A simple numerical solution for electromagnetic scattering from a 2-D homogeneous chiral cylinder of arbitrary cross section placed above a dielectric half-space (DHS) is presented. A modified surface equivalence principle is used to obtain coupled electric field integral equations. For feasible application of method of moments, a perturbation method is used where a strip of finite width approximates the surface of the infinite half-space. The perturbed currents on the interface are expressed as a difference of the currents with the cylinder present and the exact solution (cylinder removed). The excitation vector now contains the reflected field from the DHS in addition to the incident field. Transverse magnetic (TM) and transverse electric (TE) excitations are treated. Computed results include perturbed currents on the dielectric interface and the scattered fields. Excellent agreement is observed for special cases available in the literature.

中文翻译：

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介电半空间上方任意截面的手性圆柱体的散射

提出了一种简单的数值解决方案，用于从位于介电半空间（DHS）上方的任意横截面的二维同构手性圆柱体进行电磁散射。修改后的表面等效原理用于获得耦合电场积分方程。为了可行地应用矩量法，在宽度有限的条带近似于无限半空间的表面的情况下，使用摄动法。界面上的扰动电流表示为存在圆柱体的电流与精确解（去除圆柱体）的电流差。现在，激发矢量除了包含入射场外，还包含来自DHS的反射场。横向磁（TM）和横向电（TE）激励得到处理。计算结果包括介电界面上的扰动电流和散射场。对于文献中的特殊情况，观察到了极好的一致性。