Abstract
Abstract This paper introduces the Characteristic Mode Analysis in the computation of electromagnetic resonant modes in conducting bodies. Canonical cases (thin wire and a rectangular plate) are analyzed, along with real-world complex structures, a mobile phone chassis and an unmanned aerial vehicle. Given the analogy to other areas, such as modal analysis in Differential Equations, this method can be another tool when teaching Electromagnetic Radiation and antenna related topics.
Highlights
The Characteristic Mode Analysis (CMA) generates a set of orthogonal real currents on a conducting body with arbitrary geometry
This paper introduces the Characteristic Mode Analysis in the computation of electromagnetic resonant modes in conducting bodies
The theory fell into disuse later [3], appearing again in the technical literature only during the first decades of 2000, taking advantage of tools offered by commercial 3D field solvers that had this option available, especially the ones which were based on the Method of Moments (MoM)
Summary
The Characteristic Mode Analysis (CMA) generates a set of orthogonal real currents on a conducting body with arbitrary geometry. Similar to Fourier Series Expansion, where a sum of orthogonal harmonic functions (sines and cosines) describes arbitrary waveforms, CMA expresses the existing current patterns in a body using its natural modes of resonance. Those modes are, dependent on the body geometry and independent of the excitation. Given the similarity to other resonant cases previously seen in classroom by STEM courses, such as a guitar string (1D) [5], drum/membrane modes (2D), as solutions to Differential Equations (Modal Analysis) [6], the use of CMA to introduce a physical insight into radiation and antenna cases seems to be attractive for undergraduate programs
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