任意截面形状二维介质柱电磁散射特性  

Analysis of Arbitarily Shaped Two-dimensional Dielectric Cylinder Scattering Property Using Finite-element Method with Multifrontal Method

作　　者：金本喜[1] 周平[1] 

机构地区：[1]淮阴师范学院物理系,江苏淮安223300

出　　处：《淮阴师范学院学报（自然科学版）》2008年第4期275-278,283,共5页Journal of Huaiyin Teachers College;Natural Science Edition

基　　金：江苏省教育厅自然科学基金资助项目(06KJD510028)

摘　　要：应用有限元结合多波前法分析任意截面形状二维介质柱的电磁散射特性.首先利用二阶吸收边界条件来截断散射体外的无限区域,然后应用有限元法进行分析,形成待求矩阵方程,最后应用多波前法求解该方程.作为算例,分别计算了无限长介质方柱和圆柱在平面电磁波照射下的雷达散射截面,结果与有关文献一致;计算了两种形状不规则柱体的雷达散射截面.数值结果表明,使用多波前法解有限元方程,可以减少了计算时间.In this paper, the finite-element with multifrontal method is proposed for arbitrarily shaped two-dimensional dielectric cylinder scattering. First, the absorbing boundary conditions（ABC） is applied at the terminating infinite region exterior to scatterer. Then the finite-element method is used to analysis of the scattering property of the cylinder and the matrix equation is obtained. Last, the multifrontal method is applied to solve the equation. As the verification example, the radar cross section（RCS） of infinite square post and circle cylinder excited by plane wave are obtained. The results in this paper agree well with those in previous works. Based on these, the RCS of two kinds of irregularly shaped dielectric cylinders are calculated. Numerical results demonstrate that CPU time is greatly reduced by using multifrontal method to solve the finite equations.

关 键 词：有限元法 多波前法 吸收边界条件 电磁散射 雷达散射截面 

分 类 号：O441.4[理学—电磁学]