13.56MHz RFID读写器天线的设计与仿真

为提高13.56 MHz RFID读写器天线的发射效率,并使其天线在实验室易于研发和试制,对13.56 MHz RFID天线系统的工作原理进行了简要介绍,在此基础上,把13.56 MHz RFID读写器天线线圈等效为PCB平面螺旋电感,利用HFSS软件建立模型并仿真得出电感值L、品质因子Q值等参数。其仿真结果得到的电感值与理论计算值相差0.03μH,在可接受的范围内。考虑到实际天线产生的寄生电容,提出了在天线末端加开路补偿线圈的方法,避免因寄生电容产生地电流而使天线线圈的磁场强度降低,仿真结果证实了该方法的可行性。

Design and HFSS Simulation of 13.56 MHz RFID Reader Antenna

To improve the emission efficiency of 13.56 MHz RFID reader antenna and to research and make that antenna much easier in laboratory,the paper is based on the working principle of 13.56 MHz RFID antenna system,and deals with 13.56 MHz RFID reader antenna as the PCB planar spiral inductors,and gets the Inductance value L and the quality factor Q etc.by HFSS simulation.The result of HFSS simulation shows that the difference between the inductance value and the theory value is about 0.03 μH,which is accepted.Considering the parasitic capacitance generated by the actual antenna,this paper refers to add an open-loop coil at the end of the antenna coil so as to avoiding decreasing the magnetic field strength,which is caused by ground current because of parasitic capacitance,yet the result of simulation for the method has been proved feasible.