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Reliable Method for Material Characterisation using a Quasi-Optical Free-Space Measurement in the W-Band This publication appears in: IET Science, Measurement & Technology Authors: A. Elhawil, G. Koers, L. Zhang, J. Stiens and R. Vounckx Volume: 3 Issue: 1 Pages: 39-50 Publication Date: Jan. 2009
Abstract: This paper presents an extension to Nicolson, Ross and Weir (NRW) algorithm to retrieve the complex
permittivity and permeability from both the reflection and transmission coefficients. This new numerical
retrieval approach solves the phase ambiguity problem associated with the NRW algorithm. A free-space
quasi-optical 2-port measurement setup is employed to obtain the scattering parameters of different
samples in the W-band frequency range. The results of different samples with various thicknesses are
presented. Advantages and limitations of the method are also discussed. External Link.
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