一种用于求解双周期结构电磁散射问题的吸收边界条件

本文基于频域有限差分（ＦＤＦＤ）法分析双周期结构的电磁散射问题。以Ｆｌｏｑｕｅｔ模式吸收概念建立的截断面边界吸收条件，为解决这类三维散射问题提供了一种有用的工具。采用压缩存储方式，结合最小二乘法求解建立的稀疏矩阵方程组，对周期Ｔ－型和尖劈型吸收材料后向散射功率的计算结果等，与有关文献对比，验证了该方法的正确性。

An Absorbing Boundary Condition Applied to the Analysis of EM Scattering of Doubly Periodic Structure

An approach of FDFD method applied to the computation of microwave absorber characteristics is presented.Incorporating the concept of Floquet's mode absorption to deal with the absorbing boundary condition (ABC),it provides a very useful and practical tool for analyzing 3D electromagnetic scattering of periodic profile.This method adopts compressed memory and least square method to solve the equations with sparse coefficient matrix,and is proved to be accurate and reliable compared with the reported data.