运用模式匹配法,分析了圆-圆形槽波导结的散射特性.在圆-圆形槽波导结上匹配电场和磁场的边界条件,然后在边界方程两边同乘以圆波导和圆形槽波导的模式方程,得到了散射矩阵方程,结的散射系数可由此方程得出.然后分析了圆形槽波导中放置圆形膜片的散射特性.最后讨论了数值计算结果的收敛性;当选择恰当的模式组时,得到了收敛的数值结果,同时给出了膜片散射系数的频率响应结果. The mode matching method is used to analyze the scattering characteristics of the circular-slotted waveguide junction. The boundary conditions of the electric field and the magnetic field are matched on the circular-slotted waveguide junction, and then multiplied by the circular waveguide and the circular slotted waveguide on both sides of the boundary equation , The scattering matrix equation is obtained, and the scattering coefficient of the junction can be derived from the equation. Then the scattering characteristics of the circular diaphragm in a circular slot waveguide are analyzed. Finally, the convergence of numerical results is discussed. The numerical results of the convergence are obtained, and the frequency response of the scattering coefficient of the diaphragm is given.