快速MEI算法及其在电大尺寸电磁散射问题中的应用

本文基于不变性测试方程法（ＥＭＩ）提出一种快速算法，在二维散 表面建立菜形差分网格后，通过对节点的重新排序，将原问题中的稀疏矩阵变换为带状稀疏阵，从而使占用的计算机内存和计算时间均由Ｏ（Ｎ２）下降为Ｏ（Ｎ），可以解决原来无法计算的问题，议事 成功地计算了最大周长为１００００个波长的几个电大尺寸二维柱体的电磁散射，并与矩量法、ＭＥＩ方法进行比较。

Fast-MEI Algorithm and its Application on Electrically Large Electromagnetic Scattering Problems

This paper presents a fast algorithm based on the measured equation of invariance (Fast MEI).Conformal meshes are made along the surface of two dimensional scatterer.Renumbering of nodes changed the original sparse matrix into band one,and the consumption of computer memory and CPU time decrease from O(N 2) to O(N) .Via this new algorithm,electrically large problem can now be rapidly solved.The scattering fields are computed on several 2 D cylinders with the maximum perimeter of 10,000 wave length.The results are then compared with that got by MOM and MEI.