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Open AccessArticle

Passive UHF RFID Tag for Multispectral Assessment

1
ECsens, CITIC-UGR, Department of Electronic and Computer Technology, ETSIIT University of Granada, Granada E-18071, Spain
2
ECsens, Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Granada E-18071, Spain
3
Institute for Nanoelectronics, Technical University of Munich, Munich DE-80333, Germany
*
Author to whom correspondence should be addressed.
Academic Editors: Changzhi Li, Roberto Gómez-García and José-María Muñoz-Ferreras
Sensors 2016, 16(7), 1085; https://doi.org/10.3390/s16071085
Received: 18 May 2016 / Revised: 7 July 2016 / Accepted: 11 July 2016 / Published: 14 July 2016
(This article belongs to the Special Issue Non-Contact Sensing)
This work presents the design, fabrication, and characterization of a passive printed radiofrequency identification tag in the ultra-high-frequency band with multiple optical sensing capabilities. This tag includes five photodiodes to cover a wide spectral range from near-infrared to visible and ultraviolet spectral regions. The tag antenna and circuit connections have been screen-printed on a flexible polymeric substrate. An ultra-low-power microcontroller-based switch has been included to measure the five magnitudes issuing from the optical sensors, providing a spectral fingerprint of the incident electromagnetic radiation from ultraviolet to infrared, without requiring energy from a battery. The normalization procedure has been designed applying illuminants, and the entire system was tested by measuring cards from a colour chart and sensing fruit ripening. View Full-Text
Keywords: screen printing; printed electronics; passive RFID tag; optical sensor; microcontroller; spectral fingerprint screen printing; printed electronics; passive RFID tag; optical sensor; microcontroller; spectral fingerprint
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Escobedo, P.; Carvajal, M.A.; Capitán-Vallvey, L.F.; Fernández-Salmerón, J.; Martínez-Olmos, A.; Palma, A.J. Passive UHF RFID Tag for Multispectral Assessment. Sensors 2016, 16, 1085.

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