Application of the FFA technique for efficient near-field evaluation for electrically large PEC structures

The purpose of this paper is to discuss the application of the far field approximation (FFA) technique to a method of moments (MoM) formulation based on triangular surface patches for electromagnetic problems involving large perfectly conducting (PEC) structures. The generality of the original MoM is kept intact but the computer storage and processing requirements are drastically decreased using the FFA. It will be shown that the computed near-field results from such a scheme compare very well to the original MoM technique