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本文从电磁介质的变换理论出发,提出采用开口共振环(SRR)结构的球状变形器简化方案.通过调节此微结构的几何参数,可获得有效磁导率分布,并实现TE入射波下的变形效果.有限元模拟计算的结果表明,尽管此方案中的参数经历了简化与离散,且材料本身具有不可忽略的色散及损耗,但在工作频率下仍能实现较好的变形效果.另一方面,通过选择合适的结构参数,令该结构的共振点远离结构参数的分布范围,可有效地拓宽此结构的工作频带,改善变形器的变形效果.
Based on the theory of electromagnetic medium transformation, this paper proposes a simplified scheme of spherical deformer using SRR structure. By adjusting the geometrical parameters of the microstructure, the effective permeability can be obtained and the deformation under TE incident wave can be achieved. The results of finite element simulation show that although the parameters of this scheme have been simplified and discrete, and the material itself has non-negligible dispersion and loss, it can still achieve better deformation effect at the operating frequency.On the other hand, By selecting suitable structural parameters, the resonance point of the structure is far away from the distribution range of structural parameters, which can effectively broaden the working frequency band of the structure and improve the deformation effect of the deformer.