2007, volume 12, ¹ 1
SCATTERING OF ELECTROMAGNETIC WAVES BY PREFRACTAL STRIPS SYSTEM
Koshovy G. I.
141-147
The problem of scattering of the E-polarized electromagnetic wave by systems of cylindrical strips is considered. The cross-section of the system is an pre-fractal of the Cantor set. The problem is reduced to a system of singular integral equations (SIE) of the first kind with respect to surface currents' density. The system of the SIE is convenient both for application of direct numerical method (mechanical quadratures) and for its transformation to a second kind's integral equations by the Vekua-Carleman's method of regularization. Except for common dynamic model of the problem, the quasistatic model (it supposes a simple explicit solution) is presented. The comparison of numerical results of calculations by the indicated methods for the models is carried out.
FINITE ELEMENT MODELING OF ACOUSTOOPTIC DISCRETE DATA PROCESSING DEVICES
Rudiakova A. N., Lipinskii A. Y., Danilov V. V.
148-155
Successful design of digital acoustooptic devices includes the quite complex step of physical phenomena modeling. This phenomenon is interaction between optical and acoustic waves within the acoustooptic media, and its investigation requires the using of numerical methods. The paper presents the vector time-domain finite-element method for the modeling of finite-size acoustooptic interaction region. Obtained angle relations between the diffraction maximums of zero and first orders are agreeing with the physical model of diffraction.
"WHISPERING GALLERY" OSCILLATIONS IN DIELECTRIC HEMISPHERICAL RESONATOR WITH IMPERFECT CONDUCTIVE PLANE
Filipov Yu. F.
156-162
A theory of eigen oscillations in a hemispherical resonator placed on imperfect conducting surface has been developed. Satisfy the boundary conditions on imperfect conducting surface we give a functional equation. Its solution determines the polar complex index. Satisfy the conditions of continuity of tangential electromagnetic field components we find the characteristic equation. Its determining spectral features of semi-spherical resonator, excited at "whispering gallery" oscillations.
THREE-WAVE INTERACTIONS OF THE ELECTROMAGNETIC WAVES IN A LAYERED PERIODIC STRUCTURE
A. A. Bulgakov, Y. A. Olkhovskiy, O. V. Shramkova
163-167
In this work, we consider three-wave interaction in
dielectric layered-periodic structure. We investigate an infinite dielectric
layered-periodic structure. One of the layers forming a period is assumed to
have nonlinear polarization. The nonlinear dielectric is assumed to have 
anisotropy and its
optical axis is directed along the axis of periodicity. The synchronism conditions are analyzed. The anisotropy of this
symmetry class leads to the fact that the TM polarization waves are connected
with the TE waves. The TE waves are connected with the TM waves. It is considered
the resonances that are specific to a periodic medium. It is demonstrated the
resonances significantly increase are efficiency of nonlinear interaction.
MICROWAVE PROPAGATION FACTOR AT SMALL GRAZING ANGLE OVER SEA: THE MODEL OF MULTIPLE KNIFE-EDGE DIFFRACTION
V. B. Razskazovskyy, Yu. F. Logvinov
168-176
The peculiarities of the microwave propagation factor over disturbed sea surface have been investigated by numerical method using the multiple knife-edge diffraction model. The case of low grazing angles and small height of the receiver over the surface has been considered. It has shown that such a model allows explaining experimentally observed peculiarities of the field at the receiver height compared with that of the sea waves, in particular, essentially higher values of the propagation factor than the ones predicted through Kirchhoff approximation.
MICROWAVE PROPAGATION FACTOR AT SMALL GRAZING ANGLE OVER SEA: TRANSIENT REGION
V. B. Razskazovskyy, Yu. F. Logvinov
177-184
The peculiarities of the field of centimeter and millimeter radio waves over rough see surface are investigated in the transition region of small grazing angle, it is below than which necessary to use the model of multiple knife-edge diffraction on the wave crest, and higher Kirchgoff method is applicable.
It is shown that multipath propagation of radio wave is applicable in it, the properties of coherent and uncoherent component of the field forward scattering as function geometry of radio path and sea state is analized.
DYNAMICAL PROPERTIES OF SOIL ELECTRIC CHARACTERISTICS DEPENDING ON FILTERING PROPERTIES OF ROCK AND STRATIFICATION OF A ZONE OF AERATION
V. G. Sugak
185-191
It is stated method allowing to connect moisture filtering processes in subsurface layers of zone of aeration (ZA) with their electrical constants. The method is based on numerical decision of moisture filtering equations. As a result it is obtained a distribution of moisture in ZA on depth. And on the basis of electro dynamical model of electrical constants of soils it is calculated a distribution of complex dialectical permeability on a depth.
