1. Multifunctional measuring platform for investigations parameters of metaldielectric structures V.A. Katrich, D.V. Mayboroda, S.A. Pogarsky, I.I. Saprykin Automation complex, dielectric image guide, energetic characteristics Vestnik KhNU ¹712 Pages. 2124
The multifunctional automation measuring platform for ultra high frequencies parameters definition has been de signed. The basis of this complex is the controlled mechanical platform which allows to measure the field amplitudes along two orthogonal coordinates. The processing of measuring date realizes with the help of special software. The measuring of energetic characteristics of radiating module based on dielectric image guide has been carried out
2. Radiation of electromagnetic waves by the system of transverse and longitudinal slots in the wide wall of rectangular waveguide S.L. Berdnik Antenna array, multifrequency antenna, slot system, multimode rectangular waveguide Vestnik KhNU ¹712 Pages. 2529
The problem of radiation of electromagnetic waves by the doublefrequency multielement slot array on a multimode waveguide was solved by the Galerkin's method. The radiating aperture is two systems of longitudinal and transverse slots in the wide wall of the rectangular waveguide. The power and directional characteristics of such structure were investigated. Thickness of the waveguide wall, interior and exterior interactions between slots were taken into account at calculations
3. Longitudinal slot radiators cut in circular waveguide E.Y. Belogurov, V.A. Katrich, V.A. Lyaschenko circular waveguide, Axial slot, electromagnetic waves, radiation, slot antennas Vestnik KhNU ¹712 Pages. 3741
Using method of magnetomotive forces investigations of behaviors of longitudinal slots that were cut in wall of the circular waveguide were carried out. Expressions of internal selfadmittance and transfer conductance were de rived. The possibility of creation of a tapered illumination that forms radiation pattern with low side lobes on long slot cut in circular waveguide was shown
4. Electromagnetic wave detraction on a resistive unclosed cone V.A. Doroshenko, O.G. Litvinova diffraction, resistive, longitudinal slots, An integral transform, Analytical solutions Vestnik KhNU ¹712 Pages. 9599
Problem of harmonic electromagnetic wave diffraction on a resistive cone with longitudinal slots is considered. The boundary problem solution uses the KontorovichLebedev integral transform and a semiinversion method. Analytical solutions are obtained for the cone with a lot of narrow slots and reactive impedance. Impedance and longitudinal slots effects on scattering field structure is studied
5. Same question of modeling of tunnel contact semiconductor structure O.V. Botsula, E.D. Prokhorov tunnel cathode, negative differential conductivity, contacts, current  voltage characteristics, cathode, Anode Vestnik KhNU ¹712 Pages. 119122
Electronic processes are considered at course of a current through semiconductor structure with the tunnel cathode. The approach to modelling the structures including as a component tunnel geterojunction is offered. Static characteristics of structures to a basis geterojunction GaAs/AIGaAs received with application of the offered technique are resulted
6. Stimulation of the size evolution of the gas includes in a liquid by electromagnetic waves B.G. Yemets electromagnetic waves, Air bubbles in liquid, temperature field, convection Vestnik KhNU ¹712 Pages. 127131
Based on the model considerations it was shown that irradiation of liquids containing gas inclusions with electromagnetic fields of "slowlyconvective" intensity is conducive to the changes in the inclusion size
7. On the field fluctuations in the diffraction pattern of focusing systems Ya.S. Shifrin fluctuations, Amplitude, phase, focal plane Vestnik KhNU ¹756 Pages. 510
There are considered the amplitude and phase fluctuations of the field in the focal plane of the focusing system, when a was with the field fluctuations falls on it. Plots illustrating the distribution of dispersions of amplitude and phase of the field along coordinate axes in the focal plane are given. There are analyzed a general case when both the amplitude and phase fluctuation of the field are present in the incident wave, as well as cases when it is possible to be restricted by regard of only either the phase or the amplitude fluctuations of the field in the antenna aperture. It is shown that in the latter cases, for determination of dispersions of the phase and amplitude fluctuation of die field in the focal plane, it is possible to use the same pictures with tk corresponding replacement of curves and conclusions accompanying them.
8. Radioacoustic wind sounding of the atmosphere bo un dat y layer: history of the development and perspectives Y. N. Ulyanov, V. I. Vetrov, N. G. Maksimova radioacoustic, wind, sounding, Atmosphere, boundary layer, profile, Adaptation Vestnik KhNU ¹756 Pages. 2732
The article is devoted to the potentialities of the method of radioacoustic sounding when monitoring the vertical structure of the wind in the atmosphere boundary layer (ABL). A review of methods for radioacoustic measurements of the horizontal wind velocity and direction is based on the developments of the authors and their experience in this field as well as on the world experience. It is emphasized that the radioacoustic method for sounding the wind in ABL is perspective, since for the RAS equipment, there are not characteristic neither high levels of the electromagnetic pollution of the environment like for radiolocation wind profilers  radars nor loss of the serviceability at ligh levels of the ambient acoustic noise like for acoustic wind profilers  sodars.
