摘要
A hybrid technique is developed for the evaluation of two dimensional electromagnetic scattering from electrically large conducting bodies with cracks on their surfaces (TE case). The edge based finite element method (FEM) is employed to compute the scattering from the cracks. Physical optics (PO) and physical theory of diffraction (PTD) are utilized to evaluate the scattering from the large bodies with the cracks filled with perfect conductors. These two methods are combined by an efficient coupling scheme. Some of numerical results are presented. It is shown that the hybrid technique has some advantages over other methods in regard to saving computer memory units and CPU time.
提出了一种分析计算带有裂缝的二维电大尺寸复杂导体目标电磁散射问题的混合方法—— FEM/ PO-PTD方法。该方法采用基于棱边的有限元法 ( Edge-basedFEM)为低频方法 ,物理光学法与物理绕射理论 ( PO-PTD)为高频方法 ,通过耦合技术将两者结合在一起。本文将该方法应用于带有缝隙的二维导电柱 TE模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 ,从而验证了该方法的准确性。文中还给出了另外几种截面的导电柱体雷达截面的计算曲线。理论分析与计算结果表明 ,本文提出的混合方法与其他计算同类问题的方法相比 ,能节省计算机存储单元。
基金
江苏省"青蓝工程"跨世纪学术带头人培养人选基金资助项目~~
