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Conception et validation de déphaseurs large bande intégrant des MEMS-RF dans un environnement hostile

Abstract : These research works is within the context of an improved link budget telemetry data on space launchers. For this device, an electronically steerable antenna was chosen. It uses an array of four patch antennas supplied by a prototype composed of a power splitter 1 to 4 and four phase shifters. For each selected phase shifters, the phase states are 0 °, 90 ° and 180 °.After a bibliographical study, the best phase shifters that can perform this function are the shifters based on hybrid coupler. Thanks to the use of RF-MEMS in these circuits, it is not necessary to add power amplifiers because these components are linear and present low RF losses. Several topologies of phase shifters based on hybrid coupler using RF-MEMS were studied. According to this study, it was possible to reduce the size of circuits without damaging the RF performance, which allowed us to choose two of them. A remote control is needed for these devices to relay box then was chosen for this role. The first prototype consists of a power divider which was commissioned and produced phase shifters. The second prototype is fully integrated on-chip, which has reduced the device surface and improves the RF losses.These studies were able to demonstrate the feasibility to produce a simple linear prototype with low RF losses.
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Alexandre Harck. Conception et validation de déphaseurs large bande intégrant des MEMS-RF dans un environnement hostile. Micro et nanotechnologies/Microélectronique. Université de Limoges, 2014. Français. ⟨NNT : 2014LIMO0044⟩. ⟨tel-01135972⟩

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