Ozturk, TurgutElhawil, AmnaUluer, IhsanGuneser, Muhammet Tahir2024-09-292024-09-2920170957-45221573-482Xhttps://doi.org/10.1007/s10854-017-6953-zhttps://hdl.handle.net/20.500.14619/3975This paper is a comprehensive study on Newton-Raphson technique used in millimeter wave frequencies for material characterization. Various algorithms are used for extracting the complex permittivity of a material from measured S-parameters. Efficiency of the methods depends on the initial guess and the accuracy of measured S-parameters for each thickness and frequency band. In this paper, we suggest the initial-value estimation method that helps to estimate a proper value for starting the algorithm. Moreover, an alternative extraction process is modelled that does not require new measured S-parameters or extracting process for each frequency band and thickness with a composed database. The estimation process is conducted partially as V (50-75 GHz), W (75-110 GHz), and D (110-170 GHz) frequency bands.eninfo:eu-repo/semantics/closedAccessBee Colony AlgorithmComplex PermittivityModelArticle10.1007/s10854-017-6953-z2-s2.0-850184683491154915Q21154328WOS:000405101700099Q2