一种UHF频段RFID近场环形标签天线设计

A Near-Field Loop Tag Antenna Design for UHF RFID System

摘要: 本文设计了一款应用于UHF频段的RFID近场环形标签天线。该天线通过相邻弯折导线间的反向电流削弱环形结构带来的强感抗，有利于实现阻抗匹配和提升带宽；利用向内弯折结构有效的缩减了天线尺寸，可应用于小尺寸物体追踪识别。最终天线印制在FR-4介质板上，尺寸为7.9 × 10.2 × 0.2 mm³，相比同类型天线缩减了42.1%。仿真与测试结果表明天线在近场区域有很好的性能，可应用在UHF RFID系统。

Abstract: A near-field loop tag antenna for UHF RFID system is proposed. By reverse current from bending adjacent wires to weaken the strong inductive from loop antenna, it’s good for impedance matching and bandwidth promoting; the antenna size can be reduced effectively by the inward bent structure, which can be applied to the small size object tracking identification. The antenna is printed onto the FR-4 substrate, with an overall size of 7.9 × 10.2 × 0.2 mm³, compared to the same type, size of the antenna is reduced to 42.1%. The simulation and test results show that the antenna has a good performance in the near-field region, which can be used in UHF RFID systems.