复杂目标电磁散射分析的FEM/PO-PTD方法

采用一种新的混合方法——FEM／PO-PTD法，分析计算带有腔体的电大尺寸复杂目标的电磁散射特性。该方法中，应用矢量有限元法(edge-based FEM)为基本方法，将腔体开口面上的磁场方程作为腔体内问题的边界条件引入泛函，采用物理光学法(PO)和物理绕射理论(PTD)分析电大尺寸规则目标的电磁散射特性。为了验证该方法的准确性，首先将其应用于三维无穷接地开口腔体的电磁散射特性分析，计算结果与有关文献的数据一致性很好。在此基础上，给出了带有不同介质填充腔体和吸波材料涂敷腔体的电大尺寸导体目标雷达散射截面的计算曲线。

Hybr id FEM /PO-PTD for Evaluation of ElectromagneticScattering by Complicated Objects

A hybrid technique is presented for the evaluation of electromagnetic scattering by complicated objects. This technique is based on edge-based Finite-Element Method (FEM), together with Physical Optics (PO) and Physical Theory of Diffraction (PTD). The magnetic equations on the opening of cavities were involved in the equivalent functional. A set of numerical results were presented, demonstrating the accuracy, efficiency, and capability of the technique. As practical uses of the hybrid technique, a number of original results were then provided.