An Experimentally Validated Smart Card UHF Tag Antenna ForFree Space and Near Body Scenarios

Journal article

Riaz, M., Ghavami, M. and Dudley-McEvoy, S. (2020). An Experimentally Validated Smart Card UHF Tag Antenna ForFree Space and Near Body Scenarios. IET Microwaves, Antennas and Propagation.
AuthorsRiaz, M., Ghavami, M. and Dudley-McEvoy, S.
Abstract

This investigation primarily promotes a UHF RFID tag antenna for complex environment applications of smart card in free space and near body scenarios. It also considers other high dielectric materials such as water and metallic objects. A dual dipole antenna with T-match structure is chosen due to the advantage of providing high resilience towards change in impedance of high dielectrics, and to ensure the reception of maximum signals at the blind spots of the antenna. The proposed geometry facilitates placement of other off-the-shelf high and low frequency antennas on the card, enabling more features, higher performance, and minimum field interaction between different frequencies. A presented RLC equivalent circuit model estimates the impact of body layers on antenna impedance. A high read range of 7.7 meters in free space, 5.2 meters near body and 2.8 meters at the blind
spots is obtained. The novelty is shown by testing the antenna near metals and water, achieving high read range without any design modifications. The proposed tag aims to provide new RFID applications that demand small size, less volume, low cost and multifunctionality over various constraints, while showing good agreement with sensitivity, impedance matching and the read range.

KeywordsUHF Tag; Near Body Scenario; Antenna
Year2020
JournalIET Microwaves, Antennas and Propagation
PublisherInstitution of Engineering and Technology
ISSN1350-2417
Publication process dates
Accepted23 Jul 2020
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