太赫兹交错栅慢波结构高频特性理论研究  

Theoretical study on high frequency characteristics of terahertz staggered grating slow-wave structure

作　　者：张金睿 张长青 冯进军[1] ZHANG Jin-Rui;ZHANG Chang-Qing;FENG Jin-Jun(Vacuum Electronics National Laboratory,Beijing Vacuum Electronics Research Institute,Beijing 100015,China)

机构地区：[1]北京真空电子技术研究所微波电真空器件国家重点实验室,北京100015

出　　处：《红外与毫米波学报》2021年第2期263-271,共9页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金(61831001)。

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。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.

关 键 词：本征函数法 交错栅 慢波结构 高频特性 数值计算 

分 类 号：TN124[电子电信—物理电子学]