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针对一种由Denisov型辐射器和第一面镜为准抛物镜的四级反射镜面系统组成的准光模式变换器开展了详细的研究和设计。利用耦合模理论和矢量绕射理论设计了波纹波导准光模式变化器,通过编写仿真程序进行数值优化完成了140GHz,TE28,8回旋管准光模式变换器的设计。仿真结果表明,抛物面反射镜的焦距对矢量高斯效率影响较大,输出窗口处得到了较好的高斯波束,标量高斯效率达到98%,矢量高斯效率达到90%。
A kind of quasi-optical mode converter consisting of a Denisov radiator and a four-mirror system with the first mirror as a parabolic mirror is studied in detail. The wave guide quasi-optical mode changer is designed by using the coupled mode theory and the vector diffraction theory. The design of the 140 GHz, TE28 and 8 gyro quasi-optical mode converters is completed by programming the simulation program. The simulation results show that the focal length of the parabolic reflector has a great influence on the Gaussian efficiency of the vector and a good Gaussian beam is obtained at the output window. The scalar Gaussian efficiency reaches 98% and the vector Gaussian efficiency reaches 90%.