Ka波段500W螺旋线行波管返波振荡抑制的设计和计算  

Research on the Depression of Backward-Wave Oscillation in a 500W Ka-Band Helix TWT

作　　者：周璐[1] 冯源[1] 唐烨[1] 陈波[1] 冯进军[1] 

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：《真空电子技术》2015年第2期28-30,45,共4页Vacuum Electronics

摘　　要：本文针对Ka波段500 W螺旋线行波管的高频结构,通过软件计算色散和返波耦合阻抗,求出了返波振荡的起振电流与高频长度的关系,利用粒子模拟软件仿真证明固定螺距的高频结构存在返波振荡,不能满足设计要求。在此基础上,设计了一种螺距渐变的高频结构,通过粒子模拟证明其可以有效抑制返波振荡,为行波管的研制提供了设计指导。The dispersion and coupling impedance of the slow wave structure of a 500 W Ka-band Helix TWT are calculated. The relationship between the starting current of backward wave oscillation and the length of slow wave structure are also evaluated. Through particle in cell simulation, it is proved that there is backward wave oscillation existing in the fixed pitch model and the structure cannot meet the design requirements. A kind of graded pitch slow wave structure is designed and it is demonstrated that the structure can effectively depress the backward wave oscillation. This research can provide the design guidance to the development of TWT.

关 键 词：螺旋线行波管 螺距渐变 返波振荡 

分 类 号：TN124[电子电信—物理电子学]