DDM/FEM-BIE Approach for Analyzing EM Scattering of Electrically Large Open-Ended Cavities
He Xiao-xiang①; Xu Jin-ping②
①Coll. of Info. Sci. and Tech., Nanjing Univ. of Aeronautics and Astronautics Nanjing 210016 China;②State Key Laboratory of Millimeter Waves Southeast University Nanjing 210096 China
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.