Showing papers by "Yanyu Wei published in 2000"
TL;DR: In this paper, the expressions of the dispersion equation and the coupling impedance of the hole-gap helical groove waveguide were obtained by means of an approximate field theory, and the influence of various circuit dimensions on dispersion relation and coupling impedance was discussed by the numerical computation.
Abstract: The hole-gap helical groove waveguide, as a all-metal slow-wave circuit, has advantages of good heat dissipation and great size, and thus is suitable for use of mm TWT. By means of an approximate field theory, the expressions of the dispersion equation and the coupling impedance of the hole-gap helical groove waveguide is obtained in this paper. The influence of various circuit dimensions on the dispersion relation and the coupling impedance is discussed by the numerical computation.
6 citations
TL;DR: In this article, the dispersion curves and coupling impedances of the fundamental wave and some harmonics are calculated and the influences of various circuit dimensions are discussed, showing that the bandwidth can be improved by increasing the arc angle or decreasing the pitch of the structure; a 50% bandwidth is achieved by deviating the phase velocity within ±5%.
Abstract: This paper concerns a new circular-arc-shaped helical groove all-metal structure, and emphasizes the propagation characteristics of the slow wave. By using approximate field-matching conditions, the dispersion equation and the coupling impedance of this circuit are obtained. The dispersion curves and coupling impedances of the fundamental wave and some harmonics are calculated and the influences of various circuit dimensions are discussed. The calculation results show that the bandwidth can be improved by increasing the arc angle or decreasing the pitch of the structure; a 50% bandwidth is achieved by deviating the phase velocity within ±5%. As a new slow-wave structure for a travelling wave tube, this circuit has an attractive feature, namely the bandwidth is broad while power capacity is high.
2 citations