9. ELECTROMAGNETIC WAVE SCATTERING FROM ANISOTROPIC INCLUSION IN RECTANGULAR SHORTCIRCUIT WAVEGUIDE N.P. Zhuck, V.I. Fesenko, S.N. Shulga, O.V. Bagatskaya, He Shi scattering matrix, rectangular waveguide, Anisotropic medium Vestnik KhNU ¹756 Pages. 3337
The problem of determination of the scattering matrix coefficients from anisotropic inclusion in one side shortcircuit waveguide was considered. Calculation of the scattering matrix coefficient S_{10} for the anisotropic slab in the end of the empty rectangular waveguide is presented
10. EXCITATION OF AN UNCLOSED CONE PLACED AT AN IMPEDANCE PLANE V.A. Doroshenko, O.G. Litvinova, A.V. Sova excitation, An impedance plane, cone, longitudinal slots, Analytical solutions Vestnik KhNU ¹756 Pages. 4246
By using the approach that is based on applying the Kontorovichlebedev integral transforms method and a semiinversion method an excitation boundary problem for a cone with periodical longitudinal slots provided that cone placed at an impedance plane is investigated. It is showed that the problem under consideration is equivalent to solving a system of linear algebraic equations for Fourier coefficients of electromagnetic field components. Analytical solutions are obtained for a semi transparent cone and special plane impedance. Impedance plane effects are studied
11. INFLUENCE of ENVIRONMENT ON the FIELD, SCATTERING ON the LATTICE WITH LAYER, AT ANY FALL of the WAVE A.I. Adonina, V.B. Khokh lattice, environment, dielectric, A stream of capacity, method of RimanHilbert problem Vestnik KhNU ¹756 Pages. 5156
The decision of a task in view is carried out for Å and Í the fields appropriate to two subsystems on which the system of the equations of the Maxwell for environments is divided. Integrated characteristics of a field are determined from the decision of systems of the linear algebraic equations received by a method of method of RimanHilbert problem , for a case when the smallest parameter decreases in inverse proportion to a square n>infinity. Programs (fort) with construction of diagrams are made. The analysis of the diagrams in part given in work, allows to establish influence of parameters of structure and corners of fall of a wave on anomalies in an absentminded field for each concrete case
12. The analytical method for a periodical sequence of the alternate grates of dielectric bars investigate V.B. Kazanskiy thick grate of dielectric bars, Anisotropic layer, periodic structure, propagation constant, scattering coefficients Vestnik KhNU ¹756 Pages. 7982
The electromagnetic properties of a finite periodic sequence of the thick grates of dielectric bars are investigated. The grates are identified with the homogeneous anisotropic layer of an appropriate thickness, in order to generalize, the layers which anisotropic properties of both permittivity and permeability are employed. The sequence scattering .coefficients are determined in analytical form using the circuit theory and the matrix functions techniques. Physical analysis of the frequency, angle and interference dependencies of the scattered field amplitude is carried out.
13. The Gaussian beam scattering on the bounded sequence of alternate grates of dielectric bars V.B. Kazanskiy, V.R. Tuz, D.V. Yudintsev Gaussian beam, thick grate of dielectric bars, Anisotropic layer, periodic structure Vestnik KhNU ¹756 Pages. 8386
The Gaussian beam scattering on bounded periodical sequence of thick grates of dielectric bars are investigated. Identification of discrete structure with appropriate thickness homogeneous anisotropic layer was carried out for define sequence basic element transmission matrix. The sequence scattering coefficients were written down via Mougin polynomials. The effects of form distortion, beam splitting into several beams, side shift of beam axe were shown. Their correlation with scattering coefficients phase and module angle dependence of separate grates was established.
