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. 2021 Apr 30;21(9):3138. doi: 10.3390/s21093138

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) Equivalent circuit model of an electromagnetic RFID sensor. (b) Possible layout of the sensor. Working principle of frequency domain RFID sensors based on (c) capacitive or (d) resistive transduction mechanisms.

(a) Equivalent circuit model of an electromagnetic RFID sensor. (b) Possible layout of the sensor. Working principle of frequency domain RFID sensors based on (c) capacitive or (d) resistive transduction mechanisms.