太赫兹交错栅慢波结构高频特性理论研究
投稿时间:2020-07-30  修订日期:2020-09-22  点此下载全文
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作者单位E-mail
张金睿 北京真空电子技术研究所 14021202@buaa.edu.cn 
张长青 北京真空电子技术研究所  
冯进军 北京真空电子技术研究所 fengjinjun@tsinghua.org.cn 
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:基于本征函数法对G波段交错栅慢波结构的高频特性建立了理论模型,考虑空间谐波级数项收敛后,计算得到了色散曲线和耦合阻抗以及损耗参量并采用仿真软件对计算结果进行了验证。对比发现理论模型计算的高频特性与仿真结果吻合较好,色散误差小于0.1%,耦合阻抗误差小于10%,损耗误差小于10%,可信度较高。研究结果表明,该模型对于拥有任意交错距离和上下栅高度的双栅结构具有普适性,在两种极限情况下可分别化为对齐双排矩形栅和矩形波导栅慢波结构。交错栅高频损耗主要发生在注通道区域,槽区底部损耗最小。
中文关键词:本征函数法  交错栅  慢波结构  高频特性  数值计算
 
Theoretical study on high frequency characteristics of terahertz staggered grating slow-wave structure
Abstract:A theoretical model of high frequency characteristics of staggered grating slow-wave structure at G band frequency is presented based on the eigen function method. Considering the convergence of spatial harmonic series, the loss parameters well as dispersion curve and coupling impedance are then derived and verified by simulation software. The results of the theoretical model match well with those from simulation, the error of dispersion characteristics is less than 0.1%, and the errors of coupling impedance and loss are both less than 10%, which proves the reliability of the theoretical model. It shows that the model is universal for structures with arbitrary staggered distance or different grating height and can be converted to double grating or rectangular waveguide grating in two extreme cases. The loss mainly occurred on the beam tunnel region of the structure and there is less loss on the top and bottom of slot area.
keywords:eigen function method  staggered grating  slow-wave structure(SWS)  high frequency characteristics  numeral calculation
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