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特征基函数方法利用特征值分解提取目标散射特征,构造基于特征向量的基函数可以高效的缩减矩量法分析所需的未知量数目,有利于分析有限周期阵列电磁散射或辐射问题。然而,对于电大尺寸电磁阵列散射问题,直接求解由特征基函数组成的矩阵方程,仍然面临着计算量较大等问题,难以适用于单机计算。本文结合特征基函数和预修正傅里叶快速算法求解体面结合积分方程,分析了大型金属介质混合有限周期阵列的散射特性,该算法有效减少了计算量和计算时间,并且改善了迭代求解收敛性能。
The method of eigenvalue extraction uses the eigenvalue decomposition to extract the target scattering features. Constructing the basis function based on eigenvectors can efficiently reduce the number of unknowns needed by the method of moment analysis, which is helpful to analyze the electromagnetic scattering or radiation of finite periodic array. However, for the electromagnetic scattering problem of large size electromagnetics, solving the matrix equation composed of the characteristic basis functions directly is still facing the problem of large amount of calculation and so on, so it is difficult to apply it to stand-alone calculation. In this paper, we combine the characteristic basis function and the pre-corrected Fourier fast algorithm to solve the integral integration integral equation, and analyze the scattering characteristics of the mixed finite periodic array in large-scale metal media. This algorithm reduces the computation and computation time effectively and improves the convergence performance .