Fast analysis of electromagnetic scattering of 3-D dielectric bodies with augmented GMRES-FFT method

The problem of electromagnetic scattering by three-dimensional dielectric bodies is formulated in terms of a weak formulation of the domain-integral equation. Applying Galerkin's method with rooftop functions as basis and testing functions, the integral equation can be solved by the Krylov-subspace iterative fast Fourier transform (FFT) methods. However, poor convergence is observed when the relative perimittivity of the scatterer becomes large. In order to relieve this trouble, an augmented generalized minimum residual method (AGMRES) is presented. Comparisons between several typical iterative methods are made to show the efficiency of our proposed method. Index Terms--Augmented generalized minimum residual method (AGMRES), electromagnetic wave scattering, fast Fourier transform (FFT), Krylov-subspace iterative methods.