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Caractérisation et Conception d'Antennes Isotropes Miniatures pour Objets Communicants

Abstract : Advances made in the fields of wireless sensor networks, radio frequency identification or millimeter-length communications predict the appearance of small, smart and autonomous objects communicating by means of radio frequency transmissions. In this context, the random and variable orientations of the devices with respect to each others cause strong variations of the budget link because of the radiation anisotropy and the polarization mismatches between antennas. Thus, there is a need for low cost small antennas having radiation characteristics optimized for an independent transmission with respect to their relative orientations. The _rst part of this work consists in proposing a new criterion, called isotropic coverage function, allowing to rigorously characterizing antennas performances in such a context. This method makes it possible to compare various antennas of the literature and to study the effects of their radiation properties. The influence of the propagation environment is also studied. The second part consists in developing two new antennas in response to this issue while taking into account the strong constraints of integration and miniaturization. A prototype is realized and validates the design approach. Finally, a last development considers the case of multi antennas. An extension of the characterization method is proposed. One of the previous structures is enhanced in two versions with two ports and illustrates the principle of a dual polarized isotropic antenna presenting optimized performances.
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https://tel.archives-ouvertes.fr/tel-00389796
Contributor : Laurent Guilloton <>
Submitted on : Friday, May 29, 2009 - 4:07:36 PM
Last modification on : Thursday, June 11, 2020 - 5:04:05 PM
Long-term archiving on: : Thursday, June 10, 2010 - 9:03:20 PM

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  • HAL Id : tel-00389796, version 1

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Mathieu Huchard. Caractérisation et Conception d'Antennes Isotropes Miniatures pour Objets Communicants. Autre. Institut National Polytechnique de Grenoble - INPG, 2007. Français. ⟨tel-00389796⟩

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