P. N. Melezhik

Bio: P. N. Melezhik is an academic researcher from National Academy of Sciences of Ukraine. The author has contributed to research in topics: Diffraction & Grating. The author has an hindex of 7, co-authored 69 publications receiving 219 citations. Previous affiliations of P. N. Melezhik include National Academy of Sciences & Russian Academy of Sciences.

Surface resonances of metal stripe grating on the plane boundary of metamaterial

Abstract: The paper is devoted to the study of the interaction of the electromagnetic waves with the structure composed of perfectly conducting strip grating, situated on the plane boundary of metamaterial with effective permittivity, depending on the frequency of the wave of excitation. The rigorous solution to the relevant diffraction boundary value problem is developed. The extensive numerical experiments, performed with a help of corresponding algorithm constructed, allowed to establish several regularities in the complicated process of interaction of electromagnetic waves with grating on dispersive metamaterial. The efficient association of analytical and numerical study has provided the understanding of the nature of resonant phenomena appearing in this process.

An open resonator for physical studies

Abstract: The excitation efficency of the TEM01q oscillation of an two-mirror hemispherical open resonator (OR) is studied. The resonator is excited by the TE01 wave of a circular waveguide joined in the middle of the OR plane mirror. Given the waveguide optimum size, the TEM01q mode excitation efficiency reaches 78%. Analysis of the resonant system spectrum in the 4-mm wave region shows that this waveguide-OR system offers a single mode resonance curve across almost a 10-GHz tuning range. The TEM0110 mode field distribution with and without the circular waveguide in the middle of the OR plane mirror is available due to the small scatterer method. It is shown that the considered open system is suitable for measuring electromagnetic characteristics of high-loss substances and metamaterials in the short-wave end of the millimeter (mm) region as well as in the submillimeter (submm) wave region.

Radiation from surface with periodic boundary of metamaterials excited by a current

Abstract: The rigorous modeling and analysis of electromagnetic wave transformation and radiation from the periodic boundary of metamaterial are presented. The nature of the phenomenon of resonant radiation and the influence of various parameters on it are investigated. The study is carried out with the objective of potential applications to antenna design. Simulated results show that very high directivity can be obtained and that beam steering can be achieved by adjusting proper parameters.

Absorbing properties of a negative permittivity layer placed on a reflecting grating

Abstract: Theoretical results on the electromagnetic properties of such a structure as a negative-permittivity layer placed on a reflecting grating are discussed. Effect of this structure resonant absorption of the excitation electromagnetic energy is studied in a wide range of problem parameters. The sufficient conditions of the effect appearance are determined by solving the dielectric-layer eigenoscillation problem. A comparative analysis of the absorption by the negative- and the positive-permittivity structures is made to reveal the characteristic features of the effect. Phenomenon of the absorption resonance splitting is shown in the case of plane wave oblique incidence on the structure. The E-polarized plane wave diffraction is considered to find out essential difference of the resonant absorption in the E and H cases.

Planar antenna with diffraction radiation for radar complex of millimeter band

Abstract: Design principles of diffraction-type planar antennas which can be successfully used for building antennas systems with required parameters including formation of radiation pattern (RP) with special shape are presented. All main characteristics of the studied planar antenna with open electro-dynamic structure of millimeter band on the example of antenna system used in the modern radar complex are obtained.

The method of analytical regularization in wave-scattering and eigenvalue problems: foundations and review of solutions

Abstract: We discuss the foundations and state-of-the-art of the method of analytical regularization (MAR) (also called the semi-inversion method). This is a collective name for a family of methods based on conversion of a first-kind or strongly-singular second-kind integral equation to a second-kind integral equation with a smoother kernel, to ensure point-wise convergence of the usual discretization schemes. This is done using analytical inversion of a singular part of the original equation; discretization and semi-inversion can be combined in one operation. Numerous problems being solved today with this approach are reviewed, although in some of them, MAR comes in disguise.

Research Progress in Reversed Cherenkov Radiation in Double-Negative Metamaterials

Abstract: We review the research progress in reversed Cherenkov radiation in double-negative metamaterials (DNMs) starting from the first experimental verification of the DNMs reported in 2001, including theories, numerical computation and simulation and experiments. We also discuss the potential applications to particle detectors and highpower microwave or millimeter-wave devices, including the oscillators and amplifiers, and the formidable challenges needed to be resolved before the benefits of using such artificial materials can be harvested. Corresponding author: Z. Y. Duan (zhyduan@uestc.edu.cn).

Fundamental modal phenomena on isotropic and anisotropic planar slab dielectric waveguides

Abstract: The characteristic interactions of discrete modes supported by planar isotropic and anisotropic dielectric slab waveguides are analyzed using singularity and critical point theory, leading to a rigorous and complete explanation of all modal interactions Complex frequency-plane singularities associated with modes on isotropic waveguides are identified and discussed, and the absence of mode coupling is proven For an anisotropic planar waveguide having an arbitrarily oriented optical axis, it is shown that mode coupling is controlled by the presence of an isolated Morse critical point (MCP) accompanied by a pair of complex-conjugate frequency-plane branch points The interaction of space-wave leaky modes on a grounded anisotropic slab is studied by investigating the evolution of complex frequency-plane branch point singularities as the orientation of the optical axis varies The general theory is presented, and numerical results are provided for some specific waveguides

Factors Affecting the Performance of the Radar Absorbant Textile Materials of Different Types and Structus

Abstract: In the military applications, electro-optics and electromagnetics features of the cloths made of special textile structures and certain fibers play an important role in producing textile characterized with high ability of camouflage. This means not allowing enemy to precisely determine the moving and mute targets using available radar or any other electro-optics sensors. The aim of this paper is to determine the effect of the composite fabrics structure parameters on the fabrication of a resistive sheet used in many radar applications. The objective sheet can be used as a lossy sheet in absorbing mechanism. The radar absorbing mechanism has been studied with emphasis on the single layer structure mechanism with a resistive sheet. Fabric structure of the resistive sheet was accurately chosen and coated