{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,29]],"date-time":"2026-05-29T14:13:42Z","timestamp":1780064022479,"version":"3.54.0"},"reference-count":54,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2016,7,14]],"date-time":"2016-07-14T00:00:00Z","timestamp":1468454400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Government of Spain - Ministry of Education, Culture and Sports","award":["FPU13\/05032"],"award-info":[{"award-number":["FPU13\/05032"]}]},{"name":"Government of Spain - Ministry of Economy and Competitiveness (MINECO)","award":["CTQ2013-44545-R"],"award-info":[{"award-number":["CTQ2013-44545-R"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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.<\/jats:p>","DOI":"10.3390\/s16071085","type":"journal-article","created":{"date-parts":[[2016,7,14]],"date-time":"2016-07-14T10:25:08Z","timestamp":1468491908000},"page":"1085","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Passive UHF RFID Tag for Multispectral Assessment"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1701-8878","authenticated-orcid":false,"given":"Pablo","family":"Escobedo","sequence":"first","affiliation":[{"name":"ECsens, CITIC-UGR, Department of Electronic and Computer Technology, ETSIIT University of Granada, Granada E-18071, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0234-4758","authenticated-orcid":false,"given":"Miguel","family":"Carvajal","sequence":"additional","affiliation":[{"name":"ECsens, CITIC-UGR, Department of Electronic and Computer Technology, ETSIIT University of Granada, Granada E-18071, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7112-3601","authenticated-orcid":false,"given":"Luis","family":"Capit\u00e1n-Vallvey","sequence":"additional","affiliation":[{"name":"ECsens, Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Granada E-18071, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9","family":"Fern\u00e1ndez-Salmer\u00f3n","sequence":"additional","affiliation":[{"name":"Institute for Nanoelectronics, Technical University of Munich, Munich DE-80333, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonio","family":"Mart\u00ednez-Olmos","sequence":"additional","affiliation":[{"name":"ECsens, CITIC-UGR, Department of Electronic and Computer Technology, ETSIIT University of Granada, Granada E-18071, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9050-5413","authenticated-orcid":false,"given":"Alberto","family":"Palma","sequence":"additional","affiliation":[{"name":"ECsens, CITIC-UGR, Department of Electronic and Computer Technology, ETSIIT University of Granada, Granada E-18071, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2016,7,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Finkenzeller, K. 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