14. GAUSSIAN EXPANSIONS FOR RADIATION PATTERN OF AN OPENENDED LINE WITH IMPEDANCE BORDERS A.P. Udovenko Aperture distribution, impedance border, orthogonal functions, diffraction integral, feed Vestnik KhNU ¹756 Pages. 8790
Nearfield and farfield twoparameter expansions in terms of LaguerreGaussian orthogonal basis functions are proposed, which take into account the effect of impedance feed borders. The expansions enable the feed characteristics on a base of lines with impedance borders to be calculated in wide frequency region. Radiation intensity distributions for the openended twolayer metalshielded dielectric waveguide in a nonresonance regions of surface impedance varying, relative errors of expansion truncations, comparison with experimental data are presented
15. SPECKLE – INTERFEROMETRICIAN METHOD FOR ANEMOMETRICIAN OF TURBULENT STREAMS G.N. Dolya, À.N. Katunin, Ê.V. Sadovy, S.I. Shmatkov , speckle – interferometrician, Anemometrician, speckle – painting, lightreflecting coverage Vestnik KhNU ¹756 Pages. 118122
In this paper is researched the possibility of the use of the modified speckle – interferometrician method for anemometrician of turbulent streams. It is developed laser anemometer on the basis of the modified speckle – interferometrician method at the applications of lightreflecting coverage. Is dependence of increase of border frequency of signal’s spectrum at growth of speed of stream transversal to the ray. Dependence of spectrum of fluctuations the adopted signal on the degree of the brought distortions in at a different temperature of turbulent stream is explored
16. SELECTIVE excitation of the HIGHorder MODES IN THE waveguide quasioptical RESONATOR A.V. Volodenko, O.V. Gurin, A.V. Degtyarev, V.A. Maslov, V.A. Svich, A.N. Topkov waveguide quasioptical resonator, excitation of the highorder transverse modes, An amplitude filter, Fourier optics Vestnik KhNU ¹756 Pages. 123131
The method of the space Fourierfiltration for selective excitation of separated highorder transverse modes in the waveguide quasioptical resonator with a high discrimination degree of undesirable modes is proposed and realized. It is carried out numerical study of characteristics of some the lowest on loss transverse modes of the dielectric and metal resonators of the submillimeter laser from geometric sizes of reflectors and parameters of the space filter on the nonuniform mirror. Configurations of the amplitudestepped mirrors for shaping the highorder transverse modes in the laser resonators containing waveguides and open parts are proposed
17. CALCULATION and EXPERIMENTAL MEASUREMENT OF ANODE BLOCKS PARAMETERS OF MAGNETRONS K.M. Basrawi, G.I. Churyumov magnetron, Anode block, Q quality factor, loaded Q factor, equivalent capacity, mode Vestnik KhNU ¹756 Pages. 132138
In this paper the outcomes of calculation and experimental measurements of cold parameters of the pulse and continuous X  range magnetrons are presented. The measuring and calculation techniques of equivalent capacities of the anode blocks of the magnetrons as well as Q quality factor, loaded Q factor and external Q factors of the resonant system for main N/2  mode and nearest N/2 1 and N/2 2 modes is given
18. On the primary mechanism for microwave therapeutic effects arising during gamma ray pathology B. G. Yemets electromagnetic microwaves, gamma rays, Air bubbles, biologically active points Vestnik KhNU ¹756 Pages. 139143
The biologically active points (BAP) show an increase in size due to an increase in size of air bubbles at nearmembrane water layer in the biologically active point cells. The increase in the air bubble size is produced by sweeping the microwave frequency.
19. Directed and polarization characteristics of the aperture of the circular waveguide with impedance flange N.N. Gorobets, V.M. Dakhov, I.V. Gorbach microwave, Antennas, waveguides, polarization, pattern Vestnik KhNU ¹806 Pages. 37
The amplitude and polarization patterns of the radiator in the form of the aperture of circular waveguide with impedance flange, excited by the dominant wave, have been measured by the method of the indicator antenna with polarization plane rotation. It is shown that such radiators have an axialsymmetric pattern, a wide polarization pattern and a low level of side lobes.
Download >>
20. Features of the forest radio emissi L.M. Atroshenko, K.P. Gaikovich, N.N. Gorobets, V.N. Gorobets radio emission, A forest Vestnik KhNU ¹806 Pages. 813
Dielectric permeability of sheet plates of deciduous breeds of trees, dependence of the level of own wood signal from its projective covering, temperature distinctions, diffraction of radiowaves and their plural reflections in a crone of trees are investigated.
Download >>
21. Arbitrary falling of wave on grate with by ànisotropic layer A.I.Adonina, R.R.Naumov, A.I.Sljusarev grate, magnetodielectric, stream of power, method of RimanGilbert, Anisotropic, resonator Vestnik KhNU ¹806 Pages. 2228
A decision set the problem is conducted for Å and Í pour, proper two subsystems into which the system of equalizations of Maxwell is divided for anisotropic environments. The mixed field (in the case of the arbitrary falling of wave) is determined as a sum of two types pour. Integral descriptions are from the decision of the reduced endless systems of linear algebraic equalizations, got the method of task of RimanGilbert. The analysis of the graphs, partly resulted in work, allows to set influencing of parameters of structure and angles of incidence of wave on an anomaly in the dissipated field for every concrete case, and also to suppose and to confirm physical reasons of existence of anomalies a numeral account, as resonances of own waves in the opened resonator which is design the explored structure.
Download >>
22. Way of transformation of the patterns of reception antennas A.A. Sorokin, A.F Sorokin, O.V. Sokolova, R.N. Zaluzhniy, N.N. Gorobets miñrowaves, Antennas, pattern, Frenel zones Vestnik KhNU ¹806 Pages. 2932
the expedient of management by the shape of directional diagrams with the help of a fragmentation of Frenel zones is offered. Measuring the shape of a pattern diagram of the horn and spiral antennas are carried out. Peak allocations a builder of a field in shortrange, medial and longrange bands for different frequency range are received and analyzed. By results of experiments intensity, a corner, radius for longrange and shortrange bands is constructed 3D images.
