Ismo V. Lindell, Johannes Markkanen, Ari Sihvola, Pasi Ylä-Oijala
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引用次数: 11
Abstract
In this paper the concept of wave-guiding medium, recently introduced for planar structures, is defined for the spherically symmetric case. It is shown that a quarter-wavelength layer of such a medium serves as a transformer of boundary conditions between the two interfaces. As an application, the D′B′-boundary condition, requiring vanishing of normal derivatives of the normal components of D and B field vectors, is realized by transforming the DB-boundary conditions. To test the theory, scattering from a spherical DB object covered by a layer of wave-guiding material is compared to the corresponding scattering from an ideal D′B′ sphere, for varying medium parameters of the layer.
摘要本文对球面对称情况下的平面结构引入的导波介质的概念进行了定义。结果表明，这种介质的四分之一波长层在两个界面之间起着边界条件的转换作用。作为应用，D ' B ' -边界条件要求D和B场向量的法向分量的法向导数消失，通过对B-边界条件进行变换实现。为了验证这一理论，将一层波导材料覆盖的球形DB物体的散射与理想D ' b '球体的相应散射进行了比较，并对该层的介质参数进行了不同的比较。
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