Développement d'antennes agiles en fréquence intégrant un condensateur ferroélectrique

Abstract : The rapid growth of wireless communication has promoted the increase of the number of standards for wireless applications. This progress requests new manufacturing processes of smart devices that are able to work on several frequency bands. However, the miniaturization of antennas is accompanied by a significant reduction of the bandwidth as well as its radiation efficiency and it becomes dependent on its using context. Tunable devices can be integrated within antennas in order to overcome these main issues. Among the solutions proposed in the literature, thin-film ferroelectric materials are used to realize tunable capacitors. The use of such materials allows the design of a tunable capacitor that can be tuned by an applied electric field. The advances of these ferroelectric thin-film devices were developed in order to meet particular and extreme requirements for today's telecommunication systems (miniaturization, low cost, ease of the manufacture process, integration and good power handling). This thesis is part of ongoing research over frequency reconfigurable antennas which are based on ferroelectric materials. Two main axes were developed during this work: The development and realization of capacitors that incorporate a BST film along with their microwave characterizations within XLIM lab. The second part of our work is dedicated to the realization of the complete tunable antenna.
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Mohamad Rammal. Développement d'antennes agiles en fréquence intégrant un condensateur ferroélectrique. Micro et nanotechnologies/Microélectronique. Université de Limoges, 2017. Français. ⟨NNT : 2017LIMO0094⟩. ⟨tel-01709308⟩

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