A fast hybrid DFT-MoM for the analysis of large finite periodic antenna arrays in grounded layered media

A number of techniques and algorithms have been developed in the literature to reduce the computational time and also to overcome the memory storage limitations for solving large problems. In this work, a hybrid DFT-MoM approach has been developed to reduce the number of unknowns in the treatment of large finite arrays by using the DFT for representing the global array distribution. Due to the compactness of the DFT spectrum of global array current distribution for most typical array excitations, the number of unknowns can be reduced; hence reducing the computational time and memory storage requirements for the analysis of large finite arrays.