为了提高传统交错双栅慢波结构行波管的性能, 提出了一种阶梯型交错双栅慢波结构, 并基于此新型慢波结构, 提出了新型输入输出耦合结构.在此基础上, 设计了一只工作在W波段的带状电子注阶梯型交错双栅慢波结构行波管.计算结果显示, 阶梯型交错双栅慢波结构行波管的耦合阻抗更高, 从而使行波管在更短的互作用电路长度里, 实现更高的饱和增益和互作用效率.在90~100 GHz频率范围内, 阶梯型交错双栅慢波结构的耦合阻抗大于4 Ω, 高于传统交错双栅慢波结构；W波段带状电子注行波管高频结构的反射系数(S11)小于-15 dB；并且行波管的饱和输入功率仅约为0.7 W, 可以实现最高输出功率约800 W, 相应的效率大于7.8%, 增益大于30.6 dB.

In order to improve the performance of traditional staggered double vane (SDV) traveling wave tube (TWT), a new kind of step-type staggered double vane (SSDV) slow wave structure (SWS) is proposed, and a new type of input/output coupling structure is designed based on this novel SWS. Moreover, a W band sheet electron beam SSDV SWS TWT is designed in this work. The calculation results show that the SSDV SWS TWT has a higher interaction impedance, so that it can achieve a higher saturated gain and higher interaction efficiency in a less interaction circuit length. In the frequency range of 90~100 GHz, the interaction impedance of SSDV SWS is greater than 4 Ω, which is higher than the traditional SDV SWS. The reflect ratio (S11) of high frequency structure of W band sheet electron beam TWT is less than -15 dB. Moreover, the saturated input power of the traveling wave tube is only about 0.7 W, and the maximum output power can be about 800 W, the corresponding efficiency is more than 7.8%, and the gain is more than 30.6 dB.