Download >>
23. Resonance phenomena occurring as a thin refractive cylinder diffracts the hertzian wave Yu. I. Grebenyuk, N. G. Kokodiy, Khe Shi diffraction, thin cylinder, refractive index, scattering, Absorption, weakening, resonance Vestnik KhNU ¹806 Pages. 3339
On the basis of solutions to the wave equation, the efficiency of dispersing, absorbing, and weakening the electromagnetic field that a thin cylinder with a large refractive index diffracts has been estimated. The transverse and longitudinal distribution of the electromagnetic field inside and outside of the cylinder has been calculated. The resonance is found to increase the intensity of both the electromagnetic wave field inside the cylinder and the scattered wave outside. Inside the cylinder at resonance, a wave propagating along its surface arises, and under some conditions, a wave propagating through the cylinder is also generated. As the refractive index is increased, the wave tracks the cylinder surface more closely, and its intensity is progressively enhanced.
Download >>
24. The influence of a dispersion and losses to the interaction of impulse signal with the model of the biological tissues O.N. Zheryobkina, O.V. Kazanskiy impulse signal, A biological tissue, time domain, flatlayer dielectric, dispersion Vestnik KhNU ¹806 Pages. 4043
In this paper the interaction of the impulse signal with biological tissues on an example of the flatlayer dielectric that models consecutive layers a skin, fat, muscle tissue is investigated. In this model, it is taken into account dispersion of the dielectric permeability and losses in a medium. The calculation program is received in result. It accounts the spacetime characteristics of the reflected and past signals for layers of the flatlayer dielectric with parameters of biological tissues. Influence of values of the dielectric permeability and angle of incidence on the characteristics of past and scattered signals also is considered.
Download >>
25. Selection of the highorder modes in the waveguide resonator by means a phaseshifting mirror A.V. Volodenko, O.V. Gurin, A.V. Degtyarev, V.A. Maslov, V.A. Svich, A.N. Topkov waveguide quasioptical resonator, excitation of the highorder transverse modes, A phase filter, Fourier optics, selection Vestnik KhNU ¹806 Pages. 8791
The method of the space Fourierfiltration for selective excitation of separated highorder modes in the metal waveguide quasioptical resonator with a high discrimination degree of undesirable modes is realized. It is carried out numerical study of characteristics of some the lowest on loss transverse modes for the metal resonators of the submillimeter laser from resonator geometric sizes and parameters of the phase filter on the nonuniform mirror. Configurations of the phaseshifting mirrors for shaping of the highorder transverse modes in the laser resonators containing waveguides and open parts are proposed
Download >>
26. Increase of free volume 0f the aip abundant in the water by the millimeter waves of low intensity B. G. Yemets electromagnetic waves, Air bubbles, field of temperature, convection Vestnik KhNU ¹806 Pages. 103106
Using an NMR technique the volume growth of the free ("bubble") air contained in water caused by lowintense electromagnetic waves is obtained. This change is caused by rectified diffusion of the dissolved air mass into bubbles. The increase in the free air may occure only under those conditions when there is no convection in the liquid, i. e. in the case of irradiating by means of lowintense waves.
Download >>
27. The exitation H_{p0} waveguide wave of the T–brunching with matching resonator V. N. Mizernik, A. A. Shmat'ko A branching of the waveguides, matching nouniformity, connection area, system of the linear algebraic equations Vestnik KhNU ¹834 Pages. 812
In strong electrodynamics statement the problem of excitation H_{p0} waveguide a wave by of the Tbranching with two types matching resonator is solved: otherworld and through passage. Results of calculation of amplitudefrequency characteristics of the module of factor of reflection for various parities between length of a wave and the geometrical sizes of structure are presented. Areas of value of parameters of the full coordination of wave guides are certain
Download >>
28. Radiolocation complex for extraatmospheric researches A.F. Sorokin, A.A. Sorokin, N.N. Gorobets, O.V. Sokolova radar, A, microwaves, space garbage Vestnik KhNU ¹834 Pages. 2530
The creation pulse radar is offered on the basis of radio engineering systems of the National centre of management and test of space means of Ukraine for the forecast asteroid of danger, cataloguing of space garbage, research of a solar crown, near a sun and interplanetary plasma, and also for radioastronomical researches of distant space. Is shown, that at use of largesized aerials to a ADU  1000 and P400 such radar at length of a wave ~ 30 cm at heights ~ 10^{5} ì finds out objects with the minimal sizes ~ 0,7 cm. On a disk of the Sun the spatial sanction ~ 10^{3} kms
Download >>
29. Earth profile plotting using pulse radar with scanning antenna array A. S. Kutsenko, Î. V. Kazansky, N. N. Kolchigin pulse radar, Antenna array, radar image Vestnik KhNU ¹834 Pages. 3741
This paper is devoted to development of radar signal processing technique which allows one to reconstruct earth profile and reveal and identify manmadc objects which arc situated on underlaying surface. The technique of signal processing and image construction is based on measuring of directional characteristics of the scene being investigated. Modeling of radar activity has been performed; radar images of some simple scatterers have been obtained. Possibility of using the technique for scene profile reconstruction and revealing of manmade objects situated on it has been shown
Download >>
30. Structure and the contents of the hypertext databaseof problems of remote sounding of the ground from space L.M.Atroshenko, N.N.Gorobets, L.P.Safronova, S.A.Smirnov ðroblems of remote sensing, A database Vestnik KhNU ¹834 Pages. 4251
