Fast fill-in of impedance matrix in the accurate subentire domain basis function method for large-scale planar periodic structures

A fast fill-in technique of impedance matrix in the accurate subentire domain basis function method for analyzing large-scale planar periodic structures is presented. By using the proposed technique, the generation time can be reduced from O(N²_c) to O(N_c), where N_c is the number of unit cells in the total periodic structure. To validate the accuracy and efficiency of the proposed method, several numerical examples are given.