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Approche statistique pour la quantification des performances d'antennes fortement couplées : application à la RFID dans le contexte d'une densité élevée de tags

Abstract : This context of this thesis is that of UHF RFID use cases where a large number of RFID tags is concentrated in a limited volume. This context leads to scenarios in which the tag antennas can be strongly coupled electromagnetically. Under the conditions of high coupling and high density of tags, an antenna can be mismatched and its radiation pattern distorted. As a result of the antenna’s loss of performance, a global reduction of the tags reading rate can be observed as well as a drop of the reading distance for some of the tags. In order to tackle this highly random problem flowing from the unknown distribution of tags, the approach developed in this work is to assume that the electromagnetic coupling between antennas can be modeled by analytical formulas of self and mutual impedances valid for straight resonant dipoles. These dipoles can be loaded by complex impedances corresponding to the chip input impedances of real commercial RFID tags. The analytical models are validated by numerical simulations and experimental results. Statistical studies are performed for a large number of dipole distributions in terms of impedance mismatch and embedded gain variations in the direction of the reader. A statistical analysis of simulated commercial tags is also performed showing a good correlation with the dipole statistics. In the future, this work on the “group behavior” of antennas should provide the analysis and synthesis tools required for a robust evaluation of the tag performances in an environment characterized by a high tag density
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Submitted on : Friday, September 11, 2020 - 5:03:17 PM
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Imad Adjali. Approche statistique pour la quantification des performances d'antennes fortement couplées : application à la RFID dans le contexte d'une densité élevée de tags. Electronique. Université Paris-Est, 2020. Français. ⟨NNT : 2020PESC2011⟩. ⟨tel-02936795⟩

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