A Bending Passive RFID Tag as a Sensor for High-Temperature Exposure

Zahangir Khan, Xiaochen Chen, Han He, Adnan Mehmood, Johanna Virkki

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This paper introduces a prototype of a low-energy high-temperature exposure sensor, which is a temperature-sensitive passive UHF RFID tag that bends forward when exposed to warm air. This "Bending Tag"design is based on a simple dipole antenna fabricated from an electro-textile material. The antenna has a 3D-printed substrate, which is constructed from a commercial Thermo Reactive Filament that gets soft when exposed to 50°C for 30 seconds, causing the tag to bend forward and curve. The sensor tag initially has a read range of more than 6 meters throughout the global UHF RFID frequency band. After bending, there is a significant decrease in the read range (to around 2-3 meters), which is caused by the changed backscattered power of the sensor tag. In an office environment, the backscattered power changes from -36 dBm to -43 dBm. The change in a sensor tag-reference tag system as dP% is approximately 70%. Based on these initial results, our bending tag can be further developed to work as a cost-effective low-energy sensor for monitoring high-temperature exposure.

Original languageEnglish
Article number5541197
Number of pages14
JournalInternational Journal of Antennas and Propagation
Publication statusPublished - 2021
Publication typeA1 Journal article-refereed

Publication forum classification

  • Publication forum level 1

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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