Analysis of a Chiral Dielectric Supported Broadband Helix Slow-Wave Structure for Millimeter-Wave TWTs

Datta, S. K.; Jayashree, E.V.; Veena, S. D.; Kumar, Lalit

doi:10.1007/s10762-007-9260-6

Cited by 6 publications

(2 citation statements)

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“…Figure 4 clearly shows that the dispersion relations turn from positive to negative with h/a decreasing. As the negative dispersion is a desired behavior required for achieving multi-octave bandwidth in a TWT [10], structure II can meet this requirement by adjusting h/a of T-shaped metallic vanes. When h/a is 1.8, there is a turning point and the negative dispersion is resulted.…”

Section: Effects Of Different Metallic Vane-loaded Helix Sws On Slow-mentioning

confidence: 99%

“…To obtain excellent helix dispersion characteristics, the practices have been to load the anisotropic dielectric support rods and metallic vanes. Many studies on the evaluation of rod effects on helix SWS performances were presented in the past [1][2][3][4][5][6][7][8][9][10]. They used the various approximated methods to account for the highly non-homogeneous exterior medium, ranging from the simple averaging or "smearing" of dielectric evenly over the entire exterior, to more sophisticated approaches in which the averaging is done in the azimuthal but not in the radial direction [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Study on Effects of Different Metallic Vane-Loaded Helix Slow-Wave Structures in Traveling-Wave Tubes

Yang

Zhang

Cai

et al. 2009

J Infrared Milli Terahz Waves

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The effects of different metallic vane-loaded helix slow-wave structures of a traveling-wave tube are proposed based on the analysis of the Fourier expansions of the exterior region with metallic vanes. The influences of the metallic vanes dimensions on the phase velocity and interaction impedance are considered in detail. The computed data is compared with the reference data in the 0−16 GHz frequency range with a good consistency. The analytical results reveal that the method of using Fourier expansions can contribute effectively to the reducing of the error between the theoretical and experimented data (around 1.2%). By analyzing the computed results, the performances of the helix slowwave structure, with T-shaped metallic vanes are superior to the sector-shaped with the same designed parameters. Adjustments can be made to the outer radius of T-shaped metallic vanes which then control the dispersion relation showing either negative or positive, and it is similar to sector-shaped vanes by adjusting its inner radius. And with increasing the distance between the helix and metallic vanes, the dispersion characteristics and interaction impedance of the helix slow-wave structure with T-shaped/sector-shaped metallic vane are all improved.

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Section: Effects Of Different Metallic Vane-loaded Helix Sws On Slow-mentioning

confidence: 99%