Abstract
Theoretical simulation of the dispersion and interaction impedance characteristics of an inhomogeneously-loaded helical slow-wave structure is validated. The structure is supported by double-curve-shaped rods which are smoothed out into a number of dielectric tubes with their respective effective permittivity values. The effects of the helix thickness are taken into account by considering a free-space gap equal to the difference between the mean helix radius and the outer helix radius. Moreover, the helix tape model is used instead of the simpler sheath-helix model. The theoretical predictions are compared with those of MAFIA simulation. The dispersion error is found to be within 3–6 percent and the impedance characteristic is in great agreement with that of MAFIA simulation. At last, for the sake of comparison, the cold-test characteristics under sheath-helix model are also provided.
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[1] Basu B.N., Pal B.B., SINGH V.N., etc, “Optimum design of a potentially-free helical slow-wave circuit of a broad-band TWT”, IEEE Trans. Microwave theory and techniques, Vol.32, No.4, pp:461–463, 1984.
[2] David Chernin, Thomas M Antoson, Baruch Levush, “Exact treatment of the dispersion and beam interaction impedance of a thin tape-helix surrounded by a radially stratified dielectric”, IEEE Trans. Electron Devices, Vol.46, No.7, pp. 1472–1483, 1999.
[3] Kumar Lalit, Raju R.S., Joshi S.N., Basu B.N., “Modeling of a vane-loaded helical slow-wave structure for broad-band traveling wave tubes”, IEEE Trans. Electron Devices, Vol.36, No.9, pp.1991–1998, 1989.
[4] Kravchenko N.P., Loshakov L.N., Pchel'nikov, Y.N., “Computation of dispersion characteristics of a spiral placed in a screen with axial ribs”, Radio Eng. Electron. Physics, Vol.21, No.1, pp. 33–39, 1976.
[5] Yong Z., Y.L Mo, J.Q Li, and X.L Zhou, “Modeling of finite size vane-loaded helical slow-wave structures”, IEE Proc-Micro.Antennas Propag., Vol.151, No.2, pp. 135–141, 2004.
[6] Basu B.N., Sinha A.K., “Dispersion-shaping using an inhomogeneous dielectric support for the helix in traveling-wave tube”, Int. J. Electron, Vol.50, No.3, pp.235–238, 1981.
[7] Jain P.K., Basu B.N., “The inhomogeneous loading effects of practical dielectric supports for the helical slow-wave structure of a TWT”, IEEE Trans. Electron Devices, Vol.ED-34, No.12, pp.2643–2648, 1987.
[8] Jain P.K., Murty K.V.R., Joshi S.N., Basu B.N., “Effect of the finite thickness of the helix wire on the characteristics of the helical slow-wave structure of a traveling-wave tube”, IEEE Trans. Electron Devices, Vol.ED-34, No.5, pp. 1209–1213, 1987.
[9] Belohoubek E.F., “Helix Support Structure for Ultra-Wide-Band Traveling-Wave Tubes”, RCA Rev., Vol.26, pp: 106–117, Mar 1965.
[10] Kapoor Sunil, Raju R.S., Gupta R.K., etc, “Analysis of an Inhomogeneously-Loaded helical slow-wave structure for broad-band TWt's”, IEEE Trans. Electron Devices, Vol.36, No.9, pp.2000–2004, 1989.
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Zhu, X., Yang, Z. & Li, B. Tape Analysis of an Inhomogeneously-Loaded Helical Slow-Wave Structure for Broad-Band Traveling-Wave Tubes. Int J Infrared Milli Waves 26, 1713–1725 (2005). https://doi.org/10.1007/s10762-005-0292-5
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DOI: https://doi.org/10.1007/s10762-005-0292-5