而考虑边界条件以后，出现了这样两个特征：在B-T理论截止频率以外的一些小纹波依然有一定的增益；
Taking into account the boundary conditions, two results were gotten: 1) The nonlinear medium provides gain to small ripples which is beyond the Bespalov-talanov cutoff spatial frequency;
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；
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.
从基本特征方程式出发，理论上导出了两组非耦合的求解截止频率的方程式；
Based on the basic characteristic equation, two uncoupled equations for cutoff frequencies were obtained theoretically.
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