In this letter, the problem of electromagnetic scattering by a shallow elliptical-shaped cavity in a perfect electric conductor plane is considered. We propose an efficient modal approach based on the region-matching technique that can calculate scattered fields without the use of the Mathieu functions. By enforcing boundary conditions at a semicircular auxiliary border, a system of linear equations is constructed. The results obtained by this method are compared with those provided by the method of moment. Finally, the effect of the shape of the cavity on the scattering signature is investigated.

中文翻译：

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浅椭圆形腔的 TM 散射


在这封信中，考虑了完美电导体平面中浅椭圆形空腔的电磁散射问题。我们提出了一种基于区域匹配技术的有效模态方法，该方法可以在不使用 Mathieu 函数的情况下计算散射场。通过在半圆形辅助边界处施加边界条件，构建了线性方程组。将该方法获得的结果与矩量法提供的结果进行比较。最后，研究了腔体形状对散射特征的影响。