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Conception et développement de dispositifs hyperfréquences à reconfiguration rapide à partir de matériaux à transition isolant-métal (MIT) : application au dioxyde de vanadium (VO2)

Mohammad-Nikhian Sadiq 1
1 Lab-STICC_UBO_MOM_DIM
IBNM - Institut Brestois du Numérique et des Mathématiques, Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
Abstract : This thesis, conducted at Lab−STICC as part of the ANR MUFRED project, focuses on the study, the design and the development of reconfigurable microwave devices based on vanadium dioxide (a metal-insulator transition material). This multidisciplinary project – from material deposition and study to the design and characterization of RF devices by way of optical control – aims to demonstrate the VO2 performances as a tuning element for fast (about ten nanoseconds) to ultra-fast (about hundred picoseconds) switching. With this aim in mind, this work begins with a characterization of vanadium dioxide as a tuning element before integrating it into reconfigurable RF devices. Thus, the first VO2 based switches, SPST, SP2T and SP4T are designed for control of the metal-insulator transition with an electrical or optical command. These switches are subsequently used in the design of reconfigurable 1-bit (relative phase shift of 0° and − 45°) and 2-bits (relative phase shift of 0°, − 90°, − 180° and − 270°) switched lines True Time Delay phase shifters. Then this study focuses on the proof-of-concept targeted by the MUFRED project, i.e. a reconfigurable phased array antennas based on VO2 switches. The performances of each RF blocks involved in its design are described, presented and analyzed. The first demonstrators carried out make it possible to foresee prospects for improvement in the short and long term.
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Mohammad-Nikhian Sadiq. Conception et développement de dispositifs hyperfréquences à reconfiguration rapide à partir de matériaux à transition isolant-métal (MIT) : application au dioxyde de vanadium (VO2). Electronique. Université de Bretagne Occidentale, 2019. Français. ⟨tel-02613957⟩

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