电磁超材料中负磁导率对负介电常数的影响

Effect of negative permeability on negative permittivity in electromagnetic metamaterials

为深入了解电磁超材料中物质间相互作用关系,理论分析了金属导体线阵列宏结构嵌入单负磁导率媒质中时其等效介电常数的变化特性。数值计算和电磁仿真方法相结合,讨论了单负磁导率媒质和单负介电常数媒质的相互作用关系,提出了减小其相互作用的解决方法。仿真结果显示:将金属线阵列直接嵌入到单负磁导率媒质中时,电磁超材料传输特性在整个频段内为传输禁带;将金属线裹附一层绝缘材料后,传输禁带变为传输通带,这表明金属线阵列和单负磁导率媒质之间必须加入一种绝缘材料才能合成双负的电磁超材料。

For further understanding of the interactions between different materials in the electromagnetic metamaterials,the change characteristics of the effective permittivity of wire array embedded in a single negative permeability medium were analyzed theoretically.The interactions between the single negative permittivity and single negative permeability were investigated using both numerical calculation and electromagnetic simulation methods.The strategy of reducing such interactions was also proposed.The simulation results indicate that the wire array embedded directly in the single negative permeability medium exhibits only transmission forbidden band in the whole frequency band.While the wires are cladded with dielectric insulation materials,the above forbidden band turns into transmission pass band.It implies that the wire array and the single negative permeability medium must be insulated by dielectric materials to compose metamaterials.