梯形隧道中横截面尺寸对电磁波传播特性的影响

Effects of Cross Section Dimensions on Propagation Characteristics in Trapezoid Tunnel

采用有限元法分析了梯形隧道中横截面尺寸对传输特性的影响。分别对梯形隧道上边宽度、下边宽度和高度尺寸的变化对主模和最低次高阶模截止频率及通信带宽的影响进行了研究,并得出结论:梯形隧道中上边宽度、下边宽度和高度的增大会使隧道中电磁波截止频率降低;在隧道下边宽度增加或者隧道高度减小的情况下会得到较大的通信带宽。

The effect of cross section dimension on propagation characteristics in trapezoid tunnel is analyzed using finite element method. By varying the dimension of top side, bottom side, height, the cutoff frequency for dominant mode and the mode next to dominant and bandwidth in trapezoid tunnel are studied respectively. It comes to a useful conclusion that the increasing of top side, bottom side, height decrease the cutoff frequency and longer bottom side or lower height result in larger bandwidth.