一种用于智能交通系统标签天线的设计与仿真

Design and simulation for a kind of tag antenna for ITS application

射频识别技术具有体积小、信息容量大、非接触等诸多优点,在智能交通系统中得到了广泛的应用.针对智能交通系统中RFID技术特点,研究介绍了一种符合ISO/IEC 18000-6标准应用的微带折合偶极子天线.通过给出天线的基本结构,用Ansoft公司的高频仿真软件Ensemble 7.1对天线进行研究,得出天线相关尺寸和输入阻抗的关系曲线.结合工程应用,合理选择了天线的最后尺寸,给出天线的谐振频率、方向图、增益及极轴比.结果表明:该天线具有较好的工作性能,满足智能交通系统中微波RFID标签天线的要求.

Radio frequency identification（RFID） technique is widely used in ITS field because it has a lot of good performances such as small size,large memory space and non-contact characteristics.For the RFID technology in ITS,a new kind of microstrip folded dipole antenna based on ISO/IEC1800-6 standard is described.Firstly, the structure of the antenna is designed,and the relationships between antenna input impedance and related dimensions are given and analyzed with the aid of Ensemble7.1 software,which is produced by Ansoft cooperation.Then ,the antenna resonant frequency,radiation pattern,gain and axial ratio are given.The result shows that the antenna can be used as a tag antenna in the ITS application.