电大尺寸开口腔体电磁散射特性的DDM/FEM-BIE混合法分析
DDM/FEM-BIE Approach for Analyzing EM Scattering of Electrically Large Open-Ended Cavities
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摘要: 该文将超松弛重叠及非重叠区域分裂法(DDM)与矢量有限元方法(EB-FEM)、边界积分方程(BIE)法相结合对三维电大尺寸开口腔体的电磁(EM)散射特性进行分析。通过DDM将原腔体分解成若干子腔体，在各子腔体内应用EB-FEM进行分析。腔体间应用矢量传输条件进行耦合，最终腔体内电场分布通过迭代获得。在原腔体口面，运用积分方程进行描述。在分析过程中，将传输条件和BIE统一成第三类边界条件形式。最后给出的数值结果验证了DDM/FEM-BIE混合方法分析腔体的电磁散射特性的精确性及高效性。Abstract: Edge Based Finite Element Method (EB-FEM) is combined with overlapping or nonoverlapping overrelaxation Domain Decomposition Method (DDM) and Boundary Integral Equation (BIE) for analyzing the electromagnetic (EM) scattering of electrically large open-ended cavities. The cavity is partitioned into several small subdomains. EB-FEM is applied in every subdomain. The coupling of each neighboring subdomains is realized by vector transmission condition, and the electric field distribution in the cavity is found by iteration. BIE is added on the aperture of the original cavity. Both the BIE and transmission condition are transformed into the third boundary condition. Several numerical results are presented, which demonstrate that the proposed approach is accurate and efficient for analysis of the EM scattering of open-ended cavities.
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