Error analysis for the contour-FFT based Green's function evaluation

A novel approach based on the Method of Moments has been recently presented to analyse very large irregular arrays printed on layered substrates. However, that method requires some tuning to minimize the error in the layered medium Green's functions while presenting a low computation time. In this work, an analysis of the influence of every parameter on these two figures of merit is presented for 2D free-space, and a simple algorithm is provided to automatize the tuning procedure. The procedure is then validated for 3D layered structures.