平面上方二维介质目标对高斯波束的电磁散射研究

基于矩量法、互易性定理及镜像理论，提出了一种新的混合方法用于研究水平分界面上方二维介质目标对垂直入射高斯波束的差值散射场.应用镜像理论，介质水平分界面可被原始目标相对于该分界面的镜像目标所替代，从而给出散射问题的等效模型.在等效模型中，应用矩量法求解了原始目标及镜像目标对高斯波束的散射场，同时结合互易性定理得到了原目标与其镜像目标之间的耦合散射场.数值计算结果与相关文献方法及MoM所得结果进行了比较，验证了该混合方法的有效性. 关键词： 互易性定理 电磁散射 高斯波束 二维目标

Investigation of the scattered field from a two-dimensional dielectric target above the planar surface with a Gaussian beam incidence

Differential scattering field of vertical incident Gaussian beam from a two-dimensional target near a plane interface is studied by means of a new hybrid method based on the reciprocity theorem (RT), the image theory (IT) and the method of moment (MoM). By application of IT, the plane interface is replaced by the virtual image of the actual target, and an equivalent model of the scattering problem is presented. In the equivalent model, the scattered field from the actual target and the virtual one are numerically calculated by employing MoM, and the rescattered coupling fields between the actual target and the virtual one are evaluated utilizing the combination of MoM and RT. The numerical results of these tests are presented and compared with previously published calculations for the same problems.