Novel concentric hexagonal-shaped RFID tag antenna with T-shaped stub matching Articles uri icon

authors

  • ALIBAKHSHIKENARI, MOHAMMAD
  • VIRDEE, BAL S.
  • ALTHUWAYB, AYMAN A.
  • XU, KAI-DA
  • SEE, CHAN HWANG
  • KHAN, SALAHUDDIN
  • PARK, IKMO
  • FALCONE, FRANCISCO
  • LIMITI, ERNESTO

publication date

  • November 2021

start page

  • 112

end page

  • 120

volume

  • 6

Electronic International Standard Serial Number (EISSN)

  • 2469-7281

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 mm2. 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 various applications including supply chain management, logistic control, and vehicle identification.

keywords

  • rfid tag; concentric hexagonal-shaped ring antenna; microstrip integrated circuits; uhf band; impedance matching circuit; effective isotropic radiated power (eirp)