Beam Scanning UHF RFID Reader Antenna with High Gain and Wide Axial Ratio Beamwidth

Rui Chen, Shuai Yang, Ajeck M. Ndifon, Ian H. White, Richard V. Penty, Michael Crisp

Research output: Contribution to journalArticlepeer-review

Abstract

A novel ultra-high-frequency (UHF) RFID reader antenna is proposed, designed and measured. The proposed antenna is capable of 2-dimensional (2D) beam-scanning from 0° to 360° in the azimuth plane, and 0° to 40° in the zenith plane. The minima of the antenna's axial ratio (AR) follows its gain maxima during beam-scanning, resulting in an equivalent 3 dB AR beamwidth of over 136° for every phi cut. Moreover, the antenna's AR can be easily modified without affecting other parameters. It is shown experimentally that the antenna's 2D beam-scanning ability and the improved AR performance lead to better tag-reading results, improving the percentage of missing tags by up to 21.6% compared to a standard antenna which has a degraded AR and only supports 1D beam-scanning. In addition, the antenna needs no matching network and has a -10 dB return loss bandwidth from 860 MHz to 880 MHz.

Original languageEnglish
Article number9097294
Pages (from-to)468-475
Number of pages8
JournalIEEE Journal of Radio Frequency Identification
Volume4
Issue number4
Early online date20 May 2020
DOIs
Publication statusPublished - 31 Dec 2020

Keywords

  • Antenna arrays
  • phased arrays
  • radio-frequency identification
  • UHF antennas
  • UHF propagation

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Instrumentation

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