FEM-BEM-DDM for Electromagnetic Radiation Analysis of Periodic Antenna Array

In this paper, a simplified non-conformal domain decomposition (NDDM) modeling method is presented for analyzing periodic antenna array based on the hybrid finite element-boundary element method (FEM-BEM). The antenna array is partitioned into several sub-domains with the proposed NDDM, and each domain is solved by FEM. The exterior surface of air layer is solved by BEM. For large scale antenna array, due to the periodicity of antenna units in the direction of expansion, all of the finite element sub-domains could be obtained by using the nine characteristic sub-domains, and the couplings of sub-domains are transferred by the second order transmission condition. Numerical examples are presented, and the comparisons of simulation results with conformal DDM confirm the accuracy and efficiency improvement of NDDM.