A Printed LC Resonator-Based Flexible RFID for Remote Potassium Ion Detection


This article presents a flexible printed radio-frequency identification (RFID) sensor based on a printed inductive–capacitive (LC) resonator circuit and a potassium ion-selective electrode (ISE) for remote potassium ion sensing. The potassium ion concentration of the contact solution can be monitored by measuring the change of the resonant frequency of the RFID sensor. The resonant frequency of the sensor can be directly detected by measuring the induced change in the reflection coefficient ( S11 ) of an external interrogator coil that is inductively coupled to the RFID sensor. Results obtained for the RFID sensor exhibited a second-order exponential relationship between the resonant frequency of the sensor and the K + concentration of the solution over 0.001–2 mol/L dynamic range values. Effects of varying separation distance between the sensor and the interrogator coil and the effect of temperature variations on sensor’s measurement are shown. With less than 2-s response time and the long-term stability, the wireless passive printed sensor has potential for low-cost K + monitoring applications such as K + monitoring in food packages.
Date of Publication: December 17, 2021
Electronic ISSN: 2768-167X
Publisher: IEEE
McGill University, Montreal, Canada
Tianhang Wu received the B.Eng. degree in electrical engineering from McGill University, Montreal, QC, Canada, in 2019, where he is currently pursuing the M.Sc. degree in electrical engineering.
His research focuses on flexible radio frequency identification (RFID) sensors.
Mr. Wu was a recipient of the 2019 McGill Graduate Excellence Fellowship.
McGill University, Montreal, Canada
Sharmistha Bhadra (Member, IEEE) received the B.Sc. degree in computer engineering from the University of New Brunswick, Fredericton, NB, Canada, in 2008, and the M.Sc. and Ph.D. degrees in electrical engineering from the University of Manitoba, Winnipeg, MB, Canada, in 2010 and 2015, respectively.
From 2015 to 2016, she was a Natural Sciences and Engineering Research Council (NSERC) Post-Doctoral Fellow with The University of British Columbia, Vancouver, BC, Canada. She joined McGill University, Montreal, QC, Canada, in 2016. She is currently an Assistant Professor with McGill University. She has published numerous articles and holds two patents in sensor area. Her research interests are in the area of printed and flexible hybrid electronics, microelectromechanical systems, and sensors and actuators.

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