研究结果显示：矩形隧道电磁波的传播，是由多种模式共同作用的结果。
The results show that a tunnel radio signal consists of a summation of many propagation modes.
当频率较高时，圆形隧道、矩形隧道和拱形隧道的衰减率表达式是一致的；
When frequency is comparatively high, circular tunnel, rectangular tunnel and arched tunnel have same formulation of attenuation rate.
研究UHF频段的无线电波在矩形、圆形和拱形隧道中的传播特性，推导了衰减常数的计算公式。
Propagation characteristic of UHF radio wave in rectangle, circle and arched tunnels is studied in this paper and the computing equation for attenuation constant is deduced.
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