Modelling of isotropic double negative media for microwave applications |
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Authors: | I Vendik O Vendik I Kolmakov M Odit |
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Institution: | (1) Microwave Microelectronics Laboratory, Dept. of Microelectronics & Radio Engineering, St.-Petersburg Electrotechnical University, 5 Prof. Popov Str., 197376 St.-Petersburg, Russia |
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Abstract: | A composite medium consisting of two sublattices of dielectric spherical particles of high permittivity and different radii
embedded in a dielectric matrix of smaller permittivity are considered. It has been shown that such a composite medium reveals
properties of an isotropic double negative media (DNG) in a limited frequency range, when resonance oscillations of HIII mode in one kind of particles and EIII mode in another kind of particles are excited simultaneously. The EIII resonance and the HIII resonance give rise to the magnetic dipole momentum and the electric dipole momentum correspondingly. Averaging the magnetic
momentum and the electric momentum over the cells belonging to the appropriate spherical particles gives the negative permittivity
and permeability. The model of diffraction of a plane electromagnetic wave on a dielectric sphere is presented and compared
with the mixing rule based consideration. The results obtained are rather close. Distribution of the electromagnetic wave
outside the sphere is calculated. Influence of the dispersion of the sphere size and the dielectric permittivity on the effective
parameters of the DNG material is estimated. |
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Keywords: | composite medium double negative metamaterial spherical particle mixing rule diffraction isotropic |
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