The effects of cage in mine tunnel on the cutoff frequency is analyzed by the finite-element method when the tunnel is regarded as a waveguide, and the numerical results are obtained.
把矿井隧道看作波导，利用有限元法分析了隧道中的罐笼对电磁波截止频率的影响，并得到数值结果。
The results show that the cutoff frequency of the rectangular waveguide tube with the same equivalent radius is far greater than that of the cylindrical tube.
理论研究结果表明：对于同样等效直径的矩形谐振管，其截止频率远大于圆形谐振波导管的截止频率；
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