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hal-00637749, version 1

Low-frequency interaction of magnetic dipoles and perfectly conducting spheroidal bodies in a conductive medium

Panayiotis Vafeas () 1, Gaële Perrusson () 2, Dominique Lesselier () 2

Advanced Topics in Scattering and Biomedical Engineering, Proc. 8th International Workshop on Mathematical Methods in Scattering Theory and Biomedical Engineering World Scientific Publishing Company (Ed.) (2008) 107-114

Abstract: This work concerns the interaction of a time-harmonic magnetic dipole, arbitrarily orientated in the three-dimensional space, with a perfectly conducting prolate or oblate spheroidal body embedded in a homogeneous conductive medium. Our analytical contribution deals with prolate spheroids, since the corresponding results for the oblate spheroidal geometry can be readily obtained through a simple transformation. The particular physics concerns a solid impenetrable body under a magnetic dipole excitation, where the scattering boundary value problem is attacked via rigorous low-frequency expansions in terms of integral powers (ik ) to n, n ≥ 0 , k being the complex wavenumber of the exterior medium, for the incident, scattered and total electric and magnetic fields. Our goal is to obtain the most important terms of the low-frequency expansions of the electromagnetic fields, that is the static(for n=0)and the dynamic (n =1, 2, 3) terms. In particular, for n = 1 there are no incident fields, while for n = 0 the Rayleigh electromagnetic term is easily obtained. Emphasis is on the calculation of the next two nontrivial terms (at n = 2 and at n = 3 ) of the magnetic and the electric fields. Those are found in closed form from exact solutions of coupled (at n = 2, to the one at n = 0) or uncoupled (at n = 3) Laplace equations and given in compact fashion, as infinite series expansions for n = 0, 2 or finite forms for n = 3.

  • 1:  Division of Applied Mathematics and Mechanics - Department of Engineering Sciences, School of Engineering
  • University of Patras
  • 2:  Laboratoire des signaux et systèmes (L2S)
  • UMR8506 CNRS – SUPELEC – Université Paris XI - Paris Sud
  • Domain : Engineering Sciences/Electromagnetism
    Mathematics/Mathematical Physics
  • Keywords : low-frequency scattering – perfectly conducting spheroidal bodies – impenetrable solid obstacles – magnetic dipoles
  • Comment : ISBN: 978-981-281-484-5 ISBN: 978-981-281-485-2 (ebook)
 
  • hal-00637749, version 1
  • oai:hal.archives-ouvertes.fr:hal-00637749
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  • Submitted on: Wednesday, 2 November 2011 18:11:46
  • Updated on: Thursday, 18 October 2012 16:15:23