金属线对结构中左手材料特性的实验验证

Experimental Verification of Left-handed Property of Metal Cut-wire Pairs

设计了由金属线长线对和金属短线对构成的复合结构左手材料。利用数值仿真和参数反演的方法获取并讨论了结构的等效电磁参数。实验测量了复合结构左手材料的传输特性和相位特性随厚度的变化,通过对仅有长线、仅有短线和复合结构的传输特性的对比,以及复合结构相位随厚度的反常变化,验证了复合结构为左手材料。结构的色散关系曲线从另一个角度进一步验证了其左手特性。并且这几种方法的结果相互吻合。

The left-handed materials composed of metal long-wire and short-wire pairs are designed and fabricated.By using simulation and parameter retrieval procedure,the effective electromagnetic parameters are obtained and left-handed regime is found.In the experiment,the transmission spectrums and the phase delay of the composite with different number of layers are measured;the results both confirm the left-handed property of the composite.Furthermore,the dispersion relations of the structures are analyzed to verify the left-handed property of the composite in another way.The results of all the four methods above agree with each other.