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针对高效率耦合腔行波管提出一种正向设计的初步方法,可根据设计指标对其慢波结构进行快速的定量设计。其设计思想是在满足带宽内的注波互作用同步条件的基础上,尽可能提高总阻抗。为此提出“带宽相速差之比”参量来描述带宽与同步的关系,并以此参量和Curnow等效电路模型分析了休斯型耦合腔慢波结构的各个参量变化对带宽和总阻抗的影响情况,从而建立慢波结构的正向设计过程;使用这种设计方法,针对给定的Ka波段的耦合腔行波管参数指标进行快速设计,设计结果基本满足指标要求。
Aiming at the initial design of a high efficiency coupled cavity TWT, a preliminary design method based on the design index is proposed to quickly design the slow wave structure. Its design idea is to satisfy the synchronous condition of wave-wave interaction in the bandwidth, and to improve the total impedance as much as possible. Therefore, we proposed the relationship between bandwidth and synchronization by using the ratio of bandwidth and phase velocity difference. Based on this parameter and the Curnow equivalent circuit model, we analyzed the change of various parameters of the slow-wave structure of Hughes-type coupling cavity, Impedance and so on, so as to establish the forward design process of the slow-wave structure. With this design method, the fast design of the coupled cavity TWT parameters for a given Ka-band is achieved. The design results basically meet the requirements of the index.