Elena Semouchkina

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Elena Semouchkina, Douglas H. Werner, George B. Semouchkin, and Carlo Pantano Department of Electrical and Computer Engineering, Michigan Technological University, Houghton, Michigan 49931, USA Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA Department of Electrical Engineering, The Pennsylvania(More)
The geometric optics principles are used to develop a unidirectional transmission cloak for hiding objects with dimensions substantially exceeding the incident radiation wavelengths. Invisibility of both the object and the cloak is achieved without metamaterials, so that significant widths of the cloaking bands are provided. For the preservation of wave(More)
We reveal that the resonant Mie scattering by high-index dielectric nanoparticles can be presented through cascades of Fano resonances. We employ the exact solution of Maxwell's equations and demonstrate that the Lorenz-Mie coefficients of the Mie problem can be expressed generically as infinite series of Fano functions as they describe interference between(More)
A study of urban channel characteristics is carried out using the shooting and bouncing ray technique. Propagation characteristics are generated from the simulation, and are compared to measurement results for the downtown area of Austin, TX, at 1.9 GHz. Antenna dï ersity studies are also carried out using the simulation. Q 2000 John<lb>Wiley & Sons, Inc.(More)
An approach for designing transmission cloaks by using ordinary dielectrics instead of metaand plasmonic materials is proposed and demonstrated by the development of a multi-layer cloak for hiding cylindrical objects larger than the wavelengths of incident radiation. The parameters of the cloak layers were found by using the Genetic Algorithm-based(More)
At high magnetic fields radiation losses, wavelength effects, self-resonance, and the high resistance of typical components all contribute to increased losses in conventional RF coil designs. High permittivity ceramic dielectric resonators create strong uniform magnetic fields in a compact structure at high frequencies and can potentially solve some of the(More)
This paper shows how the dielectric constant of alumina and rutile substrates at microwa e frequencies can be accurately determined by fitting the simulated S-parameter spectra of microstrip ring ( ) resonators, generated ia the finite-difference time-domain FDTD method, to experimentally measured data. The proposed method does not require the determination(More)
Two different types of source excitation for finite-difference ( ) time-domain FDTD simulations, i.e., electric and magnetic field types, are in ̈estigated in this work for configurations that ha ̈e no ground planes. This paper shows that the electric field excitation introduces errors in the computed admittance of the de ̈ice due to the frequency(More)
A new sensing approach utilizing Mie resonances in metamaterial arrays composed of dielectric resonators is proposed. These arrays were found to exhibit specific, extremely high-Q factor (up to 15,000) resonances at frequencies corresponding to the lower edge of the array second transmission band. The observed resonances possessed with features typical for(More)