低噪声接收机是决定各类微波和毫米波系统性能水平的关键部件之一.长期以来,一直受到人们的高度重视.最近二十年来,随着微波毫米波技术、特别是固态器件的迅猛发展,低噪声接收机也呈现出崭新的面貌.过去在低噪声接收机中占有重要地位的那些笨重、复杂和昂贵的装置,例如量子放大器、低噪声行波管放大器和电真空器件本机振荡器,其重要性已逐渐 Low noise receiver is one of the key components to determine the performance level of various microwave and millimeter wave systems, and has been valued by people for a long time. With the rapid development of microwave and millimeter wave technology, especially solid state devices , Low-noise receivers also show a new look.Large, low-noise receivers in the past have played an important role in those bulky, complex and expensive devices such as quantum amplifiers, low-noise traveling-wave tube amplifier and electric vacuum device local oscillator , Its importance has gradually