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Volume 21
Issue 14
10.3390/s21144862
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Article

Chipless RFID Label with Identification and Touch-Sensing Capabilities

by
Rahul Unnikrishnan
1,
Olivier Rance
1,
Nicolas Barbot
1 and
Etienne Perret
1,2,*
1
LCIS Laboratory, Grenoble INP, Université Grenoble Alpes, Grenoble INP, LCIS, F-26000 Valence, France
2
Institut Universitaire de France, 75005 Paris, France
*
Author to whom correspondence should be addressed.
Sensors 2021, 21(14), 4862; https://doi.org/10.3390/s21144862
Submission received: 18 May 2021 / Revised: 14 June 2021 / Accepted: 13 July 2021 / Published: 16 July 2021
(This article belongs to the Special Issue RFID and Zero-Power Backscatter Sensors)
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Abstract

This article presents a 14-bit chipless RFID label which, in addition to classical identification feature, can be used as decimal numeric keypad, allowing the deployment of secure access control applications. A low-cost single layer label comprising 10 RF loop scatterers is used to code information in the frequency domain. In addition, each resonator is associated to a digit in the decimal number system, and the difference in the spectrum caused by the touch event is exploited for the detection of each key pressing. The shape of the resonators has been carefully selected to be both highly resonant and to show high sensitivity to the presence or absence of the human finger. The concept is validated by measurements in an office environment using an FCC compliant low-cost chipless reader and microstrip vivaldi antennas. Simple detection algorithms are proposed for both identification and touch sensing in real environment.
Keywords: chipless RFID; back scattering; gesture recognition chipless RFID; back scattering; gesture recognition

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MDPI and ACS Style

Unnikrishnan, R.; Rance, O.; Barbot, N.; Perret, E. Chipless RFID Label with Identification and Touch-Sensing Capabilities. Sensors 2021, 21, 4862. https://doi.org/10.3390/s21144862

AMA Style

Unnikrishnan R, Rance O, Barbot N, Perret E. Chipless RFID Label with Identification and Touch-Sensing Capabilities. Sensors. 2021; 21(14):4862. https://doi.org/10.3390/s21144862

Chicago/Turabian Style

Unnikrishnan, Rahul, Olivier Rance, Nicolas Barbot, and Etienne Perret. 2021. "Chipless RFID Label with Identification and Touch-Sensing Capabilities" Sensors 21, no. 14: 4862. https://doi.org/10.3390/s21144862

APA Style

Unnikrishnan, R., Rance, O., Barbot, N., & Perret, E. (2021). Chipless RFID Label with Identification and Touch-Sensing Capabilities. Sensors, 21(14), 4862. https://doi.org/10.3390/s21144862

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