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Parka, Janusz
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Publications (7/7 displayed)
- 2022Active control of dielectric singularities in indium-tin-oxides hyperbolic metamaterialscitations
- 2022Active control of dielectric singularities in indium-tin-oxides hyperbolic metamaterialscitations
- 2013Microwave complex permittivity of voltage-tunable nematic liquid crystals measured in high resistivity silicon transducerscitations
- 2013Dielectric properties of highly anisotropic nematic liquid crystals for tunable microwave componentscitations
- 2011Silver-Gelatine Metal-Dielectric Composites Made From Developed X-Ray Filmscitations
- 2011Experimental study of thermally controlled metamaterial containing a liquid crystal layer at microwave frequenciescitations
- 2007Measurements of anisotropic complex permittivity of liquid crystals at microwave frequenciescitations
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article
Silver-Gelatine Metal-Dielectric Composites Made From Developed X-Ray Films
Abstract
The artificial dielectric properties of developed silver-gelatine X-ray film have been evaluated at microwave frequencies. The density of the silver particles in the thin films on the surface of the plastic substrate determines the real and imaginary parts of the complex permittivity. The resulting metamaterial was evaluated between 5 and 20 GHz using the split-post dielectric resonator technique. The real part of the relative permittivity of silver-gelatine mixtures varies in the range 4-170 depending on the concentration of silver. The dielectric loss tangent for such materials is in the range 0.06-0.25 and is largest for the highest permittivity samples .