1. Resonances of Characteristic Modes for Perfectly Conducting Objects
- Author
-
Pasi Ylä-Oijala, Joni Lappalainen, Dimitrios C. Tzarouchis, and Ari Sihvola
- Subjects
perfect electric conductor ,Field (physics) ,010103 numerical & computational mathematics ,02 engineering and technology ,Type (model theory) ,01 natural sciences ,Magnetic resonance imaging ,internal resonance ,0202 electrical engineering, electronic engineering, information engineering ,Strong duality ,0101 mathematics ,Electrical and Electronic Engineering ,Electric field integral operator ,Integral equations ,Cavity resonators ,Eigenvalues and eigenvectors ,Mathematics ,Resonant frequency ,Eigenvalues and eigenfunctions ,ta114 ,Mathematical analysis ,magnetic field integral operator ,020206 networking & telecommunications ,theory of characteristic modes ,Integral equation ,Connection (mathematics) ,Maxima and minima ,Antennas ,Perfect conductor ,external resonance - Abstract
Resonances, i.e., extrema of the eigenvalues of characteristic modes for closed perfectly conducting objects are investigated. The characteristic modal solutions based on the electric, magnetic, and combined field integral operators (EFIO, MFIO, and CFIO) are studied and compared with analytical solutions for a sphere. All these formulations are found to capture both external (radiating) and internal (cavity) resonances predicted by the analytical expressions. At the internal resonances, the eigenvalues obtained with the EFIO- and MFIO-based approaches are not correct, and the corresponding modes are nonunique. These solutions also exhibit a strong duality between the electric (TM) and magnetic (TE) type modes. A connection is found between the external and internal resonances and the condition numbers of the matrices. The modal expansion of the CFIO-based solution is correct, even though it also experiences the nonuniqueness of the EFIO- and MFIO-based solutions.
- Published
- 2017