Novel Concentric Hexagonal-Shaped RFID Tag Antenna with T-Shaped Stub Matching

Alibakhshikenari, Mohammad; Virdee, Bal S.; Althuwayb, A. A.; Xu, Kai-Da; See, Chan Hwang; Khan, Salahuddin; Park, Ikmo; Falcone, Francisco; Limiti, Ernesto

Abstract

This paper presents a unique concentric hexagonal-shaped ring antenna for radio frequency identification (RFID) tags. The rings are excited with a common microstrip feedline. The radiation characteristics of the antenna is improved by locating a horizontal a parasitic element in the vicinity of the hexagonal-shaped rings. The proposed antenna was used in the implementation of a 3×1 antenna array. The impedance match of the 3×1 RFID tag was enhanced by incorporating a T-shaped stub. The antenna is designed to operate at the UHF band from 800 MHz to 960 MHz. It was implemented on FR-4 substrate with dielectric constant and thickness of 4.3 and 1.6 mm, respectively. The size of the RFID tag antenna is 36×10 mm 2. Its impedance was matched to Alien Higgs RFIC chip of impedance 10-j 82.5 Ω at 895 MHz. Measured results show the proposed RFID tag antenna provides an impedance bandwidth, maximum gain and radiation efficiency of 160 MHz, 2 dBi, and 66.5%, respectively. With effective isotropic radiated power (EIRP) limited to 36 dBm to comply with FCC regulations for UHF band RFIDs it radiates in the broadside direction over a range of 9 m making it desirable for

• Journal Article Type: Article
• Acceptance Date: Oct 28, 2021
• Online Publication Date: Nov 13, 2021
• Publication Date: 2022
• Deposit Date: Oct 28, 2021
• Publicly Available Date: Nov 13, 2021
• Journal: IEEE Journal of Radio Frequency Identification
• Electronic ISSN: 2469-7281
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 6
• Pages: 112-120
• DOI: https://doi.org/10.1109/JRFID.2021.3124966
• Keywords: RFID tag , concentric hexagonal-shaped ring antenna, microstrip integrated circuits, UHF band, impedance matching circuit, effective isotropic radiated power (EIRP)
• Public URL: http://researchrepository.napier.ac.uk/Output/2817033