ANALYSIS OF MICROWAVE PROPAGATION ABOVE OCEAN SURFACE DURING SOLAR ECLIPSE
I. M. Mytsenko
192-194
Results of the experimental investigation of microwave propagation above Indian Ocean surface during solar eclipse (February, 1980) is presented. The causes of the signal strength increase including the tropopause influence and evaporation duct as ones of the most probable are examined.
USING OF GEOSTATIONARY SATELLITES RADIATION FOR DETERMINATION OF HYDROMETEORS PARAMETERS
I. M. Mytsenko, D. D. Khalameyda, S. I. Khomenko
195-198
The possibility of using of geostationary satellites radiation at high elevation angles for determination of hydrometeors parameters (rain, snow, hail, cloud) is discussed. Description of the equipment structure diagram and results of the experimental investigations of low-, medium- and high-level clouds main forms are shown. The apparatus for recognizing clouds is quite simple and cheap.
BISTATIC RADAR WITH ILLUMINATION IONOSPHERIC SIGNALS OF UHF COMMUNICATION STATIONS
I.V. Lutsenko, I.V. Popov, V.I. Lutsenko
199-203
The possibility of air objects detection in bistatic radars of decameter band, using as illuminator the ionosphere wave signal of communication stations is considered. Radar cross section estimation for the basic air objects types are cited, that are the detection objects. Spectral characteristics and their dependences on distance to the illuminator were investigated experimentally. Determined that relation of the illuminating signal carrier spectral density to noise spectral density in the frequency band typical for the Doppler frequency bias of the signal scattered from air objects is 40-50 db for the most stations. The requirements to the depth of forming of directional pattern null in the illuminator direction are determined. The possibility of bistatic systems complex constructions that used the communication UHF stations and provide determination of position of object detection using information about bearing Doppler frequency bias of receiving from object signal is considered.
THE INTERACTION OF CHARGED PARTICLE FLOWS WITH PLASMA OSCILLATIONS IN A PLATE
S. I. Khankina, V. M. Yakovenko, I. V. Yakovenko
204-208
The interaction of electromagnetic oscillations with an electron flow passing through an inhomogeneous structure consisting of layers having different electromagnetic properties and framed on the edges by perfectly conducting surfaces is investigated
The eigen oscillation frequencies of the electromagnetic field of such a structure and their decrements (increments) resulting from the mutual conversion of the kinetic energy of a beam particle and the electromagnetic field energy are determined.
COMPETITION OF SELF-ORGANIZED ROTATING SPIRAL AUTOWAVES IN NONEQUILIBRIUM DISSIPATIVE SYSTEM WITH THREE-LEVEL ACTIVE CENTERS
D. N. Makovetskii
204-208
Competition of self-organized rotating spiral autowaves (RSA) is computationally studied in a nonequilibrium dissipative system possessing excitability and the two-channel diffusion of excitations. Such the system consists of locally interacting three-level active centers (AC) having properties close to ones for AC in the phaser (microwave phonon laser). Dynamical stabilization and coexistence of RSA with different topological charges were observed under conditions of their weak competition. A phenomenon of self-induced reversing of the sign of topological charge was revealed for the case of strongly competing RSA; the mechanism of this nonlinear phenomenon is found. Perspectives of investigations of RSA in nonequilibrium dissipative systems with excitable three-level AC are discussed.
ABSORPTION OF ELECTROMAGNETIC WAVES INTO PERIODIC STRUCTURE AND THIN FILM OF METAL WHEN A RESONANCE OF PLASMONS APPEARS AS A RESULT OF PRISM EXCITATION
V. M. Fitio, H. P. Laba, Ya. V. Bobitski
223-229
Using the coupled wave method an absorption of electromagnetic waves in a grating-metallic substrate system has been analyzed, at that a grating can be both dielectric and metallic. It is proved that at certain wavelength resonance of plasmons can be achieved. That results in completed absorption of electromagnetic wave by system. For comparison the research of plasmons resonance excited by a prism into thin silver film has been carried out. It is ascertained that here on certain conditions completed absorption can be attained, too, at that within resonance range a strong dependence on incidence angle at metallic film has been observed. It is shown that for both methods of plasmons excitement whithin resonance range the identical dependences of reflectance on refractive index of medium, which contacts directly with gratings and thin metallic film, has been observed, at that the refractive index change by 0,001 leads to the reflection coefficient change from zero to 0,8.
COMPLEX IMPEDANCE OF A SKIN LAYER OF A PLASMA JET GENERATED WITH AN EXPLOSIVE METHOD IN FREE SPACE
O. O. Puzanov
230-235
The analytical expressions describing the frequency dependence of complex impedance of a skin layer of a plasma jet, generated using an explosive method have been obtained. The measured characteristics of the plasma are used to calculate the resistance and reactance.
