First, the concept of LHM and the methods to realize it in microwave frequency band are introduced.
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。
Negative refractive index materials are artificial materials with permittivity and permeability both negative within certain microwave frequency band.
负折射率媒质是一种人造媒质，在某一微波波段内其介电常数和磁导率同时为负值。
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.
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。
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