Effect of loss and coupling on the resonance of metamaterial: An equivalent circuit approach

Abstract

In this work we establish an equivalent circuit model to analyze the resonace of the metamaterial considering the loss of the unit cell and coupling effect between them. From this model, we find that metamaterial can be divided into three categories: weak, critical and strong couplings, depending on the values of the loss and coupling strength, where the different resonant properties are presented. The physical reason of the division is whether the loss in each unit cell can be offset by energy coupling from the adjunct unit cells. Full-wave electromagnetic simulations have also been carried out to verify the equivalent circuit analysis. Our circuit analysis provides a simple and effective way to understand the coupling of the metamaterial and gives guidance for the analysis and design of the metamaterial.

概要

创新点

人工电磁材料的结构之间存在电磁耦合, 特别是结构距离很近的时候. 这种电磁耦合以及结构的损耗对其谐振特性起很重要的影响. 本文建立了人工电磁材料的等效电路模型, 在模型中分别考虑了电场耦合和磁场耦合以及结构损耗, 并根据耦合强度和损耗值的关系, 把人工电磁材料中的谐振特性分成三类: 强耦合, 临界耦合和弱耦合. 通过对等效电路模型的分析, 得出了人工电磁材料的谐振频率的劈裂和这三类耦合之间的关系, 并从能量的角度解释了其物理机理.