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应用等效原理 ,通过引入口面上等效磁流将含腔导电目标电磁散射简化为腔内、外两个等效问题 .腔内问题分段求解并应用级联法获得口面等效导纳矩阵 ;腔内外的耦合关系应用近似边界元方法描述并由此获得口面等效磁流 ;最后 ,这一具有混合源的腔体内外一体化散射问题则应用所提出的广义混合场积分方程方法建立电磁模型 ,并用多层快速多极子方法实现高效数值求解 .实例计算结果与测试结果具有很好的一致性 .
By applying the equivalent principle, the equivalent electromagnetic flow in the cavity surface can be used to simplify the electromagnetic scattering of the conductive target in the cavity into two equivalent problems, that is, the inner cavity and the outer cavity. The intracavity problem is solved in stages and the cascade method is used to obtain the equivalent surface conduction Nanomatrix; the coupling relationship between the inside and outside of the cavity is described by using the approximate boundary element method and the equivalent magnetic flux of the mouth surface is obtained; finally, the integrated scattering problem inside and outside the cavity with mixed sources is solved by using the generalized mixed field integral equation Methods The electromagnetic model was established, and the multi-layer fast multipole method was used to realize high-efficiency numerical solution. The calculated results of the examples were in good agreement with the test results.