title: A High-Gain Passive UHF-RFID Tag with Increased Read Range.
abstract: In this work, a passive ultra-high frequency radio-frequency identification UHF-RFID tag based on a 1.25 wavelengths thin dipole antenna is presented for the first time. The length of the antenna is properly chosen in order to maximize the tag read range, while maintaining a reasonable tag size and radiation pattern. The antenna is matched to the RFID chip by means of a very simple matching network based on a shunt inductance. A tag prototype, based on the Alien Higgs-3 chip, is designed and fabricated. The overall dimensions are 400 mm × 14.6 mm, but the tag width for most of its length is delimited by the wire diameter (0.8 mm). The measured read range exhibits a maximum value of 17.5 m at the 902-928 MHz frequency band. This represents an important improvement over state-of-the-art passive UHF-RFID tags.
authors.affiliation: Departament d'Enginyeria Electr&#242;nica, Universitat Aut&#242;noma de Barcelona (UAB), Campus UAB, Bellaterra, Barcelona 08193, Spain. simone.zuffanelli@uab.cat.
authors.forename: Simone
authors.initials: S
authors.lastname: Zuffanelli
authors.affiliation: Departament d'Enginyeria Electr&#242;nica, Universitat Aut&#242;noma de Barcelona (UAB), Campus UAB, Bellaterra, Barcelona 08193, Spain. pau.aguila@uab.cat.
authors.forename: Pau
authors.initials: P
authors.lastname: Aguila
authors.affiliation: Departament d'Enginyeria Electr&#242;nica, Universitat Aut&#242;noma de Barcelona (UAB), Campus UAB, Bellaterra, Barcelona 08193, Spain. gerard.zamora@uab.cat.
authors.forename: Gerard
authors.initials: G
authors.lastname: Zamora
authors.affiliation: Departament d'Enginyeria Electr&#242;nica, Universitat Aut&#242;noma de Barcelona (UAB), Campus UAB, Bellaterra, Barcelona 08193, Spain. ferran.paredes@uab.cat.
authors.forename: Ferran
authors.initials: F
authors.lastname: Paredes
authors.affiliation: Departament d'Enginyeria Electr&#242;nica, Universitat Aut&#242;noma de Barcelona (UAB), Campus UAB, Bellaterra, Barcelona 08193, Spain. ferran.martin@uab.cat.
authors.forename: Ferran
authors.initials: F
authors.lastname: Martin
authors.affiliation: Departament d'Enginyeria Electr&#242;nica, Universitat Aut&#242;noma de Barcelona (UAB), Campus UAB, Bellaterra, Barcelona 08193, Spain. jordi.bonache@uab.cat.
authors.forename: Jordi
authors.initials: J
authors.lastname: Bonache
keywords: dipole antennas; impedance matching; radio-frequency identification (RFID)