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(N2c) to O(Nc), where Nc 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.