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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。
The spiral slow-wave structure is a place where the standing waves interact with a helical traveling wave tube. Its parameter design directly determines the performance of the traveling wave tube finished product. The structure not only determines the main characteristics of the traveling wave tube such as power, gain and efficiency, Also on the side effects of linearity and other good and bad plays a crucial role. In order to solve the nonlinear optimization problem of L-band TWT, this paper explores the specific influence of TWT design parameters on nonlinear distortion. On the basis of the simulated sample tube, the influences of operating voltage, current, filling ratio of electron injection and the pitch of each section on the group delay distortion, phase modulation and phase shift, phase shift and other nonlinear parameters are mainly discussed. Based on this, a design method of improving the linearity of TWT is presented. The simulation of software MTSS proves that the improvement of linearity is obvious while the basic characteristics of security are basically guaranteed. Provide a certain degree of guiding significance.