输电线路对5G共享AAU的电磁干扰仿真分析及屏蔽设计

Simulation Analysis and Shielding Design of Electromagnetic Interference of Transmission Lines to 5G Shared AAU

我国电力基础资源丰富,若将5G设备与电力杆塔共建共享,可以大幅降低5G基站建设成本并实现电力基础资源的综合利用。然而高压输电线路会对5G设备产生电磁干扰,为保证5G设备安全稳定运行,需要开展高压输电线路对5G设备电磁场干扰分析及屏蔽设计研究。以电力共享杆塔悬挂5G设备有源射频单元(active antenna unit,AAU)为研究对象,提出了解析法和有限元法相结合的方法,利用该方法仿真分析了高压输电线路对共享杆塔挂载5G设备电磁干扰,在此基础上设计AAU的电磁屏蔽结构,并提出了电磁屏蔽效能的评价方法。仿真结果表明:经过对AAU设备进行电磁场屏蔽结构设计后,5G设备在共享杆塔的不同挂载高度,电磁屏蔽效能均高于81 dB,磁场屏蔽效能均高于32 dB。说明经过电磁屏蔽的AAU设备可适用不同的杆塔的多种安装高度,从而提高AAU设备的环境适用性。

China is rich in basic power resources,and if 5G equipment and power towers are jointly built and shared,the construction cost of 5G base stations can be greatly reduced and the comprehensive utilization of basic power resources can be realized.However,high voltage transmission lines produce electromagnetic interference to 5G equipment.To ensure the safe and stable operation of 5G equipment,it is necessary to carry out electromagnetic field interference analysis and shielding design research of 5G equipment caused by high-voltage transmission lines.With the active antenna unit(AAU)of 5G equipment suspended on power sharing tower taken as the research object,a method combining analytical method and finite element method is proposed.Using this method,the electromagnetic interference of high-voltage transmission lines to 5G equipment mounted on shared towers is simulated and analyzed.On this basis,the electromagnetic shielding structure of the AAU is designed,and the method of evaluating electromagnetic shielding effectiveness is proposed.The simulation results show that with the electromagnetic field shielding structure design of the AAU equipment,the electromagnetic shielding efficiency of 5G equipment at different mounting heights of shared towers is higher than 81db,and the magnetic field shielding efficiency is higher than 32dB.It shows that the AAU equipment with electromagnetic shielding can be applied to various installation heights of different towers,so as to improve the environmental applicability of the AAU equipment.