Title :
A robust optimization algorithm for the reconstruction of dielectric properties of lossy composite materials
Author :
Akhtar, M.J. ; Feher, L. ; Thumm, M.
Author_Institution :
Inst. fuer Hochleistungsimpuls- und Mikrowellentech., Forschungszentrum Karlsruhe GmbH, Germany
fDate :
27 Sept.-1 Oct. 2004
Abstract :
A novel optimization algorithm is presented to determine the relative permittivity and conductivity of composite materials from the measurement of reflection and transmission data. The reflection and transmission coefficients of the material-under-test (MUT) are measured with the help of a vector network analyzer, by placing the MUT precisely into a section of WR-340 waveguide. The reconstruction of the dielectric properties is achieved by computing the scattering parameters of the MUT with the help of a transmission line approach, and then minimizing the error between the computed and the measured scattering data using the proposed algorithm.
Keywords :
S-parameters; carbon fibre reinforced plastics; composite materials; dielectric losses; dielectric materials; materials testing; network analysers; optimisation; permittivity; transmission line theory; C; WR-340 waveguide; dielectric properties; lossy composite materials; reflection measurement; relative conductivity; relative permittivity; robust optimization algorithm; scattering parameters; transmission coefficients; transmission data method; vector network analyzer; Composite materials; Dielectric losses; Dielectric materials; Dielectric measurements; Electromagnetic waveguides; Frequency measurement; Permittivity measurement; Reflection; Robustness; Transmission line matrix methods;
Conference_Titel :
Infrared and Millimeter Waves, 2004 and 12th International Conference on Terahertz Electronics, 2004. Conference Digest of the 2004 Joint 29th International Conference on
Print_ISBN :
0-7803-8490-3
DOI :
10.1109/ICIMW.2004.1422124
