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Conception d’une cellule déphaseuse pour réseau réflecteur reconfigurable à deux polarisations circulaires indépendantes

Abstract : This thesis done in partnership with the French Space Agency (CNES) and the French Defense Agency (DGA) is placed in a very active international context on reflectarrays antennas. A reflectarray consists of a primary source located above microstrip elements on a grounded substrate. The microstrip elements are designed to reradiate the incident wave. A reconfiguration of the radiation pattern can be electronically achieved by introducing switches in each element. In this context, for space applications in X-band, the objective of this thesis is to propose a dual-circular polarization (CP) unit-cell able to separate at the same frequency, the two incident circular polarizations. This unit-cell, made of two layers with reconfigurable capabilities, is based on a circular polarization selective surface (CPSS) and on a single polarization cell. After intensive electromagnetic simulations, the unit-cell in dual-circular polarization with reconfigurable capabilities has been experimentally validated using a specific waveguide measurement. In fact, the unitcell reflects independently and simultaneously the two incidents circular polarizations for a phase resolution around 2 bits in LHCP and in RHCP. A feasibility study of the reconfigurable cell was also carried out to identify the most relevant technologies. Then, a reflectarray in X-band has been designed, fabricated and measured. Made up of 97 cells, it has demonstrated the potentialities of the structure for a realistic space application: scan angle up to 26 °, bandwidth of 800MHz in X-band, cross-polarization rejection>20dB and good polarization purity (AR<2dB). This is the first time that a dual circular polarization reflectarray with reconfigurable capabilities has been validated with the unique capability to reflect independently and simultaneously the two incident circular polarization at the same frequency.
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Simon Mener. Conception d’une cellule déphaseuse pour réseau réflecteur reconfigurable à deux polarisations circulaires indépendantes. Autre. INSA de Rennes, 2013. Français. ⟨NNT : 2013ISAR0028⟩. ⟨tel-00957819⟩

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