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

Accepted version
Peer-reviewed

Type

Article

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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 0º to 360º in the azimuth plane, and 0º to 40º 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 136º 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.

Description

Keywords

Antenna measurements, Phased arrays, Gain, Radiofrequency identification, Two dimensional displays, Current distribution, Antenna arrays, phased arrays, radio-frequency identification, UHF antennas, UHF propagation

Journal Title

IEEE Journal of Radio Frequency Identification

Conference Name

Journal ISSN

2469-729X
2469-7281

Volume Title

4

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Rights

All rights reserved
Sponsorship
Engineering and Physical Sciences Research Council (EP/S019405/1)
Engineering and Physical Sciences Research Council (EP/P003990/1)
This work was supported by EPSRC EP /S-19405/1 Channel Optimised Distributed Passive Sensor Networks