带有裂缝的电大尺寸目标电磁散射特性分析

提出了一种分析计算带有裂缝的电大尺寸复杂目标电磁散射问题的混合方法-FEN／PO-PID方法，在该方法中，采用基于棱边的有限元法(Edge-based FEM)为低频方法，物理光学法与物理绕射理论(POPTD)为高频方法，通过耦合技术将二者结合在一起．将此方法用于带有裂缝的二维导电柱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．还给出另外两种截面的二维导电柱体雷达截面的计算曲线．理论分析与计算结果表明，该法与其它计算同类问题的方法相比，能节省计算机存储单元、提高计算速度。

The Evaluation of Electromagnetic Scattering by Electrically Large Bodies with Carcks

A hybrid technique is presented for the evaluation of electromagnetic scattering by electrically large bodies with cracks on their surfaces. This technique employs the edge-based finite-element method (FEM) to compute the scattering from the cracks, and PO and PTD to compute the scattering from the large bodies with the cracks filled with perfect conductors. A coupling scheme is then developed to combine these two methods. Several sets of numerical results are presented, demonstrating the accuracy, efficiency, and capability of the technique. As practical uses of the hybrid technique, two perfectly conducting cylinders with different cross-sections have been analyzed. Some new numerical results are presented. It shows that the hybrid technique has some advantages over other methods in regard to saving computer memory units and CPU time.