Beam Scanning UHF RFID Reader Antenna with High Gain and Wide Axial Ratio Beamwidth
Beam Scanning UHF RFID Reader Antenna with High Gain and Wide Axial Ratio Beamwidth
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DOI：
10.1109/rfid-ta.2019.8891995
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发表时间：
2019-09
期刊：
影响因子：
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通讯作者：
Rui Chen;Shuai Yang;Ajeck M. Ndifson;I. White;R. Penty;M. Crisp
中科院分区：
文献类型：
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作者：
Rui Chen;Shuai Yang;Ajeck M. Ndifson;I. White;R. Penty;M. Crisp
提出了一种新型的超高频RFID读写器天线，该天线具有二维波束扫描能力和超过136°的3dB宽轴比波束宽度。所提出的天线由三个同心金属环，每个有一个分支线，以刺激圆极化（CP）和一个单独的饲料。该天线能够在0° ~ 360°方位角和-40° ~ 40°天顶角范围内以相对稳定的增益（9-11 dBic）执行二维波束扫描。天线的AR波束宽度的最小值遵循峰值增益方向，对于每个φ切割，等效3 dB AR波束宽度为136°，比当前最先进的技术更宽[1]。此外，所提出的天线阵列呈现了50 Ω $的阻抗，没有阻抗匹配网络，并且仅需要两个移相器来操纵，显著降低了设计复杂性。该天线的10 dB回波损耗带宽为860 MHz至880 MHz，覆盖欧洲电信标准协会（ETSI）地区的较低频段UHF RFID频率。
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 $50 \Omega$ 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.