改进型准光模式辐射器
Advanced quasi-optical mode launcher
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摘要: 应用几何光学理论分析了模式在圆柱波导中的传播，利用耦合波理论分析了各个模式在波纹波导中相互转化以及稳定时的相对功率,设计了170 GHz，模式为TE22,6的毫米波通过波纹波导将其一部分能量转换到其它8个卫星模式上，通过编写程序并进行大量优化得出了耦合出的模式和稳定时的相对功率大小，并使它们各个模式场分布在辐射器螺旋切口上叠加成准高斯波束,设计出辐射器的长度少于150 mm,得到准高斯波束在辐射器螺旋切口上叠加的等势图,实现了直接利用这些准高斯波束的目的。Abstract: The quasi-optical mode converter consists of a ripple-wall waveguide launcher, a quasi-elliptical mirror and two toroidal mirrors.The wave beam in the launcher can be described by geometric optics. the coupled-mode theory has been used to analyze the operation of the prebunching waveguide launcher. 170 GHz TE22,6 mode was transform into 8 sattlite modes by the ripple-wall waveguide, and a quasi-Gaussian field was obtained by superposition of the main mode and satelite modes. Then the radiation was launched from the prebunching section by cutting the waveguide wall around a gaussian bundle.The launcher length is less than 150 mm, and the quasi-Gaussian bundle can be used directly.
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