450 MHz频段动车车顶天线性能与干扰隔离研究

Research on Performance and Interference Isolation of EMU’s Roof-mounted 450 MHz Frequency Band Antennas

450 MHz频段电波传播特性良好,可申请用于铁路下一代移动通信系统,而现有动车组GSM-R车顶天线的间距不能满足450 MHz频段通信系统的干扰隔离需求。首先,研究了450 MHz频段车顶天线在金属平面、金属曲面和金属障碍物等不同场景下的性能;然后,从理论上分析了2个车载通信系统互不干扰所需要的天线隔离度;最后,利用软件仿真和试验台测试得到车顶天线的隔离度与天线间距之间的关系,测试结果与仿真值能够较好吻合。本研究为工程中确定450 MHz频段动车车顶天线的间距提供了一定的参考。

450 MHz frequency band has good radio wave propagation characteristics and can be applied to the next-generation railway mobile communication system.However,the spacing of the existing GSM-R antennas mounted on the roof of the EMU cannot meet the interference isolation requirements of the 450 MHz frequency band communication system.Firstly,the performance of the 450 MHz frequency band antenna in such scenarios as metal planes,metal curved surfaces and metal obstacles are studied.Then,the antenna isolation required for two onboard communication systems without mutual interfere is analyzed theoretically.Finally,the relationship between the isolation of the antennas and their spacing is obtained by using simulation software and test stand.And,the test results are in good agreement with the simulation ones.This research can provide a reference for determining the spacing of 450 MHz antennas mounted on the roof of the EMUs.