Open AccessLinear theory of the beam-wave interaction in a ridge-loaded folded slow-wave structure
Author(s) -
He Jun,
Yanyu Wei,
Yubin Gong,
Zaihua Duan,
Zhigang Lu,
Wenxiang Wang
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.6659
Subject(s) - traveling wave tube , ridge , optics , physics , cathode ray , bandwidth (computing) , beam (structure) , microwave , signal (programming language) , dispersion (optics) , materials science , electron , amplifier , telecommunications , optoelectronics , geology , paleontology , cmos , quantum mechanics , computer science , programming language
A novel mm-wave high power microwave device, the ridge-loaded folded waveguide traveling wave tube (TWT), is presented and its linear gain properties are investigated. The perturbed dispersion equation is derived and the small signal growth rate is calculated for different dimensions of ridge and parameters of electron beam. For a cold beam, the linear theory predicts a gain of 1.15 dB/period and a 3-dB small-signal gain bandwidth of 18.51% in Kα-band. The investigation reveals that, with the same beam parameters, the novel slow-wave structure (SWS) has advantage over the folded waveguide SWS in its gain and efficiency. The dimensions of ridge and the beam current may be increased in order to raise the gain.