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提出了一种新型慢波结构—脊加载开放式矩形栅慢波系统。作为一种全金属慢波结构,脊加载开放式矩形栅适用于高功率宽频带的行波管的互作用慢波结构。利用脊相邻面的阶跃条件以及互作用区和加载区的场匹配条件和单模近似法,推导了该结构的色散方程和耦合阻抗表达式。同时,采用软件模拟验证理论分析的正确性,并分析了结构参数对慢波结构慢波特性的影响。数值计算结果表明:在槽深一定的情况下,加载脊可以非常显著地改善该结构的慢波特性,通过优化开放式矩形栅的脊的宽度和厚度等参数来兼顾色散和输出功率等不同设计要求。本文的脊加载开放式矩形栅慢波结构理论研究可以作为高功率行波管设计的理论基础。
A new type of slow-wave structure-ridge-loading open rectangular grid slow-wave system is proposed. As an all-metal slow-wave structure, the ridge-loaded open rectangular grid is suitable for the interaction of slow-wave structures in traveling wave tubes with high power and wideband. The dispersion equation and the coupling impedance expression of the structure are derived by using the step conditions of adjacent surfaces of the ridges and the field matching conditions and single-mode approximation of the interaction and loading regions. At the same time, the correctness of theoretical analysis by software simulation is verified, and the influence of structure parameters on the slow-wave characteristics of the slow-wave structure is analyzed. The numerical results show that the loading ridge can significantly improve the slow wave characteristics of the structure with certain groove depth. Both the dispersion and the output power can be balanced by optimizing the parameters such as the width and thickness of the ridges of the open rectangular grid Design requirements. The theoretical study of the open-loading rectangular grid slow-wave structure in this paper can be used as the theoretical basis for the design of high power TWT.