左、右手材料结构吸波性能的计算机仿真

为了考察在吸波体结构设计中引入左手材料所产生的效果,提出了空气/左手介质/右手介质/金属结构吸波体模型,用传输线模型对该结构的吸波特性进行了理论分析,并用遗传算法对结构进行了优化与计算机仿真.研究结果表明,在微波垂直入射条件下,当材料整体电磁参量最优匹配时,在0.4～10 GHz频带内该结构能实现平均-12 dB的反射率.表明左手介质的引入有利于实现材料整体电磁参量的较好匹配,提高吸收峰值,拓宽吸波体的带宽.这为宽频带/多频带吸收材料的研制提供了一条可供选择的途径.

Simulations of electromagnetic wave-absorbing properties of structures consisting of left-handed and right-handed materials

To review the effect of left-handed materials in the structural design of an electromagnetic wave absorber, a wave-absorber model with a structure of air/left-handed-medium/right-handed-medium/metal was proposed. Wave-absorption properties of the structure were theoretically ana sion line model. Then structural parameters were optimized through genetic algor yzed using the transmis thms and numerical sim ulations were made. The results showed that, when the wave was normally incident and the structural electromagnetic parameters were well matched, an average reflectance of-12 dB could be achieved within the frequency range from 0. 4 to 10GHz. This means that the usage of left-handed materials allows better matching of electromagnetic parameters, increased peak values pf absorption, and the broadening of the bandwidth of absorption. Research in this paper offers a new idea for the development of wave-absorbers with broad bandwidth.