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| Precise Calculation of the Dispersion and Coupling Impedance of Tape Helix |
| Xiao Liu①②; Su Xiao-bao①; Liu Pu-kun① |
| ①Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China;②Graduate University of Chinese Academy of Sciences, Beijing 100039, China |
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Abstract 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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Received: 01 August 2005
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2007, Vol. 29 
