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一、引言今天,通信技术在我们社会里是最重要、发展最迅速的工业之一。许多军事上部署的通信系统以及国家航空和航天局的通信系统都需要工作在极高频频段上的固态的低噪声接收机。除了对它们提出低噪声技术要求外,人们还要求这些接收机体积小,重量轻,并具有高可靠性。目前一种用于军事通信的低噪声接收机前端(LNR)已经研制成功,在19.9~21.5
I. Introduction Today, communication technology is one of the most important and fastest-growing industries in our society. Many of the militarily deployed communications systems and the communications systems of the National Aeronautics and Space Administration require solid-state low-noise receivers operating in the very high frequency band. In addition to providing low noise technical requirements for them, it is also required that these receivers be small, lightweight, and highly reliable. At present, a low-noise receiver front-end (LNR) for military communications has been successfully developed. Between 19.9 and 21.5