Title :
Modified NRW algorithm for unmatched cell
Author :
Silva, Leonardo B M ; Santos, Edval J P
Author_Institution :
Electron. & Syst. Dept., Univ. Fed. de Pernambuco, Recife, Brazil
Abstract :
A method for determining the complex permittivity and permeability of liquids in a unmatched coaxial cell is presented. This approach is an extension of the well known Nicolson-Ross-Weir (NRW) algorithm. A g-factor is introduced in the reflection coefficient to account for the cell impedance mismatch. Its value can be calculated from theory and adjusted by calibration. The focus of this work is to characterize liquids using transmission/reflection method, hence a broadband coaxial cell was development to operate in the 300 kHz to 3 GHz frequency range. Experimental results are presented to demonstrate the method with several liquid materials of known permittivity.
Keywords :
permeability; permittivity; permittivity measurement; NRW algorithm; Nicolson-Ross-Weir algorithm; cell impedance mismatch; complex permittivity; frequency 300 kHz to 3 GHz; g-factor; liquid permeability; transmission-reflection method; unmatched coaxial cell; Calibration; Coaxial components; Connectors; Dielectric materials; Liquids; Permeability; Permittivity; Reflection; Scattering parameters; Wire;
Conference_Titel :
Microwave and Optoelectronics Conference (IMOC), 2009 SBMO/IEEE MTT-S International
Conference_Location :
Belem
Print_ISBN :
978-1-4244-5356-6
Electronic_ISBN :
1679-4389
DOI :
10.1109/IMOC.2009.5427613
