Title :
Study on millimeter wave folded-waveguide traveling wave tubes with big circular electron beam tunnel
Author :
Qing Zhou ; Wenfei Bo ; Junpeng Liao ; Yabin Zhang ; Hairong Yin ; Zhanliang Wang ; Yanyu Wei ; Yubin Gong
Author_Institution :
Nat. Key Lab. of Sci. & Technol. on Vacuum Electron., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
This paper presents 140-GHz and 220-GHz folded-waveguide(FWG) traveling wave tubes (TWT) with big electron beam tunnels, whose high frequency characteristics and beam-wave interaction are calculated by using equivalent circuit method and 3-D particle-in-cell (PIC) code. From the calculations, the 140-GHz and 220-GHz big beam-tunnel FWG could produce about 25.36dB and 26.94dB gain respectively under the condition of the uniform slow-wave structure(SWS). And with a proper phase-velocity taper used in 220-GHz FWG, the output power at the center frequency is improved up to 85.7W from 61.74W.
Keywords :
electron beams; millimetre wave tubes; slow wave structures; two-dimensional hole gas; waveguide components; 3D particle-in-cell code; FWG TWT; PIC code; SWS; big circular electron beam tunnel; equivalent circuit method; frequency 140 GHz; frequency 220 GHz; high frequency characteristics; millimeter wave folded-waveguide traveling wave tubes; phase-velocity taper; uniform slow-wave structure; Electron beams; Electron tubes; Equivalent circuits; Gain; Impedance; Power amplifiers; Power generation; big electron beam tunnel; folded waveguide (FWG); phase-velocity taper; traveling wave tube (TWT);
Conference_Titel :
Vacuum Electronics Conference, IEEE International
Conference_Location :
Monterey, CA
DOI :
10.1109/IVEC.2014.6857593
