Comptes Rendus
Inverse characterization of antennas by equivalent sources using spherical harmonics
Comptes Rendus. Physique, Volume 6 (2005) no. 6, pp. 640-646.

The present paper deals with the analysis of electromagnetic radiations and the interaction of radiated waves with the environment. The characterization by simulation of the phenomena resulting from the interaction of the fields with the surrounding objects requires as a preliminary the synthesis of robust and simple equivalent source models to be integrated in propagation schemes. Methods such as ray-tracing or launched rays coupled with reliable mathematical models such as the Uniform technique of Diffraction UTD then allow a good analysis of the phenomena. The proposed technique is based on the decomposition of a source, of arbitrary geometry and whose dimensions do not allow direct use of the asymptotic methods in its vicinity, into smaller equivalent sources which make possible to calculate the field radiated close to the transmitter. The equivalent elementary sources are represented by their spherical modes. The choice of the number of sources and the number of modes allows us to develop effective models and to account for the objects close to the antennas.

Ce travail s'inscrit dans la démarche de l'analyse des émissions électromagnétiques (EM) et de l'interaction de ces champs avec l'environnement. La caractérisation par la simulation des phénomènes résultant de l'interaction des champs avec les objets environnants nécessite au préalable la synthèse de modèles de sources équivalentes robustes et simples d'utilisation dans des modèles de propagation. Des méthodes telles que le tracé ou le lancé de rayons couplées avec des modèles mathématiques fiables tel que la technique uniforme de diffraction (UTD) permettent alors une bonne analyse des phénomènes. La technique proposée est basée sur la décomposition d'une source, de géométrie quelconque et dont les dimensions ne permettent pas l'utilisation triviale des méthodes asymptotiques en zone proche, en sources équivalentes plus petites qui, elles, permettent de calculer le champ rayonné très près de l'émetteur. Les sources élémentaires équivalentes sont représentées par leurs modes sphériques. Le choix du nombre de sources et du nombre de modes permet l'élaboration de modèles efficaces et la prise en compte des objets proches des antennes.

Published online:
DOI: 10.1016/j.crhy.2005.06.006
Keywords: Equivalent sources, Spherical modes, Ray-tracing, Inverse problem
Mot clés : Sources équivalentes, Modes sphériques, Tracé de rayon, Problème inverse

Azeddine Gati 1; Yacine Adane 1; Man-Faï Wong 1; Joe Wiart 1; Victor Fouad-Hanna 2

1 France Télécom R&D, 92794 Issy Moulineaux, France
2 Laboratoire instruments et systèmes, université Pierre et Marie Curie, 75252 Paris cedex 05, France
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Azeddine Gati; Yacine Adane; Man-Faï Wong; Joe Wiart; Victor Fouad-Hanna. Inverse characterization of antennas by equivalent sources using spherical harmonics. Comptes Rendus. Physique, Volume 6 (2005) no. 6, pp. 640-646. doi : 10.1016/j.crhy.2005.06.006. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2005.06.006/

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