Th. doct. : Sciences et technologies de l'information et de la communication, Institut Mines-Télécom-Télécom Bretagne-UEB, UMR CNRS 6285 - Télécom Bretagne - Université de Bretagne Occidentale - Université de Bretagne Sud, décembre 2011
This thesis is a contribution to the exploitation of the 60 GHz band (57-64 GHz) for setting up a WPAN network (IEEE. 802.15c) in an aircraft and offering high data rate communications for its passengers. It was prepared as part of a research project supported by the Aeronautics and Space Foundation and developed by two laboratories working together, namely Lab-STICC - Brest and LAAS - Toulouse.These works mainly aim at developing the antenna systems needed to provide communications at 60 GHz covering the space by means of the beamforming technique. In the first step, an analysis 'system' based on scenarios of utilisation helped us to define the technical specifications of the antenna system. In the second step, antennas having a bandwidth compatible with the standard (802.15c IEEE.) were developed at 60 GHz. These are planar antennas located on silicon membrane to improve their efficiency. The solutions chosen are either patch antennas equipped with parasitic radiating elements or patch fed by either T or U-shape microstrip lines. Such antennas are designed so that their constitutive elements are printed on a single dielectric layer. Their main advantage is the improvements obtained for their bandwidth since the latter is respectively two and three times greater than that of a single patch. The simulation and measurements results have shown that the best configuration is that of patch fed by a U-shape microstrip via a dielectric gap. This antenna covers easily the band running from 55 GHz to 65 GHz, with antenna efficiency 90%. It is as compact as a single patch, therefore making its integration easier in a planar antenna array. Since it is implanted on silicon membrane, its integration on the same substrate is then facilitated with the needed active elements of the network control. Associated with MEMS phase shifters on the same silicon layer, the U-shape antennas have finally been used to design a 2x1 phased antenna array which yields different RF beamforming positions. The array gain is then found to vary 4.3 dBi and 7.8 dBi for an angular range of ± 45 °.
1 : Lab-STICC - Laboratoire en sciences et technologies de l'information, de la communication et de la connaissance (UMR CNRS 6285 - Télécom Bretagne - Université de Bretagne Occidentale - Université de Bretagne Sud)
2 : MO - Dépt. Micro-Ondes (Institut Mines-Télécom-Télécom Bretagne-UEB)
Internet dans les avions, WPAN, Formation de faisceau, Réseau d'antennes déphasées, Antenne patch large bande, Membrane, Déphaseur MEMS-RF