TE 30高次模式工作改进型交错栅结构及互作用结构  

An Improved Staggered Double Vane Slow Wave Structure and Its Interaction Structure Working on TE 30 High-order Mode

作　　者：刘金亮 张长青 赵士录[1] 蔡军[1] 冯进军[1] LIU Jinliang;ZHANG Changqing;ZHAO Shilu;CAI Jun;FENG Jinjun(National Key Laboratory of Science and Technology on Vacuum Electronics,The 12th Research Institute of China Electronics Technology Group Corporation,Beijing 100015,China)

机构地区：[1]中国电子科技集团公司第十二研究所微波电真空器件国家级重点实验室,北京100015

出　　处：《微波学报》2025年第1期63-69,共7页Journal of Microwaves

基　　金：国家自然科学基金(62131006,61831001,61921002,92163204)。

摘　　要：随着行波管的工作频段不断向太赫兹频段发展,尺寸共渡效应的影响越来越明显,主要表现为慢波结构的横向尺寸和电子注通道的宽度不断减小,不仅造成了加工工艺难度的提升,也导致了工作电流的减小以及耦合阻抗的下降,严重影响了行波管性能,而工作在高次模式的过模行波管能有效解决这一问题。文中研究了过模交错栅的工作特性,并针对低次模式竞争及返波振荡等问题,提出了一种改进型交错栅。该结构工作在高次TE 30模式,相比于同频段工作在基模的电路,其横向尺寸和电子注通道高度分别扩展了3倍和2倍。模式分析的结果表明,新结构在相对较低的工作电压下能够有效抑制返波振荡和模式竞争。基于新型结构设计了两段式高频电路。PIC仿真表明,在26 kV电压、两个150 mA带状注的工作条件下,在217 GHz频率上可以获得103.5 W的功率输出,增益为19.6 dB,频谱分析结果表明工作稳定,无振荡发生。该工作对过模行波管的研制具有指导意义。As the operating frequency band of traveling wave tubes continues to advance into the terahertz frequency band,the influence of the size co-transit effect is becoming more and more obvious,which is mainly manifested in the continuous reduction of the transverse size of the slow wave structure and the width of the electron beam channel,resulting in the improvement of the processing difficulty,the reduction of the operating current and the decrease of the coupling impedance,which seriously affects the performance of the traveling wave tubes.Over-mode traveling wave tubes operating in higher order mode can solve this problem effectively.In order to solve the problems of low-order mode competition and back-wave oscillation,an improved staggered double vane slow wave structure is proposed.This structure works in high-order TE 30 mode.Compared with the basic mode circuit operating in the same frequency band,the transverse size and channel height are extended by 3 times and 2 times,respectively.The results of mode analysis show that the new structure can effectively suppress back-wave oscillation and mode competition at relatively low operating voltage.Based on the new structure,a two-stage high frequency circuit is designed.PIC simulation shows that the power output of 103.5 W can be obtained at 217 GHz with a gain of 19.6 dB at 26 kV voltage and two 150 mA sheet-beams.The spectrum analysis results show that the operation is stable and no oscillation occurs.This work has guiding significance for the development of over-mode traveling wave tubes.

关 键 词：太赫兹 过模 尺寸共渡效应 慢波结构 返波振荡 

分 类 号：TN124[电子电信—物理电子学] TN16