【摘要】 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。得知罐笼的存在使TE模式的截止频率降低 ,而使TM模式的截止频率升高 ,而且随着罐笼尺寸的增加 ,TE模式的截止频率缓慢下降 ,TM模式的截止频率则迅速上升 ,这种趋势越来越明显。对于TM模式来说 ,当罐笼与隧道的截面之比接近于 1时会出现模式简并。更多还原

【Abstract】 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. The cage in tunnel lower TE mode cutoff frequency and raise TM mode cutoff frequency. AS the area of cage becomes larger,the TE mode cutoff frequency falls slowly and TM mode cutoff frequency raises rapidly. When the cross-section ratio of cage and tunnel is close to one, the model degeneration of TM mode appears.更多还原