We develop a numerical method of determining the magnitude of characteristic impedance required by causal power-normalized circuit theories from its phase using a Hilbert-transform relationship. We also estimate the uncertainty in the method.
and Wittmann, R.
Computation of Causal Characteristic Impedances, IEEE MTT-S Intl. Symp., Boston, MA, [online], https://doi.org/10.1109/MWSYM.2000.862332
(Accessed September 17, 2021)