基于波导模式变换的圆波导TE62模式激励器的研究  

Study of a W-band TE_(62) mode generator by the waveguide mode transformation

作　　者：沈文渊[1,2] 王虎[1,2] 耿志辉[1] 杜朝海[3] 刘濮鲲[3] 

机构地区：[1]中国科学院电子学研究所,高功率微波源与技术重点实验室,北京100190 [2]中国科学院大学,北京100190 [3]北京大学信息科学技术学院,北京100871

出　　处：《物理学报》2013年第23期421-427,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61072026,61072024)资助的课题~~

摘　　要：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.In this paper, based on the theory of mode-matching and the coupled wave theory, A W-band TE62 mode generator by using waveguide mode transformation is presented. Because of the eigen-mode selection of coaxial waveguide, a TE1 mode in standard rectangular waveguide is coupled into a coaxial waveguide to excite a TE61 mode by an aperture. A transition follows on it to change the coaxial waveguide into a circular one. Finally, TE61–TE62 mode converter is achieved by using a periodic radius perturbation in circular waveguide. Calculation and analysis of the relationship between the mode conversion efficiency and structure parameters of waveguide also are finished. The validity of this study is confirmed by using electromagnetic simulation software. The conversion efficiency of TE62 mode reaches 94.5% at the center frequency 95 GHz, and the mode purity reaches 98.16% The bandwidth of the efficiency above 85% reaches 1 GHz, which can meet the demand of the high–frequency cold test of gyrotrons.

关 键 词：同轴波导 模式变换 耦合模理论 半径微扰 

分 类 号：TN814[电子电信—信息与通信工程]