DIELECTRIC EFFECT ON THE RADIO-FREQUENCY CHARACTERISTICS OF A RECTANGULAR WAVEGUIDE GRATING TRAVELING WAVE TUBE

Authors: Lu, Zhigang; Gong, Yubin; Wei, Yanyu; Wang, Wenxiang

Source: International Journal of Infrared and Millimeter Waves, Volume 27, Number 8, August 2006 , pp. 1095-1108(14)

Publisher: Springer

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Abstract:

A new type of partial-dielectric-loaded rectangular waveguide grating slow-wave structure (SWS) for millimeter wave traveling wave tube (TWT) is presented in this paper. The radio-frequency characteristics including the dispersion properties, the longitudinal electric field distribution and the beam-wave coupling impedance of this structure are analyzed. The results show that the dispersion of the rectangular waveguide grating circuit is weakened, the phase velocity is reduced and the position of the maximum E _z is basically invariant after partially filling the dielectric materials in the rectangular waveguide grating SWS. Although the coupling impedance decreases a little, it still keeps above 40 Ω.

Keywords: TWT; dielectric-loaded; rectangular waveguide grating; dispersion; coupling impedance

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10762-006-9161-0

Publication date: 2006-08-01