Propagation characteristic of UHF radio wave in rectangle, circle and arched tunnels is studied in this paper and the computing equation for attenuationconstant is deduced.
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。
2
Furthermore, the formulae of transmitted power, loss power, attenuationconstant and equivalent impedance for TM and te modes are deduced.
此外，推导出波导tm、TE模的传输功率、损耗功率、衰减常数、等效阻抗等特征参数的边界元公式。
3
In order to solve the problem, the calculation formula of microwave attenuationconstant and phase constant of weakly ionized dusty plasma was deduce.