A Self-Adaptive Complex Root Tracing Algorithm for the Analysis of Propagation and Radiation Problem

An improved complex root tracing algorithm for radiation and propagation issues is proposed. The approach is based on a self-adaptive discretization of Cauchy's argument principle for a \mathbb C ×\mathbb R space and requires a reduced number of function calls in comparison to other procedures presented in the literature. A few different examples concerning propagation and radiation problems have been considered to verify the validity and efficiency of the proposed technique.