The time‐domain finite‐element method (TDFEM) is extended to study the two‐dimensional transient electromagnetic scattering from multiple targets above a rough surface in this article. The perfectly matched layer is employed as the truncation boundary of TDFEM region to absorb the outward wave scattered from the model. To introduce the incident wave, a total field boundary, which splits the whole region into total‐ and scattered‐field regions is built around the composite model. To model the composite scattering, the total‐ and scattered‐field formulas are used in these two regions, respectively. Numerical results are presented to demonstrate the accuracy, efficiency, and flexibility of the method. The results show that the proposed method is significantly superior to the time‐domain integral equation method in terms of solving time.

中文翻译：

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时域有限元-PML研究粗糙表面上方多个目标的瞬态电磁散射

本文扩展了时域有限元方法（TDFEM），以研究来自粗糙表面上方多个目标的二维瞬态电磁散射。完美匹配的层用作TDFEM区域的截断边界，以吸收从模型散射的向外波。为了引入入射波，围绕复合模型建立了一个总场边界，该边界将整个区域分为总场和分散场区域。为了对复合散射建模，分别在这两个区域中使用了总场和散射场公式。数值结果表明了该方法的准确性，效率和灵活性。结果表明，该方法在求解时间上明显优于时域积分方程法。