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基于不规则波导模式匹配法以及缓变波导中电磁波模式耦合理论,研究了一种W波段圆波导TE62模式激励器.该波导模式激励器采用矩形波导TE10模式通过侧壁耦合馈入同轴波导,利用同轴波导的选模特性激励TE61模式;随后利用轴向半径周期微扰的圆波导实现TE61—TE62模式变换.文中推导了矩形-同轴波导模式匹配理论,系统研究了波导结构缓变参数对模式变换效率的影响,完成了模式变换器的优化仿真设计,数值计算结果表明:中心频率处TE62模式的转换效率为94.5%,纯度为98.16%,效率85%以上带宽达到1 GHz,能够满足回旋管冷测的要求.
A W-band circular waveguide TE62 mode exciter is studied based on the irregular waveguide mode matching method and the slow wave-guided electromagnetic mode coupling theory.The waveguide mode exciter is fed into the coaxial waveguide by using the rectangular waveguide TE10 mode through the sidewall coupling, The TE61 mode is excited by the mode selection of the coaxial waveguide, and then the TE61-TE62 mode conversion is realized by the circular waveguide perturbed by the axial-radius perturbation. The rectangular-coaxial waveguide mode matching theory is deduced, The simulation results show that the conversion efficiency of the TE62 mode at the center frequency is 94.5%, the purity is 98.16%, the bandwidth with the efficiency over 85% is up to 1 GHz, which can meet the requirements of the model conversion efficiency. Gyrotron cold test requirements.