Beam scanning UHF RFID reader antenna with high gain and wide axial ratio beamwidth
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Publication Date
2019-09-01Journal Title
2019 IEEE International Conference on RFID Technology and Applications, RFID-TA 2019
ISBN
9781728105895
Pages
374-379
Type
Conference Object
This Version
AM
Metadata
Show full item recordCitation
Chen, R., Yang, S., Ndifson, A., White, I., Penty, R., & Crisp, M. (2019). Beam scanning UHF RFID reader antenna with high gain and wide axial ratio beamwidth. 2019 IEEE International Conference on RFID Technology and Applications, RFID-TA 2019, 374-379. https://doi.org/10.1109/RFID-TA.2019.8891995
Abstract
A novel ultra-high-frequency (UHF) RFID reader antenna with 2 dimensional (2D) beam-scanning capability and a wide 3 dB axial ratio (AR) beamwidth of over 136 degrees is presented. The proposed antenna consists of three concentric metal rings, each having a branch wire to stimulate circular polarization (CP) and a separate feed. The antenna is able to perform a 2D beam-scan with a relatively stable gain (9-11 dBic) from 0 degree to 360 degree in azimuth, and -40 degree to 40 degree in zenith. The minima of the antenna's AR beamwidth follows the peak gain direction, giving an equivalent 3 dB AR beamwidth of 136 degree for every phi cut, wider than current state-of-the-art. Moreover, the proposed antenna array presents a 50 Ohm impedance with no impedance matching network, and requires only two phase shifters to steer, significantly reducing the design complexity. The antenna's -10 dB return loss bandwidth is from 860 MHz to 880 MHz, covering the lower band UHF RFID frequencies in the European Telecommunications Standards Institute (ETSI) region.
Sponsorship
Technology Strategy Board (113020)
EPSRC (EP/S019405/1)
Identifiers
External DOI: https://doi.org/10.1109/RFID-TA.2019.8891995
This record's URL: https://www.repository.cam.ac.uk/handle/1810/294784
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