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Volume 29 Issue 3
Jan.  2011
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Xiao Liu, Su Xiao-bao, Liu Pu-kun. Precise Calculation of the Dispersion and Coupling Impedance of Tape Helix[J]. Journal of Electronics & Information Technology, 2007, 29(3): 751-755. doi: 10.3724/SP.J.1146.2005.00957
Citation: Xiao Liu, Su Xiao-bao, Liu Pu-kun. Precise Calculation of the Dispersion and Coupling Impedance of Tape Helix[J]. Journal of Electronics & Information Technology, 2007, 29(3): 751-755. doi: 10.3724/SP.J.1146.2005.00957

Precise Calculation of the Dispersion and Coupling Impedance of Tape Helix

doi: 10.3724/SP.J.1146.2005.00957
  • Received Date: 2005-08-01
  • Rev Recd Date: 2006-01-11
  • Publish Date: 2007-03-19
  • An improved method for evaluating the dispersion and coupling impedance of a tape helix is utilized. The assumption about the surface current density distribution on the tape is avoided by expanding it in a series of Chebyshev polynomials. The propagation matrix and jump matrix are introduced when the dielectric layer is stratified. A program has been written to analyze some typical examples. It is found that the results obtained by computing and measuring agree to good accuracy. The maximal orders of spatial harmonic and Chebyshev expansion can be specified to ensure the convergence of the results. The number of the stratified dielectric depends on the degree of radial uniformity: the more uniform the dielectric, the less the number.
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  • [1] Kartikeyan M V, Sinha A K, and Bandopadhyay H N, et al.. Effective simulation of the radial thickness of helix for broad band, practical TWT's [J].IEEE Trans. on Plasma Science.1999, 27(4):1115- [2] Pierce J R. Traveling Wave Tubes [M]. Princeton Nj: Van Nostrand, 1950: 1949. [3] Freund H P, Zaidman E G, and Antonsen Jr T M. Theory of helix traveling wave tubes with dielectric and vane loading [J].Physics of Plasmas.1996, 3(8):3145- [4] Paul G. Quasi-three-dimensional perturbation technique, including dielectrics for TWT's [J].IEEE Trans. on Electron Devices.1994, 41(3):445- [5] Sensiper S.E1ectromagnetic wave propagation on helical conductors[D]. USA, Dept of E1ectrical Engineering, MIT,1951. [6] Freund H P. Three-dimensional nonlinear theory of helix traveling-wave tubes[J].IEEE Trans. on Plasma Science.2000, 28(3):748- [7] Paul G. Tape helix perturbation including 3-D dielectrics for TWTs[J].IEEE Trans. on Electron Devices.2001, 48(1):12- [8] Chernin D, Antonsen Jr T M, and Levush B. Exact treatment of the dispersion and beam interaction impedance of a thin tape helix surrounded by a radially stratified dielectric [J].IEEE Trans. on Electron Devices.1999, 46(7):1472-1483 [9] Jain P K and Basu B N. The inhomogeneous dielectric loading effects of practical helix supports on the interaction impedance of the slow-wave structure of a TWT[J].IEEE Trans. on Electron Devices.1992, 39(3):727- [10] D'Agostino S, Emma F, and Paoloni C. Accurate analysis of helix slow-wave structures [J].IEEE Trans. on Electron Devices.1998, 45(7):1605- [11] 段兆云,宫玉彬,王文祥等. 考虑螺旋带径向厚度的螺旋线慢波系统的研究. 强激光与粒子束, 2002, 14(6): 905910. Duan Zhao-yun, Gong Yu-bin, and Wang Wen-xiang, et al.. Study of helix slow wave structure taking the radial thickness into account. High Power Laser and Particle Beams, 2002, 14(6): 905910. [12] 段兆云,宫玉彬,王文祥等. 一种具有新型分立介质支撑的翼片加载螺旋带慢波结构的研究. 电子学报, 2004, 32(9): 15151519. Duan Zhao-yun, Gong Yu-bin, and Wang Wen-xiang, et al.. Study of vane-loaded tape helix slow wave structure with novel discontinuous supporting dielectric pillars. Acta Electronica Sinica, 2004, 32(9): 15151519.
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