Thèse soutenue

Etude d'antennes planaires à motifs périodiques par la théorie des matériaux à BIE
FR  |  
EN
Accès à la thèse
Auteur / Autrice : Sébastien Pioch
Direction : Jean-Marc Laheurte
Type : Thèse de doctorat
Discipline(s) : Électronique
Date : Soutenance en 2004
Etablissement(s) : Nice

Mots clés

FR

Résumé

FR  |  
EN

The works presented in this thesis concern the study of periodic planar antennas by the theory of EBG materials. We first propose a means to reduce the size of printed antenna based on periodic structure (UC-PBG type). For this purpose, we modify the dimensions of the unit cell in order to slow down the phase velocity in the pattern. The various structures are analyzed with the dispersion diagrams. As the material is used as a radiating element, it is not used in its first bandgap. Then, we propose a new type of dual-band antenna based on a stacked patch antenna and a EBG antenna. In the second part, we also try to obtain a reduction effect with metamaterials based on coplanar waveguide periodically loaded with reactive elements. Equivalents models are introduced to determine the dispersion equation and to locate the frequency bandgap. A parametric study on the period of the structure shows frequencies inside and outside the light cone. For this type of structure, reduction of the length resonant is not realized because the antennas present important values of attenuation. In the last part, we are interested in the insertion of RF MEMS in a cavity-backed slot antenna. The simulated results show the possibility to have a reconfigurable antenna on one octave by changing the capacitive ratio of this microswitches.