1. 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 №834 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
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2. Features of forming patterns of planar antennas arrays A.A. Bulgakova, N.N. Gorobets, V.A. Katrich, V.A. Lyashenko planar arrays, pattern, sidelobes, radiator elements, interference maximums triangular grid Vestnik KhNU №712 Pages. 7175
Computer analysis results of an influence of a radiating aperture form of the planar array on its pattern have been presented. It is shown that there is dependence of levels of interference lobes and also near and far sidelobes of pattern in one of main positions of observation planes on number and radiators in plane which is orthogonal to main observation plane
3. Features of radiation defect formation in kdp crystals under different kinds of irradiation A.N. Levchenko KDP single crystal, UV, ionizing irradiation, radiation centers, ESR Vestnik KhNU №834 Pages. 9599
Formation processes of different types of radiation paramagnetic centers in potassium dihydrogen phosphate (KDP) single crystals under ultraviolet (UV), gamma, electron, neutron and proton kinds of irradiation have been investigated with the help of electron spin resonance (ESR) method. The dose dependencies of the relative concentration of the impurity electron centers containing arsenic ions and holelike centers with the hole localized on the porbit of oxygen ion have been measured. The comparison of the effects of the different kinds of irradiation on the radiation paramagnetic defect formation processes has been carried out
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4. Features of the calculation of Focktype integrals V.I. Vyunnik, A.A, Zvyagintsev Focktype integrals, numerical integration, error estimate Vestnik KhNU №834 Pages. 5262
Calculation of Focktype integrals, used at the solutions of the diffraction problems on convex bodies is considered. The method of calculation of this integrals is described, and the estimation of their convergence is given. Range of values of the complex parameter, describing a surface impedance, for which the given method is applicable is determined. The estimation of the error of calculation is carried out
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5. Features of the forest radio emissi L.M. Atroshenko, K.P. Gaikovich, N.N. Gorobets, V.N. Gorobets radio emission, a forest Vestnik KhNU №806 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.
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6. Fields of the rectangular loop antanna in nearfield zone N.N. Gorobets, А.V. Trivaylo electromagnetic waves, radiation, nearfield zone, Hertz vector, traveling wave antenna, loop antenna Vestnik KhNU №834 Pages. 1824
On the basis of potential Hertz technique the expressions for calculating of all components of electromagnetic radiation fields of rectangular loop antenna, stimulated by the running wave of the current in Spherical and Cartesian coordinate systems unrestricted on the size of radiator and distance up to a point of observation have been derived. It has been shown that in a near field zone of radiation electromagnetic vectors in the Cartesian and Spherical coordinate systems have all 6 component. It has been shown that wave processes near by the examined radiators are distinguished by great gradients of amplitudes of the electromagnetic fields
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7. 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 №883 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
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8. Frequency multiplication at impact ionization in GaNdiodes О. V. Botsula, D. V. Pavlenko, E. D. Prokhorov the GaN diode, coefficient conversion transducing, drift velocity, harmonics Vestnik KhNU №834 Pages. 100103
The frequency multiplication at impact ionization in transfer electron GaN diodes nave been considered. The coefficient conversion transducing increase if impact ionization in GaN diodes takes place have been demonstrated. For example, coefficient conversion transducing in second harmonic arrive at 40 %.
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