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Comparison between two optimization algorithms to compute the complex permittivity of dielectric multilayer structures using a free space quasi-optical method in 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: 13-21 Publication Date: Jan. 2009
Abstract: This paper describes two optimization algorithms used to calculate the complex permittivity and the
thickness of individual dielectric layers of multilayered structure in the W-band. The algorithms are the
genetic algorithm (GA) and the sequential quadratic programming (SQP) based on the quasi-Newton
method BFGS (BFGS-SQP) the setup procedure of both algorithms is presented. A quasi-optical free
space measurement system is used to measure the reflection and the transmission coefficients. The
performance of the measurement setup is first tested using different single layer slabs. A detailed
comparison between the two algorithms is reported. External Link.
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