Fast analysis of 3D inhomogeneous dielectric objects using IE-FFT

This paper presents a fast solution of electromagnetic scattering problems using the volume integral equation (VIE) combined with the integral equation fast Fourier transform (IE-FFT). The tetrahedron cells are used to model the geometry of the scatterer and the Schaubert-Wilton-Glisson (SWG) basis function is used to expand the electric flux density. A floating stencil topology is introduced to reduce the memory requirement and computational complexity for the near-interaction. Numerical result shows that the method can reduce both memory requirement and computational complexity while maintains the same accuracy.