Characteristic Mode Decomposition Using the Scattering Dyadic in Arbitrary Full-Wave Solvers

TL;DR

This paper introduces a method to compute characteristic modes using the scattering dyadic, applicable to arbitrary materials, with implementations provided for various electromagnetic solvers.

Contribution

It presents a novel formulation of characteristic modes via the scattering dyadic and provides practical computational tools for different full-wave solvers.

Findings

Successfully demonstrated numerical construction of the scattering dyadic.

Applicable to dielectric and magnetic materials.

Provided wrapper functions for multiple electromagnetic solvers.

Abstract

Characteristic modes are formulated using the scattering dyadic, which maps incident plane waves to scattered far fields generated by an object of arbitrary material composition. Numerical construction of the scattering dyadic using arbitrary full-wave electromagnetic solvers is demonstrated in examples involving a variety of dielectric and magnetic materials. Wrapper functions for computing characteristic modes in method-of-moments, finite-difference time domain, and finite element solvers are provided as supplementary material.