大,而是利用晶体变频器将微波信号变成中频以后再行放大.要增加雷达的探测距离,主要的办法是靠增加雷达发射机的功率.因此十多年前全力研究大功率磁控管和速调管的制造.这种办法不是很经济的,并且功率不可能无限制地提高.另一方面由于防御导弹的远程搜索、洲际通信和射电天文学等的发展,对高灵敏度的微波接收机提出了迫切的要求,于是微波低噪声放大器受到了重视.过去数年内在这方面取得了很大的进展,发明了若干微波低噪声放大的新技术,这些新技术使微波接收机比以前有较高的灵敏度成为可能.
Introduction Since the invention of the radar, radar receivers generally do not amplify microwaves but amplify the microwave signals into intermediate frequencies by using crystal inverters. The main method to increase the detection range of a radar is to increase the radar transmitter’s Power, so more than a decade ago to study the manufacture of high-power magnetrons and klystrons This approach is not very economical, and power can not be unlimited increase On the other hand due to the long-range search of defensive missiles, intercontinental communications And the development of radio astronomy and so on, put forward the urgent request to the high sensitivity microwave receiver, so the microwave low noise amplifier has been taken seriously.Over the past few years in this respect has made great progress, invented a number of microwave low noise amplification New technologies, these new technologies make microwave receivers more sensitive than ever possible.