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In this paper, the flnite-difierence frequency-domain (FDFD) method, boundary integral equation (BIE) method and sub-entire-domain (SED) basis functions are combined to analyze scatterings from flnite periodic dielectric gratings. The wavelet method is used to reduce the number of inner product operations in calculating the mutual-impedance elements between the SED basis functions. In the numerical examples, the RCS curves obtained by the method in this paper are in good agreement with those obtained by the classical full-domain FDFD method, but the computational times are largely reduced and no large matrix equation needs to be stored and solved in the former.

electromagnetic waves

ANALYSIS OF FINITE PERIODIC DIELECTRIC GRATINGS BY THE FINITE-DIFFERENCE FREQUENCY-DOMAIN METHOD WITH THE SUB-ENTIRE-DOMAIN BASIS FUNCTIONS AND WAVELETS