A UHF RFID Reader Antenna with Tunable Axial Ratio and Fixed Beamwidth

Chen, Rui; Yang, Shuai; Ndifon, Ajeck M.; White, I.H.; Penty, R.V.; Crisp, Michael

doi:10.23919/eucap48036.2020.9135882

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…In indoor RFID applications, tag antennas are almost always linearly polarised and randomly oriented, whereas reader antennas can be either linearly or circularly polarised (CP). Besides, even for a circularly polarised antenna, its AR can vary significantly when being viewed from different directions as shown in [17], [18]. Thus, for tags placed at different directions with respect to the transmitter, the power losses caused by polarisation mismatch can be significantly different.…”

Section: An Improved 3d Ray-tracing Modelmentioning

confidence: 99%

A 3D Ray-tracing Model for UHF RFID

Chen

Yang

Liu

et al. 2020

2020 IEEE International Conference on RFID (RFID)

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In this work, a 3-dimensional (3D) ray-tracing model is proposed. The model is specifically tailored for RFID applications by taking into account some of its unique characteristics. The proposed model can give accurate power predictions and is suitable for indoor RFID systems operating with low fade margins. The model has been verified by comparison with Method of Moments (MoM) and practical measurements. It is shown to achieve a high accuracy with significantly less computational complexity than MoM. An example application of the model is presented comparing the performance of two antennas with similar beam patterns but different axial ratio. The predicted tag detection rates (63% and 50%) are in good agreement with the experimental data (65% and 55%), showing the accuracy of the model and its improvement over previous models which are not able to handle axial ratio as accurately.

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Section: An Improved 3d Ray-tracing Modelmentioning

confidence: 99%

A 3D Ray-tracing Model for UHF RFID

Chen

Yang

Liu

et al. 2020

2020 IEEE International Conference on RFID (RFID)

Self Cite

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Antennas for Wide Area Distributed RFID Systems

Crisp

Chen

Ndifon

et al. 2020

2020 International Workshop on Antenna Technology (iWAT)

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

Chen

Yang

Ndifon

et al. 2020

IEEE J. Radio Freq. Identif.

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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 • 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 • to 360 • in azimuth, and-40 • to 40 • in zenith. The minima of the antenna's AR beamwidth follows the peak gain direction, giving an equivalent 3 dB AR beamwidth of 136 • for every phi cut, wider than current state-of-the-art [1]. Moreover, the proposed antenna array presents a 50Ω 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 843 MHz to 880 MHz, covering the lower band UHF RFID frequencies in the European Telecommunications Standards Institute (ETSI) region.

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A UHF RFID Reader Antenna with Tunable Axial Ratio and Fixed Beamwidth

Cited by 3 publications

References 5 publications

A 3D Ray-tracing Model for UHF RFID

A 3D Ray-tracing Model for UHF RFID

Antennas for Wide Area Distributed RFID Systems

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

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