Tp. Iglesias et al., AN ALGORITHM FOR SOLVING ROBERTS-VONHIPPEL EQUATION - SEPARATION OF CLOSE SOLUTIONS, IEEE transactions on instrumentation and measurement, 42(3), 1993, pp. 760-763
The proximity of the solutions of the transcendental equation tanh z/z
= c on the complex plane arising in the determination of the complex
dielectric permittivity with the short-circuited line method is studie
d. A numerical procedure is described which is capable of obtaining th
e required number of solutions, even those lying very close to each ot
her, from one single initial point. The method is applied to measureme
nts of various organic liquids.