To describe the propagation characteristics of the electromagnetic wave accurately, the theory of Fresnel propagation and geometry are adopted to derive the calculation formulas of the boundary points of the electromagnetic wave propagation in the different position of the receiving and sending antenna.The simulation is taken in general arched tunnels,and the best position of the antenna is obtained which is the most conducive to the propagation of electromagnetic waves.%为精确描述电磁波传播特性,运用Fresnel传播理论与几何知识,推导出收、发天线安装在不同位置时电磁波传播近场区分界点的计算公式,并在一般拱形巷道中进行仿真分析,得到最有利于电磁波传播时,天线的最佳位置.
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