A dielectric-embedded microstrip meander line slow-wave structure for miniaturized traveling wave tube

Ding Chong, Wei Yanyu, Li Qian, Zhang Luqi, Guo Guo and Gong Yubin

Journal of Electromagnetic Waves and Applications, 2017, vol. 31, issue 17, 1938-1946

Abstract: A modified microstrip meander line (MML) slow-wave structure (SWS) embedded with dielectric rod for miniaturized traveling wave tubes (TWTs) is presented in this paper. High-frequency characteristics, fabrication processes, and beam-wave interaction of the modified MML SWS are analyzed. Compared with conventional MML SWSs supported by dielectric substrate, the modified MML SWS possesses a wider cold bandwidth (about 53.5% increased) and larger interaction impedances (about 21.4% increased). Moreover, this modified MML has better connection with the dielectric, which may improve the slow-wave structure’s stability and reliability under thermal shock, stress impact, and electron bombardment. The beam-wave interaction simulation results indicate that TWTs using the modified MML SWS is capable of delivering 75.85 W saturated output power, corresponding a gain of 28.8 dB and an electron efficiency of 6.32% at the frequency of 35 GHz, with the sheet electron beam of 6000 V and 200 mA.

Date: 2017
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DOI: 10.1080/09205071.2017.1358109

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