L波段空间行波管优化设计  

Optimized Design of Helix Slow Wave Structure of L-Band Space Traveling Wave Tube

作　　者：宋晓霖 李实[1] Song Xiaolin Li Shi(Research and Development Center of Space Traveling- Wave Tubes, Institute of Electronics, Chinese Academy of Sciences, Beijing 101407, China University of Chinese Academy of Sciences, Beijing 1 O0149, China)

机构地区：[1]中国科学院电子学研究所空间行波管研究发展中心,北京101407 [2]中国科学院大学,北京100149

出　　处：《真空科学与技术学报》2017年第9期890-896,共7页Chinese Journal of Vacuum Science and Technology

摘　　要：螺旋慢波结构是螺旋线行波管进行驻波互作用的场所,它的参数设计直接决定了行波管成品的性能,此结构不仅决定了行波管的功率、增益、效率等主特性,也对线性度等副特性的好坏起了至关重要的作用。为了解决L波段行波管的非线性优化问题,本文探究了行波管设计参数对于非线性失真的具体影响。在模拟样管的基础上,主要讨论了工作电压、电流、电子注填充比及各段螺径对群时延失真、调幅调相转换、相移等非线性参量的影响。并在此基础上提出了分段螺径分布提高行波管线性度的设计方法,通过软件MTSS的仿真证明,在基本保障主特性的同时,对线性度的改善效果明显,从而为今后的设计提供了一定的指导意义。Herein,we reported the preliminary design optimization of helix slow wave structure（ SWS） of Lband space traveling wave tube（ TWT）. The influence of the TWT characteristics,including but not limited to the operating voltage,current/filling factor of electron beam,geometry of two-（ three） segment helix SWS,on the nonlinear distortions,such as the group delay,AM-PM and phase shift distortions,wasmathematically modeled,theoretically analyzed and numerically simulated for design optimization and for reduction of nonlinear distortion of the threesegment SWS. The newly-designed SWS was tested via simulation with self-developed software MTSS. The simulated results show that the novel helix SWS significantly reduces the nonlinear distortion of L-band TWT with no negative impact on its performance. We suggest that the analytical results may be of some technological interest in further optimization of the helical SWS.

关 键 词：非线性失真 饱和相移 调幅调相转换 群时延失真 

分 类 号：O462.1[理学—电子物理学]