含腔电大尺寸导体目标电磁散射的一体化数值模拟

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. 关键词： 含腔目标 电磁散射 混合场积分方程 数值分析

Globalized numerical modeling of electromagnetic scattering from conductive targ ets with open cavity and electrically large size

In this paper, the electromagnetic scattering from conductive target with open cavity has been simplified as two (inner and outer) equivalent models by using the equivalence principle and introducing an equivalent magnetic current in the aperture of the cavity. For the inner part of the cavity, the equivalent conductance matrix has been obtained by use of connection scheme. Approximate boundary in tegral method has been used to describe the coupling between inner and outer pa rts of the cavity, and to obtain the aperture equivalent magnetic current. Final ly, the general combined field integral equation was presented to form the elec tromagnetic model of the scattering problem, and the multilevel fast multipole a lgorithm was used to solve this problem efficiently. Numerical examples show go od agreement between calculated results and measured data.