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Contribution to over-the-air characterization of UHF RFID tags : application to livestock RFID

  • El Hajj Chehade, Hadi
Publication Date
Dec 01, 2023
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UHF RFID technology enables to retrieve via radio waves data stored on a tag consisting of an antenna and a chip. The transponder, a key element of an RFID system, has been the subject of much research and improvement in recent years. In this context, this thesis contributes to the evaluation of RFID transponder performance in a real environment, through the development of an original characterization method. This experimental approach provides access to the intrinsic parameters of an RFID tag by taking into account the reciprocity of the propagation channel between the forward and the backward link. Using activation profiles as a function of distance and power, this work introduces new tag evaluation and comparison criteria such as the Q factor or the efficiency γ linked to the mean power transmission coefficient τ and the modulation factor M. By exploiting these power profiles, a new graph (√M,τ) or (Q,γ) has been proposed to illustrate tag comparison and define an optimal operating zone for the RFID chip. The UHF RFID characterization tools proposed in this work have been put to effective use in the development of RFID tags for livestock.

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