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Sensors 2016, 16(7), 1085;

Passive UHF RFID Tag for Multispectral Assessment

ECsens, CITIC-UGR, Department of Electronic and Computer Technology, ETSIIT University of Granada, Granada E-18071, Spain
ECsens, Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Granada E-18071, Spain
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
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)
Full-Text   |   PDF [3436 KB, uploaded 14 July 2016]   |  


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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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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