DIELECTRIC EFFECT ON THE RADIO-FREQUENCY CHARACTERISTICS OF A RECTANGULAR WAVEGUIDE GRATING TRAVELING WAVE TUBE |
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| Authors: | Zhigang Lu Yubin Gong Yanyu Wei and Wenxiang Wang |
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| Institution: | (1) National Key Laboratory of High Power Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu, China, 610054 |
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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. |
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| Keywords: | TWT dielectric-loaded rectangular waveguide grating dispersion coupling impedance |
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