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开口共振环型球状变形器的设计与模拟
Design and simulation of a spherical electromagnetic reshaper with a split-ring-resonator microstructure
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摘要: 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.Abstract: Reduced permittivity and permeability profiles are proposed based on the electromagnetic transformation theory to achieve spherical reshapers with a split-ring-resonator（SRRs） microstructure. The effective radial permittivity distribution depending on the structure parameters, is obtained to implement a reshaper impinged by a TE incident wave. Finite-element simualtions are carried out and the results show that a good reshaping effect can be achieved at a working frequency despite the reduced and the discreted material parameters as well as unneglectable dipersion and loss effects. And the frequency band can be broadened by choosing proper microstructures such that the resonance point is far from the distribution range of the structural factors.
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