Multipoint excitation in the FDTD eigenmode port template generation

Abstract

Proper waveguide template excitation in EM simulations is one of the key factors to perform fast and accurate FDTD modelling. In some special, but practical cases, the well-known template generation method [1] with one point excitation can lead to numerical problems: it can be ill-conditioned and/or slow. In this paper, it is presented how to improve numerical conditions by exciting 2D waveguide template using a set of excitation points.