Modeling of Dispersive Materials Using Dispersion Models for FDTD Application |
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Authors: | Rakibul Hasan Sagor Kh Arif Shahriar Md Ghulam Saber Md Mahamudun Arif Joy Ikramul Hasan Sohel |
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Affiliation: | 1.Department of Electrical and Electronic Engineering,Islamic University of Technology (IUT),Gazipur,Bangladesh;2.Department of Electrical and Electronic Engineering,Northern University Bangladesh (NUB),Dhaka,Bangladesh;3.Department of Electrical and Electronics Engineering,Bangladesh University of Business and Technology (BUBT),Dhaka,Bangladesh |
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Abstract: | A nonlinear optimization algorithm based on the Nelder Mead method is used to characterize the frequency dependent permittivity of 15 materials based on Lorentz, modified Lorentz, Drude and Lorentz-Drude models. The optimized model parameters are used to calculate the complex relative permittivity of each material and compare it with experimental data. In each case, a very good match is found between the optimized and experimental data over a long wavelength range. Comparative study of the models used for each material is performed based on accuracy, wavelength range of applicability and computational efficiency. The parameters presented can be used for computer simulation of electromagnetic wave phenomena involving these materials. |
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