中文摘要：

针对半圆拱形巷道中电磁波的衰减率无法通过经典波导模型理论得到精确解。采用等效分析方法,利用矩形巷道最低衰减模式等效半圆拱形巷道中的最低衰减模式,可以近似分析半圆拱形巷道中电磁波衰减率的情况。等效结果表明,对于较大尺寸的半圆拱形巷道,使用等面积等形状因子的矩形巷道等效效果最好,在900-1000MHz频段与计算衰减率的误差率很小,频率越大,效果越明显;对于较小尺寸的半圆拱形巷道,使用等面积等形状因子和等面积定形状因子k=1.7的矩形巷道等效效果较好,在900-1000MHz频段与计算衰减率的误差率很小。研究证明这种等效方法是可行的。

英文摘要：

As the electromagnetic wave propagation attenuation in the semi- circular arched can＇t be obtained with classical waveguide theory,an equivalent analysis method was proposed,based on the minimum attenuation mode of the rectangular roadway,to approximately calculate that of semi- circular arched roadway.The results show that,for the large semi-circular arched roadway,the equivalence result of rectangular roadway with equal area and shape factor is the best,and the error rate is very small with the frequency band of 900 MHz to 1000 MHz,the greater the frequency,the smaller the error rate is; for the small roadway,the equivalence result is the best with equal area and shape factor,and the equal area and fixed shape factor k = 1.7.