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Proceedings 2017, 1(4), 367; doi:10.3390/proceedings1040367

Multiresonator-Based Printable Chipless RFID for Relative Humidity Sensing

McGill University, Montréal, QC, Canada
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
Author to whom correspondence should be addressed.
Published: 7 August 2017
(This article belongs to the Proceedings of Eurosensors 2017)
Download PDF [368 KB, uploaded 13 October 2017]


We present a chipless RFID for relative humidity sensing. It consists of three spiral resonators coupled to a 50 Ω microstrip line. One resonator is used for humidity sensing, and the other two are used for encoding ID. The sensing resonator is coated with a humidity sensitive polymer film. As the relative humidity changes the permittivity of the polymer film varies changing the resonant frequency of the sensing resonator. Results show that a dedicated resonator can sense relative humidity over 21–53% range with 2.5 MHz/%RH sensitivity whereas the other two resonators can represent the ID. The sensor does not require any IC and is amenable to low-cost production using printed electronic technology.
Keywords: antenna; chipless RF identification (RFID); multiresonator; polyvinyl alcohol; relative humidity antenna; chipless RF identification (RFID); multiresonator; polyvinyl alcohol; relative humidity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Dominic, D.; Krafft, S.; Safdari, N.; Bhadra, S. Multiresonator-Based Printable Chipless RFID for Relative Humidity Sensing. Proceedings 2017, 1, 367.

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