介质金属混合目标电磁特性的一种快速分析方法

A fast algorithm for electromagnetic scattering by composite dielectric and metallic objects

用体面电流连续性方法(VSCCM)和特征基函数方法(CBFM)的复合方法分析介质金属混合目标的电磁散射特性.体面电流连续性方法是在介质与金属交界面处施加电流连续性方程,在矩量法矩阵方程中建立体电流系数与面电流系数的约束关系,减少矩阵方程中待求未知量数目.特征基函数方法是通过对目标体分块来减小矩量法矩阵方程的维数,可大幅度节省矩量法的内存需求.复合方法具有减少矩量法计算时间和内存需求的优点,数值算例证明其计算精度和效率.

A hybrid method, volume surface current continuity method （VSCCM） and characteristic basis function method （ CBFM）, is presented for the analysis of electromagnetic scattering by compos ite dielectric and metallic objects. An equation contains the restriction relation between the volume and surface current coefficient in method of moments （MoM） is derived from the current continuity equa tion at those parts where the conducting surface is in contact with the dielectric material. The VSCCM can considerably reduce the unknowns required to be solved in MoM. The CBFM can reduce the di mension of the impedance matrix by grouping the unknowns and a key feature of this method is to re duce the memory requirements significantly in MoM. The hybrid method have the merits in both reduc ing computation time and saving memory requirements in MoM. Numerical results demonstrate the computational accuracy and efficiency.