Open AccessLinear analysis of the dielectric-loaded folded waveguide traveling-wave tube amplifier
Author(s) -
Changqing Zhang,
Yubin Gong,
Yanyu Wei,
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.59.6653
Subject(s) - traveling wave tube , amplifier , dispersion relation , beam (structure) , waveguide , dielectric , optics , conductor , signal (programming language) , physics , dispersion (optics) , materials science , mechanics , optoelectronics , cmos , composite material , computer science , programming language
In this paper a dielectric-loaded folded waveguide slow-wave circuit is presented. The "hot" dispersion relation for slow wave interaction between the traveling wave and linear beam is derived from the fluid dynamical treatment. In the special case where εr=1, the dispersion relation can be simplified with a closed form of the conventional Pierce’s small-signal equation, which confirms the validity of the derivations. By giving the specific parameters, the effects of dielectric loading on the small-signal gain have been studied. The results indicated that in the case of "weak loading" (where d/a<0.1), the gain is flattened and there is no need to readjust the structure parameters beyond a slight adjustment of beam parameters. By considering that the "weak loading" can reduce the ohmic loss of the conductor, this study will be also a guide to the research of the THz folded waveguide traveling-wave tube.