Global iterative solution of dielectric spectroscopy equations |
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Authors: | Gelinas S Tran VN Vaillancourt R |
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Affiliation: | Ottawa Univ., Ont.; |
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Abstract: | A global method is presented for solving the permittivity equations for open- and short-circuited coaxial lines of general length for broadband measurements by iterating the recurrence schemes zn+1=c cot zz and z n+1=c tan zn, respectively, and their inverses. The global iteration theory of Fatou and Julia (see J. L. Howland and R. Vaillancourt, Num. Math., vol.46, 323-337, 1985), coupled with linear extrapolation and interpolation and Steffensen's acceleration procedure, supplies starting values and guarantees convergence even near double roots. When RZ⩾0 for open, and RZ⩽0 for short circuit terminations Newton's method, with appropriate starting values, converges to the desired roots. A combination of the three iterative schemes results in an almost global method of solution. Numerical results are quoted |
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