The principle of construction and filling of a hypertext database of problems of remote sensing of the Earth from Space including more 4000 problems RSE are described. The approach to an optimum choice of a sensor control is illustrated by the examples of use of active and passive sounding in a radiorange
Download >>
31. Farfield distance of waveguide radiators N.N. Gorobets, E.E. Ovsyannikova, A.V. Shishkova rectangular waveguide, microwaves, boundary of far zone, Amplitude, phase radiation characteristics Vestnik KhNU ¹834 Pages. 6876
On the basis of Hertz potentials in Kirchhoff approximation the amplitude and phase radiation characteristics of openended rectangular waveguide excited by TE_{10} dominant mode are investigated at arbitrary distance from radiating aperture. The estimation criteria of far zone boundary for small (in comparison with the wavelength) waveguide radiators are presented. For such small radiators, the classic formula for calculation of farfield distance cannot be applied. Under suggested criteria the investigation of radiation characteristics are carried out. For waveguides with the sizes less then the wavelength in the waveguide, the boundaries of farfield distance are defined
Download >>
32. Directivity characteristics of rarefied antenna arrays N.N. Gorobets, A.A. Bulgakova electromagnetic waves, Antennas, Antenna array, directivity characteristics Vestnik KhNU ¹834 Pages. 8994
The radiation pattern, directive gain and scattering coefficient of equivedistance linear array were calculated and their dependencies on the number of radiators and distances between them were analyzed. It is shown that for every number of radiators the optimal antenna length of L≈0,9(N1), allowing to obtain the maximum of directive gain, occurs. For greater antenna length or increase in operating frequency, directive gain varies according to oscillating dependencies. The greater number of radiators occurs, the greater difference of maximums and minimums occurs. For small number of radiators (N≤8), the directivity characteristics of the array is higher, then for continuous antennas of the same electrical length. For N≥16, their characteristics coincide
Download >>
33. Pulse water insonification for laboratory research of electromagnetic wave propagation and dispersion in randomly inhomogeneous media in order to meet the conditions close to working ones V.B. Yuferov, A.N. Ponomarev, E.V. Mufel, A.N. Ozerov, I.V. Buravilov, V.N. Ishenko electromagnetic wave propagation, inhomogeneous medium, Air bubbles in liquid, Acoustic pulse pneumatic radiator Vestnik KhNU ¹834 Pages. 114119
The efficiency of pulse water insonification by pneumatic radiator is shown. Such radiator enables the formation above the water surface of hydrometcors and aerosols with a desired concentration. It is necessary for laboratory research of fluctuation phenomena of the electromagnetic wave propagation in randomly inhomogeneous media. The use of pneumatic radiator makes possible lo remove salt from the solution. This enables a certain degree of control over liquid permittivity
Download >>
34. Oscillation efficiency of TED diodes on the basis of nitrides E. D. Prokhorov, O. V. Botsula, A. N. Zabazhan AlN, GaN, InNdiodes, drift speed, oscillation efficiency Vestnik KhNU ¹853 Pages. 1521
Oscillation efficiency of intervalley transfer electrons diodes on the basis of nitrides (InN, GaN, AlN) is considered. Electric fields at peak oscillation efficiency are determined. The results have been compared to results for GaAs. The account of floatable potential in connections InGaN improves their power characteristics in comparison with power characteristics of these connections without taking into account floatable potential, maximal efficiency In_{0.8 }Ga _{0.2N and In0.5Ga0.5N diodes to compare to InN diodes on 30 % is higher (22 % to compare to 16,43 %) but at more high tensions of an electric field. The maximal oscillation efficiency is observed at higher electric fields than GaAs ( from 250 êV/sm for InN to 1000 kV/sm for AlN)}
35. Inner partial mutual admittance of two overlopping longitudinal slots in a rectangular waveguide with dielectric layer parallel to narrow walls A.A.Lyakhovsky, L.P.Yatsuk, A.F.Lyakhovsky , layer, dielectric, slot, Admittance, scattering parameters Vestnik KhNU ¹853 Pages. 2227
The expression for the partial inner mutual admittance of two longitudinal slots overlapping along waveguide longitudinal axis is obtained. The slots are cut in a broad wall of a rectangular waveguide filled with threelayered dielectric. The excitation problem is solved with the modified eigen waves method. As eigen waves of the LE and LM modes are chosen. The field in the source region includes the potential functions as well. Dependences of inner mutual admittance and scattering parameters on distance between two slots and frequency are investigated. The system scattering parameters calculated are in a good agreement with experimental data
Download >>
36. Influence of apertureillumination law on nearfield characteristics of aperture antennas E.E. Ovsyannikova, A.V. Shishkova, N.N. Gorobets electromagnetic waves, reactive fields, Aperture radiators, Kirchhoff technique, nearfield, farfield, Amplitude distributions, phase characteristics, Amplitude characteristics, reactive radiation power Vestnik KhNU ¹853 Pages. 2836
On the basis of Hertz potentials the investigation of nearfield reactive region of square aperture antennas with various aperture illumination laws has been carried out. The influence of the field amplitude distribution law in the aperture on the extension of this region has been studied. The calculation and analysis of amplitude, phase and power radiation characteristics, including reactive radiation power density, at the different planes in nearfield region have been carried out. The analysis of the criteria for estimation of nearfield reactive region boundary has been carried out
Download >>
37. Single cone with longitudinal slots excitation by an impulse point source A.V. Artyukh, y.A. Doroshenko, Y.D. Shimuk impulse source, cone, longitudinal slots, Analytical solution, numerical solution Vestnik KhNU ¹853 Pages. 5156
