A dielectric-embedded microstrip meander line slow-wave structure for miniaturized traveling wave tube. Issue 17 (22nd November 2017)

• Record Type: Journal Article
• Authors: Chong, Ding; Yanyu, Wei; Qian, Li; Luqi, Zhang; Guo, Guo; Yubin, Gong
• Is Part Of: Journal of electromagnetic waves and applications. Volume 31:Issue 17(2017)
• Page Start: 1938
• Page End: 1946
• Publication Date: 2017-11-22
• Subjects: Microstrip meander line -- slow-wave structure -- traveling wave tube -- millimeter-wave -- selective laser sintering; Electromagnetic waves -- Periodicals; Electromagnetic devices -- Periodicals; 621.3
• DOI: 10.1080/09205071.2017.1358109
• Languages: English
• ISSNs: 0920-5071

Abstract

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.