A Reconfigurable Passive UHF Reader Loop Antenna for Near-Field and Far-Field RFID Applications
A Reconfigurable Passive UHF Reader Loop Antenna for Near-Field and Far-Field RFID Applications
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DOI：
10.1109/lawp.2012.2200870
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发表时间：
2012-05
影响因子：
4.2
通讯作者：
A. Borja;Á. Belenguer;J. Cascón;J. Kelly
中科院分区：
文献类型：
--
作者：
A. Borja;Á. Belenguer;J. Cascón;J. Kelly
本文介绍了一种左手加载的无源超高频印制环天线。RFID读取器天线可以在欧洲UHF(865-868 MHz)频段内的近场和远场工作。采用变容二极管可以改变工作频率和辐射特性。此外，该天线可以工作在询问区域中具有平坦磁场分布的近场区域。与其他无源RFID阅读器常规天线的比较研究表明，左手环路具有更强的近H场和良好的阻抗匹配。文中给出了设计细节、仿真结果和制作的样机。这一概念极大地扩展了RFID天线的设计自由度。
This letter presents a passive UHF printed loop antenna with left-handed loading. The RFID reader antenna can work at near- and far-field operation within the European UHF (865-868 MHz) band. The operation frequency and radiation properties can be modified by employing varactor diodes. Also, the antenna can work in the near-field region having a flat magnetic distribution in the interrogation zone. A comparative study with other passive RFID reader conventional antennas shows that the left-handed loop achieves stronger near H-field with good impedance matching. Design details, simulated results, and a fabricated prototype are presented. The concept significantly extends the design degrees of freedom for RFID antennas.