基于平行金属条的左手结构设计与仿真研究

Design and simulation of left-handed-property structure based on parallel metallic slabs

基于双平行金属线结构,将金属线宽度增大,变为金属条,同时在金属条结构单元中部引入缺口,使中部变细.由于等离子体效应,该双平行金属条结构在一定频段等效介电常数为负;又由于单元结构中部较细,使得该结构在一定频率会发生强烈的磁谐振.通过模拟仿真研究发现这种结构在X波段可以实现ε和μ同时为负.出现双负(ε<0,μ<0)的频段会随着谐振频率的变化而变化.理论分析表明谐振频率与金属条宽度、缺口高度及中部宽度有关,仿真结果同分析一致.

The structure of the parallel metallic slabs with middle-part-indentation is based on the parallel metallic wires. The permittivity of the structure is negative in a certain frequency range because of the effect of the plasma. And the strong magnetic resonance occurs in the special frequency range because the middle-part-indentation is introduced in the parallel metallic slabs. The result of simulation shows that the structure composed of ceramic alumina has negative permittivity and permeability in the X- band. The range of the double negative （ ~ 〈 O,/~ 〈 O） varies with the resonance frequency. Theoretical analysis, which is in agreement with the results of simulation, indicates that the resonance frequency is related with the width of metallic slaps, height of indentation and the width of the middle-part of the structure.