各向异性材料部分涂覆导体的散射特性研究

Scattering characteristic of conducting targets with partially-coated anisotropic medium

利用物理光学法(PO)与有限元法(FEM)混合方法,研究了有各向异性媒质局部涂覆的电大导体目标的电磁散射问题。在有复杂媒质涂覆的电小结构区域采用有限元法,在未涂覆媒质的电大导体区域采用物理光学法结合等效电磁流法。将两部分区域的边界进行消隐处理,考虑耦合效应,并利用共同的等相位面,将不同区域产生的散射场矢量叠加得到总散射场。文中的实例结果与传统的FEM很好的一致,说明了该方法的有效性和精确性。

The scattering by electrically large conducting targets with partially-coa- ted anisotropic medium is studied by the hybrid method of finite elements method （FEM）and physical optics（PO）method. FEM is applied in the region which is coated with complicated medium, while PO and equivalent edge currents method are used for those of electrically large conducting target. Considering the coupling of two regions, the shadow regions of the boundary surface are eliminated. The common constant phase front of scattered fields from two regions is chosen to unify their phases. Therefore, the vector scattered fields can be superposed to calculate the RCS of the target. The numerical results show that this method is efficient and accurate.