In this work the excitation of a semiinfinite perfectly conducting cone with periodic longitudinal slots by an impulse radial source problem is investigated. The solution of the wellposed initialboundary problem is found using an analytically numerical method based upon Green function and MelerFock integral transforms applying. It is shown that the original electrodynamic problem is equivalent to the one of the Fredholm linear algebraic equations system of the second kind solving. Analytical view of the solution is derived and the graphs illustrating the field dependence on the aperture angle and angle slot width are presented
Download >>
38. Diffraction of the plane acoustic wave on the hard spherical segment, shielding of the ball Rezunenko V.A. Acoustics, spherical segment, shielding ball, resonance frequencies, Algebraic equations of the second kind Vestnik KhNU ¹853 Pages. 5763
A solution of the axisymmetrical problem of acoustics in strict formulation is built. The acoustic potential of the velocity of the plane wave, diffracted on the hard spherical circular segment, shielding of the ball is analyzed. The method of regularization of the paired summarized equations is used. The method of the integral transformations is applied. The principal part of the summarized equations is isolated and inverted. The effectively solvable system of the linear algebraic equations of the second kind with the compact operator in the Hilbert space l_{2} is obtained. Comparison with the known results and limited cases of the problem is given. The effectiveness of the constructed algorithm is confirmed. Some resonance frequencies and generalization of the task are examined
Download >>
39. Asymptotic method of the solution of diffraction problem on the convex impedance cylinder, excited by the string of the electric current V.I. Vyunnik, A.A, Zvyagintsev diffraction, Asymptotic method, interpolation, convex impedance cilinder Vestnik KhNU ¹853 Pages. 6470
In the work considered the problem of diffraction electromagnetic waves on the convex impedance cylinder exited by string of the electric current, located near to its surface. The method asymptotic theories of the diffraction, offered by Fok is used. Are received asymptotic interpolation formulas for calculation radar cross section of the system string the current  cylinder, for a case of circular and elliptic impedance cylinders. The received formulas are suitable for calculations both in shadow and in lighted areas. It is shown, that these formulas can be distributed on a case of the any convex impedance cylinder with variable curvature
Download >>
40. Analysis of impulse fields reflected from layered medium with losses using artificial neural network Shyrokorad D. V., Dumin O.M., Dumina O.O., Katrich V.O. time domain, Artificial neural network, impulse fields, layered medium Vestnik KhNU ¹883 Pages. 3540
The problem of determination of thickness a layer of layered medium by impulse irradiation is solved. The impulse fields reflected from the layered medium with electrical characteristics close to the characteristics of human skin are analyzed by artificia
Download >>
41. FREQUENCY MULTIPLICATION AT IMPUCT IONIZATION IN TRASFER ELECTRON DIODES ON BASIS AlN, InN E. D. Prokhorov, O.V. Botsula, I. A. Grishchenko AlN, GaN, InN diodes, frequency transformation factor , drift velocity, harmonics. Vestnik KhNU ¹883 Pages. 3034
Multiplication of frequency at impact ionization in intervalley transfer electron diodes on basis InN, AlN is considered. The current – voltage characteristics of intervalley transfer electron diodes have negative conductivity region and strong increasing
Download >>
42. Longitudinal slot in a rectangular waveguide with dielectric layer parallel to wide walls A.A.Liakhovskyi slot, microwaves, waveguide, dielectric, Admittance, scattering parameters. Vestnik KhNU ¹883 Pages. 5966
The longitudinal slot is cut in wide wall of rectangular waveguide with threelayer dielectric filling which parallel to wide wall is considered. The excitation problem is solved with modified eigen waves method. As eigen waves of the LM and LE modes ar
Download >>
43. ABOUT SPURIOUS RESONANCES IN PROBLEMS OF DIFRACTION WAVES ON WAVEGUIDE DISCONTINUITY Mizernik V.N., Shmat'ko A.A. spurious resonances, A branching of the waveguides, mathching uniformity, connection area, system of the linear algebraicequations Vestnik KhNU ¹883 Pages. 6772
In work it is shown, that the problem of existence of spurious resonances in problems of diffraction waveguide waves on various discontinue in waveguides is connected with incorrect representation of matrix elements of system of the linear algebraic equat
Download >>
44. The accumulation of gas in galactic objects Sorokin A.A., Sorokin A.F., Zaharova M., Sokolova O.V., Gorobets N.N. Astrophysics, galactic objects, the accumulation of gas Vestnik KhNU ¹883 Pages. 37
The mechanism of the accumulation of gas in the galactic objects submerged in the largescale magnetic field is examined. As a consequence of the diamagnetism of the plasma subsystem of object, the stopper geometry of magnetic field with the radial electr
Download >>
45. Own magnon polariton surface modes in the open passage resonator with gyromagnetic medium Mizernik V.N., Shmat'ko A.A. magnon polatiton oscillations, the ferrite resonator, A junction of waveguides, the through passage open resonator, wavegaide inhomogeneity, Area of connection, system of the linear algebraic equations. Vestnik KhNU ¹966 Pages. 3136
The problem about owen modes of the open reentrant resonator partially filled is theoretically solved by gyrotropic ferrite medium and existence magnon polatiton surface (ÌPS) mods with tall concentration of a field on boundary line of the ferrite resonator is established. The every possible combined regimes of existence of superficial and volumetric fashions are analysed, dependences of their resonant frequencies on material parameters of medium and geometrical sizes of the resonator and a ferrite layer are certain.
