Abstract
This paper presents the design of an ultra high-frequency (UHF) radio frequency identification (RFID) sensor tag integrated into a textile yarn and manufactured using the E-Thread® technology. The temperature detection concept is based on the modification of the impedance matching between RFID tag’s antenna and the chip. This modification is created by the change in the resistance of a thermistor integrated within the tag system due to a temperature variation. Moreover, in order to obtain an environment independent detection, a differential approach is proposed that avoids the use of a pre-calibration phase by the use of a reference tag. Experimental characterization demonstrates the RFID sensor’s potential of detecting a temperature variation or a temperature threshold between and 70 °C through the variation of the transmitted differential activation power.
Highlights
Passive radio frequency identification (RFID) is a technology that originally identified objects associated to a device called a ‘tag’ using the backscattering technique
An RFID tag can be simplified as the association between an antenna and an integrated circuit (IC), which processes the signal originating from the reader
There exists another category of RFID tags that do not include an IC and where the signal backscattered to the reader consists on a ‘signature’ defined by the antenna properties such as geometry and materials
Summary
Passive RFID is a technology that originally identified objects associated to a device called a ‘tag’ using the backscattering technique. This technology consists in associating the antenna and the chip by an automatic assembly process in order to obtain a spool of textile thread integrating a series of RFID tags. One of the interests of this technique is to integrate the tag, here a simple wire, directly into the object as soon as it is manufactured In this case, for the user, the intrusion of the tag into the garment is both invisible and without impact on comfort. UHF RFID yarn and transform it into a sensor tag while keeping the passive nature of the tag and respecting the constraints of the manufacturing process based on the E-Thread technology.
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