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详细研究了Denisov型准光模式变换器的原理和设计方法。应用几何光学理论对Denisov型开口辐射器的工作过程进行了分析，并给出了基于耦合模理论的辐射器不规则扰动段的设计方法。开发了基于耦合模理论、矢量衍射积分和物理光学法的仿真程序 GQOMC-D，并将该程序的计算结果与文献报道结果进行了对比验证。利用该程序设计了一种110 GHz TE22，6模回旋振荡管准光模式变换器，仿真结果显示在输出窗上得到了场型较好的高斯波束，其模式纯度为98．4％，模式变换器的能量转换效率为94．7％。“,”The principle and design method of Denisov-type quasi-optical mode converter is investigated in detail.The operation process of the Denisov-type launcher is analyzed by applying the geometrical optics,and the Gaussian-like field distribution achieved on the waveguide wall is also derived.The method for designing a rippled-wall launcher is proposed on the basis of coupled mode theory.A simulation code for Denisov-type qua-si-optical mode converter GQOMC-D is developed based on coupled mode theory,vector diffraction integration and physical optics,which is compared to the design parameters and experimental results reported in literature for its validity.According to this code,a Denisov-type quasi-optical mode converter used in 110 GHz TE22 ,6 mode gyrotron oscillators is designed.Simulation results indicate that a Gaussian-like beam is obtained at the output window with a scalar content of 98.4% and a conversion efficiency of 94.7%.