Download >>
46. Impedance characteristics of planar diodes with tunnel boundaries based on GaAs Prokhorov E.D., Botsula O.V., Klimenko O.A. : negative differential conductivity, tunnel boundary, A diode, the tunneling. Vestnik KhNU ¹966 Pages. 1318
The impedance characteristics of the diodes are consider, which negative differential conductivity (NDC) is arise under certain voltage, due to tunneling of electrons through the side faces of the diode, which can be used for generation, amplification and multiplication. Depending on the active and reactive components of impedance are determined of the diode with the tunnel boundaries for the real parameters of the diodes. It is shown that the limiting frequency of the diode NDC is in the terahertz range and depends on its parameters.
Download >>
47. Astrophysics, galactic objects, the accumulation of gas Vestnik KhNU ¹883 Pages. 37
The mechanism of the accumulation of gas in the galactic objects submerged in the largescale magnetic field is examined. As a consequence of the diamagnetism of the plasma subsystem of object, the stopper geometry of magnetic field with the radial electric field is formed. In this configuration, effective retention and the accumulation of the plasma, which revolves in the latticetype fields, occurs. Atoms are tightly connected on the effects of recharge with the ions, which provides their accumulation. The calculated distributions of molecular and atomic hydrogen in our Galaxy, whose the stopper geometry of its magnetic field is wellknown, are given. It is shown that this mechanism describes well the basic special features of gas subsystems
Download >>
48. AlN, GaN, InN diodes, frequency transformation factor , drift velocity, harmonics. Vestnik KhNU ¹883 Pages. 3034
Multiplication of frequency at impact ionization in intervalley transfer electron diodes on basis InN, AlN is considered. The current – voltage characteristics of intervalley transfer electron diodes have negative conductivity region and strong increasing current regions due to impact ionization that is nonlinearity and lead to transparent frequency. If impact ionization takes place, frequency transformation factor increases and reaches, for example, 40 % for second harmonic have being showed. The frequency transformation factor increases for second and third harmonic if first harmonic voltage amplitude is several threshold voltage if compare with frequency transformation factor for all nitride compounds.
Download >>
49. time domain, Artificial neural network, impulse fields, layered medium Vestnik KhNU ¹883 Pages. 3540
The problem of determination of thickness a layer of layered medium by impulse irradiation is solved. The impulse fields reflected from the layered medium with electrical characteristics close to the characteristics of human skin are analyzed by artificial neural network in time domain directly. The normal incidence of plane wave with Gaussian time form is considered. The reflected electromagnetic field is calculated by FDTD method. Initial data for the neural network analysis are the values of amplitude of electrical component of reflected field. As an example, the network is trained to determine the thickness of one of the layers of the medium. The stability of the determination in presence of interferences, experimental errors and instabilities of medium parameters is investigated.
Download >>
50. slot, microwaves, waveguide, dielectric, Admittance, scattering parameters Vestnik KhNU ¹883 Pages. 5966
The problem of a longitudinal slot radiation is cut in wide wall of rectangular waveguide with threelayer dielectric filling which parallel to wide wall of a waveguide was solved. The excitation problem is solved with modified eigen waves method. As eigen waves of the LM and LE modes are chosen. The field in the source region includes the potential functions as well. The scattering parameters and resonance properties of slot are investigated. The scattering parameters calculated are in a good agreement with experimental data.
