Broadbanding of a helical slow-wave structure using chiral dielectric loading

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

doi:10.1109/icimw.2002.1076211

Cited by 2 publications

(4 citation statements)

References 2 publications

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“…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%

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: Introductionmentioning

confidence: 99%

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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“…We propose use of the composite chiral dielectric materials at a regime away from their resonant frequencies, where almost non-dispersive chirality over multi-octave bandwidth is achievable [4,7,8]. This can be achieved by lightly embedding common dielectric materials used as support materials, like, alumina (Al 2 O 3 ), boron nitride (BN), beryllia (BeO), CVD diamond, etc., with chiral inclusions like metallic micro-helices or Mobiüs strips [4][5][6][7][8]. The dispersion relation is derived following sheath-helix field analysis [2,3], and it is seen that chiral dielectric loading could provide negative dispersion, highly desirable for broad banding a helix TWT.…”

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confidence: 99%

mentioning

confidence: 99%

“…1) made of chiral material [4][5][6][7][8], instead of three discrete profiled dielectric support rods, which would be easily implementable and would help appreciably in thermal management as well [7]. We propose use of the composite chiral dielectric materials at a regime away from their resonant frequencies, where almost non-dispersive chirality over multi-octave bandwidth is achievable [4,7,8]. This can be achieved by lightly embedding common dielectric materials used as support materials, like, alumina (Al 2 O 3 ), boron nitride (BN), beryllia (BeO), CVD diamond, etc., with chiral inclusions like metallic micro-helices or Mobiüs strips [4][5][6][7][8].…”

mentioning

confidence: 99%

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

Datta

Jayashree

Veena

et al. 2007

Int J Infrared Milli Waves

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A novel technique of broadbanding a helical slow-wave structure through negative dispersion shaping is proposed. The model considers a simple continuous chiral dielectric support for the helix inside a metallic barrel, unlike conventional helix slow-wave structures with three discrete dielectric supports at 120 0 apart. The dispersion relation of the slow-wave structure was derived following sheath-helix abstraction, suitably benchmarked for special cases, and was used for analyzing the dispersion behavior of a typical slow-wave structure. Chiral dielectric loading could easily provide negative dispersion characteristics (required for broadband operation) by merely controlling the chirality parameter alone. The scheme with its simple geometric configuration is expected to be useful for millimeter-wave devices providing better thermal management.

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Broadbanding of a helical slow-wave structure using chiral dielectric loading

Cited by 2 publications

References 2 publications

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

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

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

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