caa a22 4500 445305177 CHVBK 20180317142610.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10762-011-9792-7 doi (NATIONALLICENCE)springer-10.1007/s10762-011-9792-7 Resolving Phase Ambiguity in the Inverse Problem of Transmission /Reflection Measurement Methods [Elektronische Daten] [Joaquim Barroso, Ugur Hasar] Inherent to transmission/reflection measurement methods and posed by the multiple-valued logarithm function of the complex transmission coefficient, the phase ambiguity problem is solved by the phase wrapping technique. Here extended and generalized, the proposed technique relies on properly adding to the phase of the complex logarithmic function a stepwise function built in from the resonance frequencies at which the phase of the transmission coefficient reaches ±π. In a concrete example the method is illustrated by correctly retrieving from complex scattering parameters the constitutive parameters of a highly-dispersive medium (distilled water) over the 0-250GHz frequency range. Implication of a mathematically negative wavelength is also discussed. Springer Science+Business Media, LLC, 2011 Constitutive material parameters nationallicence Transmission/reflection measurement methods nationallicence Scattering parameters nationallicence Phase ambiguity nationallicence Transmission coefficient nationallicence Barroso Joaquim Associated Plasma Laboratory, National Institute for Space Research, 12227-010, São José dos Campos, SP, Brazil aut Hasar Ugur Department of Electrical and Electronic Engineering, Ataturk University, Erzurum, Turkey aut Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/6(2011-06-01), 857-866 1866-6892 32:6<857 2011 32 10762 https://doi.org/10.1007/s10762-011-9792-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10762-011-9792-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Barroso Joaquim Associated Plasma Laboratory, National Institute for Space Research, 12227-010, São José dos Campos, SP, Brazil aut NATIONALLICENCE 700 1- Hasar Ugur Department of Electrical and Electronic Engineering, Ataturk University, Erzurum, Turkey aut NATIONALLICENCE 773 0- Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/6(2011-06-01), 857-866 1866-6892 32:6<857 2011 32 10762 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer