铁路隧道中漏泄同轴电缆辐射场分布的计算

Calculation of the electrical field distribution of a leaky coaxial cable in a railway tunnel

漏泄同轴电缆外导体上周期开缝的结构能够有效地将射频能量均匀分布在一定的范围内 ,并延伸电波的作用距离 ,因此漏缆被广泛应用于隧道、地道中的无线通信。本文对架设有漏缆的铁路隧道中火车天线所在位置处的电波情况进行分析 ,不仅考虑了不同频率下的电场分布图 ,还分析了不同隧道壁材质对电波分布的影响。

The leaky coaxial cable with periodic slots in the outer conductor can spread the RF energy within confined areas sufficiently and extend the effect distance. Therefore, they are widely used in tunnels and underpasses for wireless communications. In this paper, the properties of the electrical field at the location of the antenna on the roof of the train along a leaky coaxial cable installed in a tunnel are analyzed. The field distributions of a cable with difference frequencies are considered and the effects of material of the tunnel walls on the field distributions are discussed.