A.V. Bezougly and V.V. Khoroshun
Kharkov National University of Radio Engineering and Electronics,
14, Lenin Ave, Kharkov, 61166, Ukraine
Electromagnetic Wave Diffraction by a Grating of Gyrotropic Circular Cylinders

A rigorously formulated problem is analyzed of an E(H)-polarized wave obliquely incident on a planar grating of ferrite cylinders of circular cross-section, magnetized to saturation by an external homogeneous field oriented along the cylinders. Analytical expressions are derived for the reflection and transmission coefficients within the long-wave approximation. Numerical results are given, concerning the coefficient dependences upon the magnetizing field strength.

Back
K.M. Yemelyanov1 and A.G. Nerukh2
1V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077, Ukraine
2Kharkov National University of Radio Engineering and Electronics, 14, Lenin Ave, Kharkov, 61166, Ukraine
Irregular Scattering of Electromagnetic Signals in a Regular Time-Varying Medium

Discussed in the paper is the transformation of electromagnetic signals in a medium with time-variation of the dielectric constant and conductivity that can be modeled by a finite sequence of periodic rectangular pulses. As is shown, with certain relations between the medium parameters and characteristics of the signal the behavior of secondary waves may become irregular. The irregularity parameter is analyzed numerically.

Back
D.N. Goryushko and A.A. Shmat'ko
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077, Ukraine
Wave Packet Scattering by an Anisotropic Gyromagnetic Layer

The problem of wave beam scattering by an anisotropic ferrite layer is solved employing the spectral method. The object is a 2D beam obeying the Gaussian distribution in the cross section plane and having no variations in the direction perpendicular to the plane of incidence. Expressions for the reflection coefficient of the plane wave from the layer with a tensorial magnetic permeability have been obtained. Properties of the spatial distribution of the reflected field are analyzed for various angles of beam incidence.

Back
V.V. Scherbak
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkov 61085, Ukraine
Mutual Wave Conversion under Resonant Scattering by Two and More Diaphragms in a Rectangular Waveguide

Resonant mutual wave conversion on multistrip diaphragm cascades have been analyzed. Nontrivial situations of the optimum wave interaction and suppression of undesirable mode coupling have been found. In working multiparametric optimization problems, the algorithms used are supplemented with the regularization procedures.

Back
I.Yu. Vorgul
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077, Ukraine
Field Interaction with Inhomogeneous Non-Stationary Planer Structures of Finite Size: Solution of Inverse Problems

The interaction of electromagnetic fields with a non-stationary, uniaxially-inhomogeneous conducting medium is analyzed. A new technique is suggested for treating one-dimensional inverse problems for media of this kind. An algorithm has been developed for solving the non-stationary inverse problems to recovery space-and-time dependences of conductivity of the 1D media from known reflected and incident fields. The algorithm's potential, as applied to diagnostics and synthesis of planar non-stationary structures is illustrated by numerical examples.

Back
L.M. Karpukov
Zaporozhye National Technical University,
64, Zhukovskogo St., Zaporozhye, 69063, Ukraine
Algorithm of Modeling the Green's Functions of Multilayered Dielectric Structures

An algorithm of derivation of numerical-symbolic expressions for computing the Green's functions of multilayered dielectric structures in the boundary-value problems of electrostatics is considered. The algorithm is based on the suggested formulas for determining the transfer functions of decomposition schemes that model the multilayered structures.

Back
N.N. Minervin and A.L. Kuznetsov
Kharkov Military University
 Algorithms Using a Coherent Pulse Packet:Estimation Accuracy and Measure of Resolution for a Carrier Frequency and Its Rate of Change

Algorithms, an estimation accuracy, and a measure of resolution both of a carrier frequency and of its rate of change are obtained in an explicit form with the use of a coherent pulse packet. The algorithms developed allow certain of their fundamental properties to be revealed. The formulas for a potential measurement accuracy and measures of resolution are derived.

Back
V.M. Yakovenko and I.V. Yakovenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkov 61085, Ukraine
 On Transition Radiation of Surface Polaritons by a Modulated Flow of Charged Particles

A mechanism of the interaction of a modulated flow of the charged particles with the surface waves in plasmalike media, superconductors and ideally conducting conductors with a periodically rough boundary have been investigated. Modulation frequency is designated by the surface wave frequency. It is found that the density of the energy flow of the surface wave undergoes oscillations depending on the relation between the period of Langmuir oscillations of the electron beam and the transit time of the particle from the modulation plane to the media interface. It is shown that the flow amount can considerably exceed that one for the surface waves excited by a charged strip.

Back
N.N. Beletskii and S.A. Borisenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkov 61085, Ukraine
 Determining the Antiferomagnetic Resonance Frequency in Semimagnetic Semiconductors by Means of Surface Polaritons

In the articles surface polaritons are investigated in semimagnetic semiconductors which are in a phase of antiferromagnetic ordering. The influence of the external static magnetic field and the electron concentration on the dispersion properties of the surface polaritons is determined. It is shown that the surface polaritons can have the dispersion independent of the direction of their propagation in the Voigt geometry. A new method based on excitation of the surface polaritons in the semimagnetic semiconductors is proposed for determination of the antiferromagnetic resonance frequency.

Back
N.A. Balakhonova and A.V. Kats1
Kharkov Military University
6, Svoboda Sq., Kharkov, 61005, Ukraine
1A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkov 61085, Ukraine
Solitary Resonance in the Diffraction on Impedance Gratings

A detailed analytical treatment and numerical analysis of the resonance diffraction of a plane monochromatic wave on gratings formed by modulation of optical constants on the boundary of a highly reflecting medium are performed at an impedance approximation. Both Wood and Rayleigh-type anomalies in the intensities and phases of diffracted waves under the conditions of a solitary resonance are investigated. Specifically, the conditions under which the incident wave is transformed into the surface electromagnetic (EM) wave (EMW) and the specular reflection is totally suppressed. The relations of width, location and other parameters of resonance transformation to the optic constants of a medium and the grating parameters are derived. The obtained results suggest that using the Wood and Rayleigh anomalies hold a great deal of promise in terms of serving metrological purposes, thereby permitting the radiation and gratings' parameters as well as optical characteristics of a medium to be determined to a high degree of accuracy.

Back
B.A. Antonova, V.N. Borshchov, A.M. Listratenko, and N.I.Slipchenko
Kharkov National University of Radio Engineering and Electronics,
14, Lenin Ave, Kharkov, 61166, Ukraine
Constructive and Manufacturing Limitations of Microstrip Silicon
PIN Detectors of Radiation

The requirements are considered for design and manufacturing solutions of microstrip silicon detectors of ionizing radiation. The PIN receiver topology is suggested, allowing to develop the detector module based on aluminium microcables.

Back
V.I. Bulakh and N.I. Slipchenko
Kharkov National University of Radio Engineering and Electronics,
14, Lenin Ave, Kharkov, 61166, Ukraine
Analytic-Technological Probe Microscopy

Basic principles of the probe microscopy are discussed and classified. Area of the scanning probe microscope applications is defined for research in natural sciences and technology.

Back
V.V. Starostenko
Tavriya National University, Yaltinskaya 4, Simpheropol, 95022
 Impact of High-Power Pulse Fields on Biological Objects and Media

The position of high-power pulse electromagnetic fields among such external factors as electromagnetic fields is considered. The results concerning carbonate solubility in the water activated by the powerful pulse fields, the data on the influence of the food prepared with activated water on morphometric and reproductive characteristics of the fruit fly as well as the direct action of the pulse fields on the black-pine-leaf are presented.

Back