Propagation électromagnétique en milieu complexe: du champ proche au champ lointain

Abstract : With the expansion of wireless communications the need for electromagnetic (EM) propagation models is increasing. Antenna's environments are more and more complex and require to distinguish the near field zone and the far field zone.

Concerning the far field zone, high frequencies asymptotic methods based on ray tracing are the most widely used. The uniform theory of diffraction (UTD) has been used to develop ICARE-EM, an EM version of an acoustic software developed by CSTB.

Regarding the near field zone, numerical or experimental methods are the most efficient. The method of moment (MoM) has been applied for resolving EM propagation's problem. We have also used near field technics developed by Supélec.

To obtain a tool for global prediction, we introduce an integral formulation for EM field. This formulation enables to combine asymptotic methods and numerical or experimental methods. By using a
specific boundary condition we obtain a compact form. Dyadic Green's function associated with the outside of the coupling surface is computed by ICARE-EM. Primary source and its near environment are
characterized by near field measurements or MoM computation.

This coupling approach has been validated in the canonical case of diffraction by a metallic sphere and in the main case of two metallic plates illuminated by an electric dipole or a base station antenna. Different configurations have been characterized by
measurements in Supélec's anechoïc room.
Document type :
Theses
Physics [physics]. Institut National Polytechnique de Grenoble - INPG, 2005. French


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Submitted on : Monday, March 20, 2006 - 6:58:57 PM
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Emmanuelle Conil. Propagation électromagnétique en milieu complexe: du champ proche au champ lointain. Physics [physics]. Institut National Polytechnique de Grenoble - INPG, 2005. French. <tel-00011992>

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