Solving EM Scattering From Multiscale Coated Objects With Integral Equation Domain Decomposition Method

This letter presents a nonconformal nonoverlapping integral equation domain decomposition method with impedance boundary condition (IE-DDM-IBC) to simulate electromagnetic scattering from multiscale coated objects. The proposed IE-DDM-IBC decomposes a multiscale coated object into nonoverlapping subdomains so that each subdomain can be independently meshed according to its geometrical feature. Besides rendering flexible mesh generation, the proposed IE-DDM-IBC also facilitates the derivation of an effective preconditioner that significantly accelerates the convergence of iterative solvers.