时速350km中国标准动车组车载天线的隔离度及最小排布间距

基于中国标准动车组车载终端设备的部署现状和未来规划,调研其采用的通信系统类型、车载天线的工作频率和安装数量;以900 MHz频段GSM-R系统、450 MHz频段和2100 MHz频段LTE-R系统为例,对车载终端的杂散干扰进行理论分析,基于自由空间损耗理论模型计算、电磁软件仿真模拟和试验平台实测的结果,研究车载天线的隔离度,提出满足车载通信终端干扰隔离度需求的合理天线间距。结果表明:为了实现动车组车载终端的互不干扰,对于900 MHz频段GSM-R系统和2100 MHz频段LTE-R系统,车载天线间距需达到0.5 m;对于450 MHz频段LTE-R系统,车载天线间距则需大于3.0 m。未来我国动车组车载天线的发展应定位在:研发宽频段多业务组合天线、对车载天线布局进行标准化设计、支持公网运营商5G频率等方面。

Isolation between Vehicle-Mounted Antennas for 350 km·h^?1 Chinese Standard EMU and Minimum Spacing

Based on the current deployment and future planning of the vehicle-mounted terminals in Chinese standard EMU,the type of communication system,working frequency and number of vehicle-mounted antennas are investigated.Taking the GSM-R system of 900 MHz band,the LTE-R system of 450 MHz band and 2100 MHz band as examples,the stray interference of vehicle-mounted terminals is theoretically analyzed.Based on the the theoretical model calculation of free space loss,the electromagnetic software simulation and the measured results of the test platform,the isolation of vehicle-mounted antennas is studied and a reasonable antenna spacing is proposed to meet the needs for the interference isolation of vehicle-mounted communication terminals.Results show that in order to achieve the non-interference between the vehicle-mounted terminals of the EMU,for the 900 MHz band GSM-R system and the 2100 MHz band LTE-R system,the vehiclemounted antenna spacing must reach 0.5 m;for the 450 MHz band LTE-R system,the vehicle-mounted antenna spacing should be greater than 3.0 m.In the future,the development of the vehicle-mounted antennas for EMUs in China should be positioned in the following aspects:researching and developing combined wideband multi-service antennas,standardizing the layout of vehicle-mounted antennas and supporting 5G frequency of public network,etc.