（英）340GHz倒圆角交错双栅行波管的仿真与冷测

近些年来交错双栅行波管由于其高功率容量和易加工等优点受到了很多的关注。然而随着器件工作频率的升高，尤其对于太赫兹频段，结构的损耗严重限制了行波管的性能。本文考虑了损耗和加工所导致的圆角等因素，针对交错双栅结构提出了一个更切实际的设计。仿真结果表明该行波管在320GHz到342GHz频率范围内能获得大于5W的输出功率。此外采用了相速跳变方法来提高输出功率，在整个工作频带内输出功率都得到了大于28%的提升。在此基础上加工了340GHz交错双栅慢波结构并开展了冷测实验，在330GHz到360GHz范围内盒型窗的S21测试结果大于-2.1dB且电压驻波比在334GHz到355GHz范围内小于1.35。同时对包含盒型窗部件的高频系统进行了冷测，其电压驻波比测试结果在335GHz到344GHz范围内均小于2，且该冷测结果与仿真结果之间趋势基本一致。

Simulation and cold test of a 340 GHz filleted staggered double vane traveling wave tube

Staggered double vane traveling wave tubes have been given a lot of attentions in recent years due to its high power capacity and easy fabrication. However, the loss seriously limits the performance of traveling wave tube with the increasing of frequency, especially in THz wave band. In this paper, a more practical design about staggered double vane structure is proposed with the consideration of the loss and fillets caused by fabrication. The simulation results indicate that the tube with uniform period slow wave structures can obtain over 5W output power in the frequency range from 320GHz to 342GHz. The method of phase-velocity taper is used to enhance the output power and the simulation results show an obvious improvement of the power with more than 28% in the operating wave band. Based on these, the experiment of the fabricated high frequency system with filleted staggered double vane slow wave structure is carried out. The tested S21 of pillbox window is above -2.1 dB in the frequency range from 330GHz to 360GHz and VSWR (voltage standing wave ratio) is below 1.35 in the frequency range from 334GHz to 355GHz. And the tested VSWR of the high frequency system including the pillbox window is below 2 in the frequency range from 335GHz to 344GHz, which matches with the simulation results.