Coupled Cavity Traveling Wave Tube Study Of High Frequency Characteristics

With the deve1opment of vacuum electronic technology, the requirement for the performance of Traveling-wave Tube (TWT) from military electronic industry and commercial use becomes much higher. TWT plays an important role as high power and wide band microwave generator and microwave amplifier. The higher requirement for TWT is also being promoted by modern satellite communication, space communication, phase array radar and etc, from the aspect of smaller size, longer age, and higher reliability and so on.The working frequency of TWT is very high; therefore, the size of TWT slow-wave structure is very fine. This brought much difficulty for the design. Nowadays,more and more computer simulation technology is brought into TWT design work for saving cost and improving design efficiency. It can be applied in each link of TWT design work.For the existence of the coupling components (coupling slots and coupling gaps), the field analysis of coupled-cavity slow-wave structures are more difficult. So the general theoretic method of coupled-cavity slow-wave structures is equivalent circuit analysis. Coupled-cavity equivalent circuit mainly includes the 1965's Curnow model and MKK model in 2003. Which model to be good or bad is not till known, except that D.Dialetis, David.P.Chernin and Simon Jocose had compared them in the cold cavity. However, for their comparison, there are several problems. Firstly, their simulation software is CTLSS. Secondly, the dimensions of their model are not explained. Lastly; the solution equations are also not explained. Therefore, their comparison can not play the role of guidance. In this paper, I hope to improve these.