Helical antenna for handheld UHF RFID reader
Helical antenna for handheld UHF RFID reader
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DOI：
10.1109/rfid.2010.5467252
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
P. Nikitin;K. Rao
中科院分区：
文献类型：
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作者：
P. Nikitin;K. Rao
本文设计了一种适用于手持式超高频RFID阅读器的紧凑型高增益圆极化天线。天线为轴向螺旋结构，以逆火方式工作，上接地面，下接反射面。所述天线占地面积小（直径85毫米），在以895 MHz为中心的60 MHz频段（约7%带宽）内提供最大线性增益达6 dBil，驻波比≪2，轴向比≪2 dB。天线可以很容易地调谐到覆盖全球UHF RFID频段（860-960 MHz）的任何所需部分。天线是一个有吸引力的解决方案，手持阅读器最大限度地提高标签读取范围，同时提供圆极化。我们还回顾了现有的手持阅读器天线解决方案，并讨论了链路预算和正向和反向链路权衡。
In this paper, we describe a compact high gain circularly polarized antenna for handheld UHF RFID reader. The antenna is an axial mode helix operating in a backfire mode with ground plane on top and reflector on the bottom. The described antenna has small footprint (85 mm in diameter) and delivers maximum linear gain ≫ 6 dBil, standing wave ratio ≪ 2, and axial ratio ≪ 2 dB in 60 MHz band centered around 895 MHz (approximate bandwidth 7%). The antenna can be easily tuned to cover any desired portion of the global UHF RFID band (860–960 MHz). The antenna is an attractive solution for handheld readers to maximize tag read range while providing circular polarization. We also review existing antenna solutions for handheld readers and discuss link budget and forward and reverse link tradeoffs.