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A multi-layer transmission cloak formed from ordinary dielectrics for hiding cylindrical objects with diameters exceeding incident wavelengths is developed. The Helmholtz equation solution and the Genetic Algorithm have been used to find the optimal dielectric constants and thicknesses of the cloak layers. Full-wave simulations have demonstrated that the designed cloak can provide efficient wave front...
Ultrafine tetragonal BaTiO3 nanocrystals have been prepared by a sol–gel based method. By adjusting the volume ratio of H2O/DEG (diethylene glycol) in the solutions, hydrolysis rate of tetra-n-butyl titanate was strongly inhibited and the particle size could be controlled as small as 4–8 nm. The powder X-ray diffraction and transmission electron microscopy characterizations exhibit that the nanocrystals...
Electromagnetic responses of linear arrays of cylindrical dielectric resonators, which are building blocks of metamaterials, are investigated by full-wave simulations and measurements in a standard waveguide in the microwave range. It is demonstrated that electromagnetic interaction between ceramic resonators fabricated of the material with the relative permittivity of ∼37 can cause the resonance...
We present a cylindrical electromagnetic cloak composed of identical ceramic dielectric resonators for operation in the microwave range. The performance of the cloak has been verified by full-wave simulations of the true multi-resonator cloak structure and by the measurements of the integral transmission through the fabricated prototype. It is demonstrated that due to inter-resonator coupling the...
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