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Etude et réalisation d'antennes ultra-compactes à base de métamatériaux: Application à la réalisation d'une antenne GNSS miniature.

Abstract : In this thesis, original solutions are proposed for antennas not sensitive to their environment. These antennas are designed for GNSS applications and more precisely for multi-bands ones. So the solutions are developed keeping in mind the GNSS specifications. Two difierent research axis are discussed. The first one deals with the natural properties of an antenna composed of diferent radiating structures. So an helix structure is associated with a metallic plate. The specifications of this antenna are in line with the ones of commercial antennas. Nevertheless, this antenna is only one band and in linear polarization which is not conform to the GNSS specifications. To satisfy these specifications a second axis is developed. In this second axis an electric antenna is associated with a specific reflector : a High Impendance Surface. Theorically, this surface allows to place the antenna very close and so reduce the thickness of the whole structure without disturbing the radiation of the antenna. Firstly, the High Impendance Surface and more precisely its periodic patterns is studied. Both one band and dual-band pattern are designed. The one band pattern has a good bandwidth (13%) compared to its size (2,5mm). The dual-band pattern designed by pattern enclosing realized the GNSS specifications in simulation. This is followed by measures. The aim of the thesis is to place the antenna above the designed HIS so a lot of antennas are designed to test and tune the surface. Firstly dipoles are used to study the coupling effects and secondly circular polarized antenna are used to reach the GNSS specifications. For both axis, the radiation pattern and the size of the whole system is optimized. So the proposed solutions are the thinest ones. To conclude the caracteristics of the proposed structures are compared to specifications and to existing antennas and futur work is proposed.
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  • HAL Id : tel-01063404, version 1

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Mélusine Pigeon. Etude et réalisation d'antennes ultra-compactes à base de métamatériaux: Application à la réalisation d'une antenne GNSS miniature.. Sciences de l'ingénieur [physics]. Institut National Polytechnique de Toulouse - INPT, 2011. Français. ⟨tel-01063404⟩

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