Printed chipless antenna as flexible temperature sensor

Bhattacharjee, M. , Nikbakhtnasrabadi, F. and Dahiya, R. (2021) Printed chipless antenna as flexible temperature sensor. IEEE Internet of Things Journal, 8(6), pp. 5101-5110. (doi: 10.1109/JIOT.2021.3051467)

Abstract

The ever-increasing number of devices on wearable and portable systems comes with challenges such as integration complexity, higher power requirements, and less user comfort. In this regard, the development of multifunctional devices could help immensely as they will provide the same functionalities with lesser number of devices. Herein, we present a dual-function flexible loop antenna printed on Polyvinyl Chloride (PVC) substrate. With a PEDOT:PSS section as part of the printed structure, the presented antenna can also serve as a temperature sensor by means of change in resistance. The antenna resonates at 1.2 GHz and 5.8 GHz frequencies. The ohmic resistance of the temperature sensing part decreases by 70% when the temperature increases from 25.C to 90.C. The developed antenna was characterised using VNA in the same temperature range and the S11 magnitude was found to change by 3.5 dB. The induced current was also measured in the GSM frequency range and sensitivity of 1.2%/∘C was observed for the sensing antenna. The flexible antenna was also evaluated in lateral and cross bending conditions and the response was found to be stable for the cross bending. Due to these unique features, the presented antenna sensor could play a vital role in the drive toward ubiquitous sensing through wearables, smart labels, and the internet of things (IoT).

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Nikbakhtnasrabadi, Dr Fatemeh and Bhattacharjee, Mr Mitradip and Dahiya, Professor Ravinder
• Authors: Bhattacharjee, M., Nikbakhtnasrabadi, F., and Dahiya, R.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: IEEE Internet of Things Journal
• Publisher: IEEE
• ISSN: 2327-4662
• ISSN (Online): 2327-4662
• Published Online: 13 January 2021
• Copyright Holders: Copyright © 2021 The Authors
• First Published: First published in IEEE Internet of Things Journal 8(6): 5101-5110
• Publisher Policy: Reproduced under a Creative Commons License

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
301728		Engineering Fellowships for Growth: Printed Tactile SKIN	Ravinder Dahiya	Engineering and Physical Sciences Research Council (EPSRC)	EP/R029644/1	ENG - Electronics & Nanoscale Engineering