可贴敷于人体的RFID标签天线设计

Design of a RFID Tag Antenna for Human Body

设计了一款可贴敷于人体的超高频(UHF)射频识别(RFID)标签天线,该天线由矩形辐射单元、环形馈电和匹配网络组成,其总体尺寸为54.3 mm×40 mm×0.8 mm。分析了人体不同部位、天线与人体间距以及天线自身结构变化对天线辐射性能的影响。通过调节环形馈电和匹配网络尺寸可以实现天线与芯片之间的阻抗共轭匹配。样品测试结果与仿真结果比较吻合,当标签天线贴敷在人体背部时,实际测量的最大读取距离可达4.9 m。

A tag antenna which can be mounted on human body is designed in ultra high frequency （UHF） radio fre- quency identification （RFID） band. The proposed tag antenna consists of rectangular radiation unit, annular feeding and matching network. Its size is 54.3 min×40 min×0.8 ram. The influences of different parts of the human body and the dis- tance between the antenna and the human body as well as the structure of the antenna on the radiation performance of the an- tenna are analyzed. The conjugate matching of impedance between the antenna and the chip can be realized by adjusting the size of annular feeding and matching network. The measurement results of the manufactured prototype are in agreement with the simulation results. When the tag antenna is mounted on the back of the human body, the maximum reading distance could be 4.9 In.