Réseaux de SQUIDs à haute température critique pour applications dans le domaine des récepteurs hyperfréquences

Abstract : Superconducting Quantum Interference Filters (SQIF) are Josephson circuits very sensitive to magnetic field. They are made of arrays of SQUIDs (Superconducting QUantum Interference Devices). The latter, when operated alone, doesn’t allows absolute magnetic field measurements and have to be used with a flux locked loop, which limits the frequency band of operation. SQIFs doesn’t have such limitations and they offer the possibility to combine compactness, sensitivity and wide band of frequency at the same time. Because of this, SQIFs are serious concurrents to classical antennas in microwave applications. Experimental measurements made with HTS SQIFs and irradiated Josephson junctions shows that it is possible to detect microwave signals up to 5 GHz in an unshielded environment, and near field configuration. To perform better detection, it is important to match impedance of circuits. In the goal to do this and to improve DC characteristics, different network geometries are studied. At the end this study allows to define which parameters are important in the design of SQIF circuits for microwave detection.
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Eliana Recoba Pawlowski. Réseaux de SQUIDs à haute température critique pour applications dans le domaine des récepteurs hyperfréquences. Science des matériaux [cond-mat.mtrl-sci]. Université Paris-Saclay, 2019. Français. ⟨NNT : 2019SACLS121⟩. ⟨tel-02286225⟩

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