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前言微波系统在中继通信和军事部门中应用时通常成本很高。这类设备的产量很少超过几百台,其中还有很多部件是按规格定制的。随着用于家庭电视和特种业务的直播广播卫星的发展,出现了新的微波组件市场。如果能把价格降低到人们可接受的水平,那么微波组件市场将会和录相机、个人计算机等电子设备的市场相比拟。还可预料,一旦有了低廉的微波分系统,则它们在军用和民用两个领域中均会获得新的应用。微波分系统包含有源和无源两种元件,要使整体的生产成本降到人们接受的水平,就必须对有源元件和无源元件都采用降低成
Introduction Microwave systems are often costly when used in relay communications and the military. The output of such devices is rarely more than a few hundred, many of which are custom-made. With the development of live broadcast satellites for home television and specialty services, a new microwave component market has emerged. If the price can be lowered to an acceptable level, then the microwave component market will be compared with the market of video cameras, personal computers and other electronic devices. It is also expected that once low-cost microwave subsystems are available, they will find new applications in both military and civilian applications. Microwave subsystem includes both active and passive components, in order to make the overall production cost down to the level accepted by people, it is necessary to active components and passive components are reduced to