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Modélisation électromagnétique de cellules actives environnées - Application à l'analyse et la synthèse d'une antenne reflectarray à balayage électronique

Abstract : Reflectarray antenna is a promising solution for space communications and radar applications as it combines attractive features of reflector and array antennas. A reflectarray consists of an array of reflecting cells fed by a horn antenna. Each cell introduces an appropriate phase-shift to the incident wave to steer the main beam in a desired direction. Thanks to the primary feed horn, the complex feed network that characterizes phased array antennas is not required anymore. This thesis focuses on the electromagnetic simulation of reconfigurable reflectarrays (RRA) with electronic beam scanning. The current simulation approaches of RRA ignore or approximate the mutual coupling effects between cells which lead to prediction errors on the radiation pattern. The simulation of RRA generates complex treatments and requires significant computation time and memory resources. The simulation challenge is to reduce the computation time while preserving high accuracy so as to optimize the radiation performances and the design process. In this context, two innovative methods have been proposed: - The first method is dedicated to the thorough analysis of the field radiated by the reflectarray. It combines the 'surrounded-element' approach developed by M.-A. Milon and the compression technique which is generally used for circuit analysis. The extension of the compression technique to compute the field radiated by active cells in their actual environment is the key contribution of the method. - The second method computes the phase responses of an active cell taking into account mutual coupling from the surrounded cells. The responses are used to select the optimal configuration of the states of the cells so as to provide a pencil beam in a specific direction. Different test cases of active arrays with PIN diodes are considered to demonstrate the performance and the applicability of the two methods for solving the electromagnetic problems associated with RRA. The validation procedure has proved that the methods offer an interesting alternative to classical approaches. The methods are applied to an X-band RRA designed by Thales Systèmes Aéroportés and the space agency CNES. This study has shown that the two methods meet the scientific and industrial objectives in terms of prediction accuracy and short computation time.
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Submitted on : Monday, January 28, 2013 - 1:52:10 PM
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  • HAL Id : tel-00781799, version 1

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Clement Yann. Modélisation électromagnétique de cellules actives environnées - Application à l'analyse et la synthèse d'une antenne reflectarray à balayage électronique. Electronique. INSA de Rennes, 2012. Français. ⟨tel-00781799⟩

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