应用于物流仓储的偶极子反向电流对天线的研究

Research on Dipole Reverse Current Pair Antenna Applied to Logistics Warehousing

在射频识别系统中,天线的设计会影响整个RFID系统的功能。为增大RFID在物流仓储中的识别区域,保证一个较大区域内稳定的标签识别率,阅读器天线需要在一个较大面积内产生一个均匀的磁场分布。通过设计出一种偶极子反向电流对阅读器天线来解决这个问题。通过测试仿真发现:适当调整新引入电流的相位,增加偶极子对数,可以提高天线区域内磁场分布的均匀度,增大识别范围,消除识别区域的"识别盲区"。该天线仿真结果表明:天线的中心频率为915 MHz,对于-10 dB的端口反射系数的带宽范围为900～945 MHz,增益达到了6 dB。

In RFID systems,the design of the antenna affects the functionality of the entire RFID system.In order to increase the identification area of RFID in logistics warehousing and ensure a stable label recognition rate in a large area,the reader antenna needs to generate a uniform magnetic field distribution in a large area.This paper designed a dipole reverse current pair reader antenna to solve this problem.Through testing simulation,it is found that proper adjustment of the phase of the newly introduced current and increase of the dipole logarithm can improve the uniformity of the magnetic field distribution in the antenna region,increase the recognition range,and eliminate the“identification blind zone”of the identification region.The antenna simulation results show that the center frequency of the antenna is 915 MHz,the bandwidth of the port reflection coefficient of-10 dB is 900-945 MHz,and the gain reaches 6 dB.