Analysis of the coupling of an incident wave with a wire inside a cavity using an FEM in frequency and time domains

This paper presents a numerical method based on finite elements in both the frequency and time domains for modeling the coupling of an incident wave with a conducting wire placed inside a metallic cavity having a small aperture. The method uses edge elements on tetrahedra for the electric field representation. The formulation can take into account thin wires as well as lumped elements. In the time-domain approach, the time derivatives are discretized by the Newmark method, which allows obtaining an unconditionally-stable scheme with second-order accuracy. Numerical results are provided to validate the presented method.

I. Introduction

When conceiving electrical or electronic systems, it is necessary to take into account the constraints of electromagnetic compatibility (EMC) in order to define the most appropriate configurations, less sensitive to perturbations. The quantification of couplings between disturbing fields and systems is essential to the analysis.