电大散射问题的复合场积分方程快速傅里叶变换算法  

Fast Fourier transform algorithm for the combined integral equation to solve electrically large scattering problems

作　　者：陈增帅[1] 赖奔[1] 黄春明[1] 梁昌洪[1] 

机构地区：[1]西安电子科技大学天线与微波技术重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2009年第3期463-467,共5页Journal of Xidian University

摘　　要：针对电大散射问题,提出了一种基于快速傅里叶变换的新算法.整个求解区域被分成近区和远区两部分:近区部分采用传统矩量法计算;远区部分将格林函数在背景笛卡尔网格上进行拉格朗日插值,使其阻抗元素可用Toeplitz矩阵描述,并采用快速傅里叶变换加快矩阵向量积.复合场积分方程消除了电场积分方程和磁场积分方程的内谐振问题,保持了矩量法的准确性,且求解矩阵方程的迭代次数减少为电场积分方程的10%.A new fast Fourier transform-based algorithm is introduced for solving electrically large scattering problems. The entire computational domain is partitioned to near and far field couplings. The near field coupling can be computed by the traditional method of moments （MoM） ; while the impedance elements of far field coupling are characterized as a Toeplitz matrix by interpolating Green＇s function on a regular Cartesian grid, and the matrix-vector products are accelerated by fast Fourier transforms. Otherwise, the combined field integral equation （CFIE） eliminates the interior resonance problem suffered by the electrical field integral equation （EFIE） and the magnetic field integral equation （MFIE）, and maintains the accuracy of the MoM. The iteration number for solving matrix equations is reduced to 10% that of EFIE.

关 键 词：快速傅里叶变换 复合场积分方程 快速算法 电磁波散射 

分 类 号：TN011[电子电信—物理电子学]