中波电台电磁环境影响分析

为了分析广播通信系统中波天线产生的电磁环境影响规律,在麦克斯维电磁场理论的基础上,建立了中波天线场强值的计算模型,并模拟了中波单塔工作模式和双频共塔工作模式的电场分布规律.同时,对北京市郊区某中波电台的电场分布进行了实际测量.结果表明,中波天线电场强度随着水平距离的增加而迅速衰减,电场强度理论值和实测值远小于国家标准,二者的分布规律吻合较好.对中波发射台的环境影响评价工作具有重要的参考价值.

Electromagnetic Environment Analysis of Medium-wave Broadcasting Station

In order to study the environmental influence of the electromagnetic radiation caused by the medium-wave antennas in broadcasting and communication system,the computational model to calculate the electric field strength of the medium-wave antenna has been built based on the Maxwell electromagnetic theories.The distribution of the electric field strength of the medium-wave antennas worked in one tower with one frequency and two frequencies have been simulated.At the same time,we have measured the realistic distribution of the electric field strength at a medium-wave broadcasting station.It drew a conclusion that the electric strength of the antenna decreases quickly with the increase of the horizontal distance.The value of calculating and measure are much less than that of the national standard and both of them are identical well with each other.Results of this paper can provide reference for the environmental evaluation of the electromagnetic environment near medium-wave broadcasting station.