Download >>
51. spurious resonance, A branching of the waveguides, matching uniformity, connection area, system of the linear algebraic equations. Vestnik KhNU ¹883 Pages. 6772
In work it is shown, that the problem of existence of spurious resonances in problems of diffraction waveguide waves on various discontinue in waveguides is connected with incorrect representation of matrix elements of system of the linear algebraic equations (SLAE) which lead to features at their numerical decision. On an example of a problem of diffraction waveguide waves on the Òbranching of rectangular wave guides it is shown, that spurious resonances correspond to resonances of area of connection of waveguides. This computing mistake can be rather simply corrected due to correct representation of matrix elements SLAE which has no features. Results of calculations have shown efficiency of such approach for the decision of problems on own oscillations and problems of diffraction on the Òbranching of hollow wave guides, and tees with dielectric and ferrite resonators in the field of connection of waveguides.
Download >>
52.
laser radiation, Acoustic emission, plasma, crater, A zone of nonelastic destruction, laserplasma evolution. Vestnik KhNU ¹983 Pages. 1117
Acoustic emission of a zone of the destruction formed during influence of pulse laser radiation on a surface of metal is considered. Dependence of the time form of acoustic fluctuations on parameters of an irradiated material and the law of increase in depth of a crater was estimated. It is revealed, that at action on a surface of the copper sample of a laser impulse duration 20 ms time of growth of a zone of destruction makes approximately 40 ?ñ, that will well be coordinated with time of existence of plasma formation at a surface of the target exposed to laserplasma processing (50 ms).
Download >>
53. Impact of random variations of air hole diameters and random variations of the centers position of air holes on operation parameters of a solid core microstructured optical fiber A.I. Filipenko, A.N. Donskov finiteelement method, Gaussian distribution, inclusions diameter, total mode field power, Angular positioning, microstructured optical fiber. Vestnik KhNU ¹983 Pages. 2932
We investigated the impact of random variations of air hole diameter and random variations of the centers position of air holes on operation parameters in the case of solid core microstructured optical fiber with a ring of air holes. The found results show that at any of considered defect types mode field will have two pronounced maximums. At practical use an investigated type of the MOF special angular positioning end faces of fibers is necessary. We also have shown that random variations of inclusions diameter can increase total mode field power. In our research we used finiteelement method.
Download >>
54.
Abnormally low reflection, metamaterials, Antireflection channels. Vestnik KhNU ¹983 Pages. 102106
The physical features analysis to describe formation the regions with extremely low reflection of electromagnetic radiation in the terahertz and far infrared ranges are presented and these regions should be observed in many experimental studies. It is shown that in case of sufficiently small damping of polar phonon the spectral bands with almost complete reflection disappearance (R <0.01%) are formed and we name these bands as antireflection channels (ARC). ARC located outside the region of negative dielectric permittivity, and the minimum reflection is shifted above the frequency of longitudinal oscillations by the value depends on the basic parameters of the polar vibrations.
Download >>
55.
Antenna array, horizontal polarization, double slots, slowing system. Vestnik KhNU ¹927 Pages. 5458
Energetic and directional characteristics of an antenna array (AA) with single transversal slots and double ones cut in a rectangular waveguide, partially filled with dielectric are investigated. In the case of single transversal slots and double transversal slots a dielectric layer is parallel to broad walls of the waveguide. It was shown the possibility to construct an AA with double transversal slots having the pattern without diffraction lobes and high level of radiation power in the wide frequency band.
Download >>
56.
slot, waveguide, dielectric, Admittance, scattering parameters, slotwaveguide array. Vestnik KhNU ¹927 Pages. 5964
The scattering problem of a longitudinal slot system is cut in wide wall of rectangular waveguide with threelayer dielectric filling which parallel to wide wall of a waveguide was solved. The scattering parameters and gain of linear slottedwaveguide array are investigated in range of frequency. The gain optimization and synthesis of linear slottedwaveguide array were carried out using a genetic algorithm. The obtained gain weakly depends from frequency.
Download >>
57.
polarization converter, Bragg reflector, Anisotropy Vestnik KhNU ¹927 Pages. 4347
Today, there are two fundamental type polarization converters, passive and active, are widely used in optical circuits. In this paper, we present a passive polarization converter for near infrared range. The converter reported here is porous siliconbased structure consists of N distributed Bragg reflectors (DBR) separated by N1 defects. The method of the electromagnetic field’s scalarization and finite difference technique were used for calculation of spectral characteristics. The transmittance spectra of the proposed polarization converters for the both polarization of the incident plane wave are presented
Download >>
58.
Gunn diode, dipole domain, Accumulation layers, transit frequency, efficiency generations Vestnik KhNU ¹927 Pages. 36
Results of research of power and frequency characteristics of Gunn diodes on the basis of Al1xInxN for various values of concentration of impurity in active area in biharmonic regime are present. It is shown, that using of voltage of the complex form leads to increase of efficiency generation at the basic harmonic in comparison with work in harmonic regime. The increase of impurity concentration in active area leads to increase of efficiency generation both on the first, and on the second harmonic. At the expense of effective work on the second harmonic there is a possibility of reception of generation to frequencies of a submillimetric range.
Download >>
founded: 58 result (s)
