{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,15]],"date-time":"2026-06-15T03:33:22Z","timestamp":1781494402517,"version":"3.54.1"},"reference-count":22,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2017,7,5]],"date-time":"2017-07-05T00:00:00Z","timestamp":1499212800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A circular polarized patch antenna for UHF RFID tag-based sensor applications is presented, with the circular polarization (CP) generated by a new antenna shape, an asymmetric stars shaped slotted microstrip patch antenna (CP-ASSSMP). Four stars etched on the patch allow the antenna\u2019s size to be reduced by close to 20%. The proposed antenna is matched with two RFID chips via inductive-loop matching. The first chip is connected to a resistive sensor and acts as a sensor node, and the second is used as a reference node. The proposed antenna is used for two targets, serving as both reference and sensor simultaneously, thereby eliminating the need for a second antenna. Its reader can read the RFID chips at any orientation of the tag due to the CP. The measured reading range is about 25 m with mismatch polarization. The operating frequency band is 902\u2013929 MHz for the two ports, which is covered by the US RFID band, and the axial-ratio bandwidth is about 7 MHz. In addition, the reader can also detect temperature, based on the minimum difference in the power required by the reference and sensor.<\/jats:p>","DOI":"10.3390\/s17071576","type":"journal-article","created":{"date-parts":[[2017,7,5]],"date-time":"2017-07-05T11:26:04Z","timestamp":1499253964000},"page":"1576","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Multiport Circular Polarized RFID-Tag Antenna for UHF Sensor Applications"],"prefix":"10.3390","volume":"17","author":[{"given":"Jamal","family":"Zaid","sequence":"first","affiliation":[{"name":"Institut National de la Recherche Scientifique Centre Centre \u00c9nergie Mat\u00e9riaux T\u00e9l\u00e9communications 800, De La Gaucheti\u00e8re Ouest Bureau 6900, Montr\u00e9al, QC H5A 1K6, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abdulhadi","family":"Abdulhadi","sequence":"additional","affiliation":[{"name":"Institut National de la Recherche Scientifique Centre Centre \u00c9nergie Mat\u00e9riaux T\u00e9l\u00e9communications 800, De La Gaucheti\u00e8re Ouest Bureau 6900, Montr\u00e9al, QC H5A 1K6, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arun","family":"Kesavan","sequence":"additional","affiliation":[{"name":"Institut National de la Recherche Scientifique Centre Centre \u00c9nergie Mat\u00e9riaux T\u00e9l\u00e9communications 800, De La Gaucheti\u00e8re Ouest Bureau 6900, Montr\u00e9al, QC H5A 1K6, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yassin","family":"Belaizi","sequence":"additional","affiliation":[{"name":"IES-UMR CNRS 5214 Universit\u00e9 de Montpellier, 34095 Montpellier Cedex 5, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tayeb","family":"Denidni","sequence":"additional","affiliation":[{"name":"Institut National de la Recherche Scientifique Centre Centre \u00c9nergie Mat\u00e9riaux T\u00e9l\u00e9communications 800, De La Gaucheti\u00e8re Ouest Bureau 6900, Montr\u00e9al, QC H5A 1K6, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2017,7,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"3418","DOI":"10.1109\/TAP.2009.2028707","article-title":"Design of a Circularly Polarized Tag Antenna for Increased Reading Range","volume":"57","author":"Cho","year":"2009","journal-title":"IEEE Trans. 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