Jin Shi, Longlong Lin, X. Qing, Zhi Ning Chen, H. Tang, Li-Heng Zhou, H. Chu
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引用次数: 2
摘要
为了扩大近场超高频(UHF)射频识别(RFID)系统中读写器天线的询问区,提出了一种双环天线。该双环天线由两个分节的共侧天线和一个双面平行馈线网络组成。每个回路本身都有一个均匀的单向电流。通过向两个分段回路提供反向电流,可以在大范围内实现强而均匀的磁场分布。在FR4印刷电路板(PCB)上的原型表明,双环天线在790 ~ 1040 MHz的频率范围内实现了阻抗匹配,在308 mm × 150 mm的探测区内产生了强而均匀的磁场分布。
Electrically large dual-loop antenna for UHF near-field RFID readers
A dual-loop antenna is proposed to enlarge the interrogation zone of reader antennas used in near-field ultra high frequency (UHF) radio frequency identification (RFID) systems. The dual-loop antenna is composed of two segmented loos with one common side and a double-sided parallel-strip line feeding network. Each loop has a uniform and single direction flowing current itself. By providing reverse-direction flowing current to the two segmented loops, the strong and uniform magnetic field distribution over a large interrogation zone can be achieved. The prototype on FR4 printed borad (PCB) exhibits that the dual-loop antenna achieves the impedance matching over the frequency range from 790 to 1040 MHz and produces strong and uniform magnetic field distribution over an interrogation zone of 308 mm × 150 mm.