一款圆极化RFID天线的设计

Design of a Circularly Polarized RFID Antenna

射频识别(RFID)技术是信息科技领域最重要的技术之一,已应用于医疗、物流、航空、自动识别等各个领域。但是,目前很多天线一般只能接收水平方向或垂直方向的辐射波,不能适应各种不同的环境。因此,本文设计了一款中心频率工作于2.45GHz的左旋圆极化RFID读写天线。该天线是在矩形贴片天线的基础上进行改进,切掉矩形贴片的四个边角。仿真结果显示,其具有较好的圆极化特性。

Radio frequency identification(RFID) technology is one of the most important technologies in the field of information technology, which has been applied in medical, logistics, aviation, automatic identification and other fields. However, at present, many antennas can only receive horizontal or vertical radiation waves, which can’t adapt to different environments. Therefore, a left-handed circularly polarized RFID read-write antenna with center frequency was designed in this paper. The antenna was improved on the basis of the rectangular patch antenna, and the four corners of the rectangular patch were cut off. The simulation results show that the antenna has better circularly polarized characteristics.