介质覆盖导体柱散射特性分析

应用有限元-边界元耦合法计算任意截面形状二维介质覆盖导体柱的雷达散射截面，对介质柱内、外区域分别应用有限元和边界元法进行分析，然后通过场的连续性进行耦合，形成待求矩阵方程，最后应用内观法结合多波前法求解该方程．作为算例，分别计算了无限长介质覆盖导体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，在此基础上计算了两层介质覆盖导体方柱和圆柱的雷达散射截面．结果表明，由于使用了内观法结合多波前法求解非对称稀疏矩阵，大大减少了计算时间．

Analysis of Scattering Property for Conducting Bodies Coated with Dielectric

In this paper,the coupling of finite element method(FEM) and boundary element method(BEM) is used to calculate radar cross section(RCS) of arbitrarily shaped two-dimensional conducting bodies coated with dielectric.The interior problem involving dielectric is solved by FEM and the exterior problem is solved by BEM.Then the coupling of the field's continuty obtains the matrix equation.Last,the inward-looking approach and multifrontal method are applied to solve the equation.As the verification example,the RCS of infinite square post and circular post excited by plane wave is obtained.The results in this paper agree well with those in previous references.Based on these,the RCS of metal square post and circular post coated with two layers dielectric is calculated.Numerical results demonstrate that CPU time is greatly reduced by using inward-looking approach and multifrontal method to solve the equation.