嵌入豁口磁芯的13.56MHz RFID读写器天线

13.56MHZ RFID Reader Antenna Embedded in the Gap Magnetic Core

本文针对天线线圈产生的磁场强度分布不均匀的现象,提出一种增强天线局部磁场强度的方案.首先,本文从理论出发解释了高频磁场的趋肤效应;其次,基于高频磁场的趋肤效应,提出往线圈中央添加开了豁口的金属磁芯,用以增强磁芯边缘和豁口位置的磁场强度;最后,通过三维电磁仿真软件Ansoft HFSS和MATLAB软件研究不同张角的豁口磁芯对环形天线的磁场强度的影响,旨在找出最优豁口的设计方案,对实际设计的13.56MHz RFID读写器天线具有一定的参考价值.

For the phenomenon that the distribution of magnetic field intensity caused by antenna coil is non-uniform, this article puts forward a solution to enhance the local antenna＇s magnetic field intensity. First of all, this article explains the skin effect of high frequency magnetic field from the theory. Then, based on the skin effect of high frequency magnetic field, we add a gap magnetic metal core in the central coil in order to enhance the magnetic field strength. Finally, the influence of the different opening Angle of the gaps magnetic core on the magnetic field strength of loop antenna is studied by using 3D electromagnetic simulation software Ansoft HFSS and the MATLAB software, to find out the optimal design scheme of gaps. This has a certain reference value for the actual design of the antenna in13.56 MHz RFID reader systems.