Analysis of scattering by finite periodic dielectric structures using TFQMR-FFT

In this letter, the scattering of finite periodic dielectric structures is analyzed using the volume-integral moment method enhanced by the transpose-free quasiminimal residual (TFQMR) algorithm and fast Fourier transforms (FFTs). To efficiently use TFQMR-FFT, the convergent rate and accuracy of the TFQMR-FFT related to mesh division are numerically investigated for this special structure. An approach to determine reflection coefficients from the bistatic radar cross section (bi-RCS) is presented. Various numerical results are given to demonstrate the scattering characteristics of finite periodic dielectric structures.