Efficient Electromagnetic Analysis for Complex Planar Thin-Layer Composite Objects by a Hybrid Method

The previously developed volume-surface integral equation-based domain decomposition method (VSIE-DDM) generally requires huge matrix filling time. To alleviate this issue, the equivalent dipole-moment (EDM) method is applied to the VSIE-DDM for complex electrically large planar thin-layer composite objects. Therefore, an efficient hybrid VSIE-DDM-EDM method is developed, in which the EDM technique remarkably saves the calculation time of the VSIE-DDM matrix. In this hybrid method, a new simplified prism vector basis-based dipole model is proposed. Compared with the Schaubert-Wilton-Glisson basis-based dipole model, the proposed model significantly reduces the number of numerical integrations within the threshold for planar thin dielectrics. Furthermore, to ensure the flexibility of the solution for a variety of electromagnetic problems, two strategies for solving equations (inner-outer iteration scheme and direct-iterative hybrid method) are, respectively, adopted. Finally, the multilevel fast multipole algorithm (MLFMA) is utilized for iteration procedure. Numerical examples are shown to validate the accuracy and efficiency of the proposed method.