An effective solution method is proposed to analyze the electromagnetic scattering problem of coated targets, which is based on a novel form of multilevel matrix decomposition algorithm (NFMLMDA). It uses an efficient directional grouping scheme to subdivide the far-field domain, and then a novel distribution form of equivalent source is applied to reduce the matrix filling time and memory requirement. By using the grouping scheme, the far-field interaction domain can be divided into many cone structures. The matrix between the observation group and far-field group in the cone structure is low-rank, which meets the directional far-field requirement. Meanwhile, the impedance boundary condition (IBC) is applied to simplify the solution process and improve the accuracy of the approximate solution. The method of this paper is very suitable for the needs of various kinds of complex problems.

中文翻译：

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使用表面阻抗边界条件的快速算法高效地分析涂层物体

基于一种新型的多级矩阵分解算法（NFMLMDA），提出了一种有效的解决方法来分析被覆目标的电磁散射问题。它使用一种有效的方向分组方案来细分远场域，然后应用一种等效源的新型分布形式来减少矩阵填充时间和存储需求。通过使用分组方案，可以将远场交互作用域划分为许多圆锥结构。锥状结构中观测组与远场组之间的矩阵为低秩，满足定向远场要求。同时，采用阻抗边界条件（IBC）简化求解过程并提高近似解的精度。