首先介绍了左手材料的基本概念，左手材料在微波频段的实现方法。
First, the concept of LHM and the methods to realize it in microwave frequency band are introduced.
应答接收机误码测试系统是在微波频段测试接收机误码率的测试设备。
The error code rate test system of answer receiver is used for testing error rate of testing receiver at microwave band.
微波技术问世已经半个多世纪，它是在微波频段通过地面视距进行信息传播的一种无线传输手段。
Microwave technology has exited for over half of the century. It transmits the information by ground visual distance in microwave frequency band. It is a kind of wireless transmission technology.
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