波纹外壳微带线平面小型化宽带行波管的研究

Investigation on Miniaturized Broad Bandwidth Corrugated Shell Microstrip Planar TWTs

行波管是一种重要的微波功率放大器,随着微波电子技术的不断进步,平面化、小型化成为未来行波管的必然发展趋势。本文基于传统微带型慢波结构,提出了波纹外壳微带线慢波结构,设计了一种工作于Ka频段的低电压、大带宽的新型平面小型化行波管慢波结构。利用HFSS和CST-MWS对该结构和传统微带型慢波结构行波管的高频特性进行了仿真,并对二者的仿真结果进行了对比,验证了新型慢波结构具有更宽的工作带宽和更低的工作电压。同时,本文还给出了波纹外壳微带线行波管的注-波互作用仿真结果,仿真结果显示:该行波管最大输出功率为25. 2 W,对应的增益和电子注效率分别为23d B和7. 9%,相对带宽为36. 6%。

The travelling wave tube(TWT) is a kind of microwave power amplifier. With the progress of microwave electronic technology, planarization and miniaturization have become the necessary development direction for future TWTs. Based on traditional microstrip slow wave structures(SWSs), we propose a corrugated shell microstrip SWS and design a novel Ka-band planar miniaturized SWS with low operation voltage and wide bandwidth. The high frequency characteristics simulation of the novel microstrip SWS by HFSS and CST-MWS shows that it has wider operation bandwidth and lower operation voltage when compared with the traditional microstrip SWSs. The beam-wave interaction simulation results show that the maximum output power is 25.2 W, the gain is 23 dB, the electronic beam efficiency is 7.9%, and the relative bandwidth is 36.6%.