A canonical UTD solution for electromagnetic scattering by an electrically large impedance circular cylinder illuminated by an obliquely incident plane wave

García Aguilar, Andrés; Pathak, Prabhakar H. y Sierra Pérez, Manuel (2013). A canonical UTD solution for electromagnetic scattering by an electrically large impedance circular cylinder illuminated by an obliquely incident plane wave. "IEEE Transactions on Antennas and Propagation" (n. 99); pp. 1-11. ISSN 0018-926X. https://doi.org/10.1109/TAP.2013.2274691.

Descripción

Título: A canonical UTD solution for electromagnetic scattering by an electrically large impedance circular cylinder illuminated by an obliquely incident plane wave
Autor/es:
  • García Aguilar, Andrés
  • Pathak, Prabhakar H.
  • Sierra Pérez, Manuel
Tipo de Documento: Artículo
Título de Revista/Publicación: IEEE Transactions on Antennas and Propagation
Fecha: Julio 2013
Materias:
Escuela: E.T.S.I. Telecomunicación (UPM)
Departamento: Señales, Sistemas y Radiocomunicaciones
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

A uniform geometrical theory of diffraction (UTD) solution is developed for the canonical problem of the electromagnetic (EM) scattering by an electrically large circular cylinder with a uniform impedance boundary condition (IBC), when it is illuminated by an obliquely incident high frequency plane wave. A solution to this canonical problem is first constructed in terms of an exact formulation involving a radially propagating eigenfunction expansion. The latter is converted into a circumferentially propagating eigenfunction expansion suited for large cylinders, via the Watson transform, which is expressed as an integral that is subsequently evaluated asymptotically, for high frequencies, in a uniform manner. The resulting solution is then expressed in the desired UTD ray form. This solution is uniform in the sense that it has the important property that it remains continuous across the transition region on either side of the surface shadow boundary. Outside the shadow boundary transition region it recovers the purely ray optical incident and reflected ray fields on the deep lit side of the shadow boundary and to the modal surface diffracted ray fields on the deep shadow side. The scattered field is seen to have a cross-polarized component due to the coupling between the TEz and TMz waves (where z is the cylinder axis) resulting from the IBC. Such cross-polarization vanishes for normal incidence on the cylinder, and also in the deep lit region for oblique incidence where it properly reduces to the geometrical optics (GO) or ray optical solution. This UTD solution is shown to be very accurate by a numerical comparison with an exact reference solution.

Más información

ID de Registro: 19108
Identificador DC: http://oa.upm.es/19108/
Identificador OAI: oai:oa.upm.es:19108
Identificador DOI: 10.1109/TAP.2013.2274691
URL Oficial: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6567919
Depositado por: Memoria Investigacion
Depositado el: 09 Sep 2013 18:04
Ultima Modificación: 21 Abr 2016 17:21
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