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为解决工作在3 mm波段及以上频段的折叠波导行波管因加工精度和功率容量的局限性,提出了非渐变型有限变周期折叠波导慢波结构.首先给出了这种结构能够有效增大高次空间谐波耦合阻抗的理论基础,并导出了色散和耦合阻抗表达式;然后进行数值计算,给出一组优化后的设计参数,并以此确定行波管的工作点:最后利用MAFIA粒子模拟软件进行大信号互作用模拟,获得有效增益.在结构和周期都比较大的情况下,实现了相对工作电压比较低的行波管设计.
In order to solve the limitation of processing precision and power capacity of the folded waveguide TWTs operating in the 3 mm band and above, a non-gradient finite-periodic folded waveguide SWF structure is proposed. Firstly, The theoretical basis of coupling impedance of large high-order space harmonics and derive the expression of dispersion and coupling impedance. Then, numerical calculation is given and a set of optimized design parameters are given to determine the working point of TWT: MAFIA particle simulation software for simulation of large signal interaction to gain effective gain.When the structure and period are relatively large, the TWT design with relatively low operating voltage is achieved.