Properties of metamaterial based electromagnetic absorbers and shields

A. Pekmezci, L. Sevgi
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引用次数: 2

Abstract

Metamaterials are widely investigated as nominates for absorbers and shields in Electromagnetic Compatibility (EMC) techniques. Due to the dispersive nature of artificially constructed metamaterials, permittivity and/or permeability can be negative at a certain band of frequency. Since the propagation constant has imaginary values in lossless SNG media, electromagnetic waves decay in these media and reflect at the surface. When the permittivity and permeability values are both negative, propagating waves are supported and impedance matching between a double negative (DNG) medium and air can be achieved. For this reason, single negative (SNG) materials can be used in electromagnetic shielding applications and DNG materials for realization of electromagnetic (EM) absorbers. Theoretical analysis of metamaterial (MTM) based electromagnetic absorbers and shields are investigated using S- parameter calculations, and properties are presented as a function of layer compositions and different dispersion parameters of medium permittivity and permeability values. The characteristics of EM absorber/shields are also observed when metamaterial layers are stacked on a metal plate.
基于超材料的电磁吸收和屏蔽性能
超材料作为电磁兼容(EMC)技术中的吸收和屏蔽材料,受到了广泛的研究。由于人工构造的超材料的色散特性,介电常数和/或磁导率在某一频率波段可能为负。由于无损煤制天然气介质中的传播常数具有虚值,因此电磁波在这些介质中衰减并在地表反射。当介电常数和磁导率均为负时,支持传播波,实现双负介质与空气的阻抗匹配。因此,单负极(SNG)材料可用于电磁屏蔽应用,DNG材料可用于实现电磁(EM)吸收器。利用S参数计算方法对基于超材料(MTM)的电磁吸收和屏蔽材料进行了理论分析,并给出了其性能与层组成、介质介电常数和磁导率等不同色散参数的函数关系。当超材料层堆叠在金属板上时,也观察到电磁吸收/屏蔽的特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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