The cutoff wavelength of the rectangular coaxial waveguide in the coupling region is calculated by boundary element method.
其耦合区为矩形同轴波导。 文中用边界元素法对矩形同轴波导的截止波长进行了计算。
2
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;