POWER AND SPECTRUM PERFOMANCE OF QUASI-OPTICAL SOLID-STATE MM-WAVE OSCILLATOR
Î. I. Belous, A. I. Fisun, Î. N. Sukhoruchko
236-242
Description of the corner-eshelette resonator has been presented. A two-dimensional model of resonator under consideration is presented and some operating modes, in particular, quasi-fundamental mode with a field compression have been analysed. Gunn-diode oscillator characteristics are investigated. Oscillator is stabilised by the reactive-reflected resonator which excited at the quasi-fundamental mode. Short-time frequency instability is no less than 10-8 sec-1. Relative long-term instability DF/F ~ 10-7 0C.
SINGULARITIES FORMATION AND DRIFT OF VOLUME CHARGE WAVE IN BASED VARIBAND GAPX(Z)AS1-X(Z) INTERVALLEY TRANSFER ELECTRON DEVISES
I. P. Storozhenko
243-249
Singularities formation and drift of volume charge wave in based variband GaPx(z)As1-x(z) Gunn diodes with n+-n cathode has been studied. These diodes are shown exist of phenomena’s which not in employing spatially efficiency homogeneous semiconductors. To made extension of À3Â5 variband threefold semiconductors.
SHAPING OF A BEAM WITH A UNIFORM INTENSITY DISTRIBUTION IN THE ACTIVE RESONATOR OF WAVEGUIDE CO2-LASER
O. V. Gurin, V. A. Maslov, V. A. Svich, A. N. Topkov
250-254
On the basis of a method of decomposition on processes of diffraction and an amplification-refraction the estimation of influence of an active medium on the irradiation profile in the proposed construction of new waveguide ÑÎ2-laser with the homogeneous output beam is carry out. It is shown, that at choice optimum sizes of the resonator mirrors and the multimode waveguide, parameters of the spatial filter on the nonuniform mirror the active medium can promote a decrease of the diffraction losses of a basic mode and a increase uniform of an output beam profile of a laser radiation.
INFLUENCE OF CONSTRUCTION-TECHNOLOGICAL SOLUTIONS OF SILICON SOLAR CELLS ON MINORITY CHARGE CARRIERS PARAMETERS IN THEIR BASE CRYSTALS
M. V. Êirichenko, R. V. Zaitsev, N. V. Deyneko, V. R. Êîpach, V. À. Àntonova, À. Ì. Listratenko
255-262
The investigated values of lifetime τ and diffusion length L of minority charge carriers in base crystals of silicon solar cells (Si-SC) according to their various construction-technological solutions are presented. The optimal construction-technological solution version for Ukrainian monocrystalline Si-SC was suggested on the basis of the carried out comparative analysis of received τ and L values.
INVESTIGATION OF THE DEVELOPMENT CAPABILITY OF HIGH EFFICIENCY SILICON SOLAR CELLS WITH P-I-N BASE STRUCTURE
L. P. Shuba, M. V. Êirichenko, V. R. Êîpach, V. À. Àntonova, À. Ì. Listratenko
263-267
Test samples of solar cells (SC) with p-i-n structure on the basis of very poorly phosphorus doped silicon crystals of i (n-)-type conductivity by thickness about 300 μm with resistivity of 4000 Ohm cm were manufactured and investigated. The ð- and n-type layers by thickness 1,5 μm with boron and phosphorus concentration ~ 1020 cm-3 were prepared according to technology used in serial production of Ukrainian monocrystalline Si-SC. Photocurrent density JP, output and diode parameters of SC were determined from the loading illuminated current-voltage characteristics measured at 25îÑ and in conditions of extra-atmospheric solar radiation (ÀÌ0 regime – air mass equals zero). The found out value JP = 48,6 mÀ/cm2 is the record for Ukrainian monocrystalline Si-SC that causes the expediency of serial Si-SC development with p-i-n structure. The influence of weakly concentrated radiation on the efficiency of such type SC was investigated. The proposals on improvement of Si-SC design with p-i-n structure ensuring their efficiency increasing up to 20% were grounded.
SOLID-STATE INTERFEROMETER WITH THE OPERATING FREQUENCY 280 GHZ
A. V. Zorenko, G. P. Ermak, M. O. Medved
268-272
There investigated the 280 GHz solid-state heterodyne interferometer aimed to measure the electron density of plasma. A low level of the phase fluctuations of the output signal is achieved by means of high order multiplier and up-converter based on IMPATT diodes. For exclusion of the influence of signal fluctuations on the accuracy of the phase measuring in the interferometer there used the quadrature processing on the intermediate frequency and the amplifiers with AGC circuits. The phase drift of the output signal does not exceed +/- 0,50 and a dynamic range for receiving signal is about 40 dB.
THE FEATURES OF DIRECT AND INDIRECT INFLUENCE SMALL MICROWAVES INTENSITY ON SEEDS AND MICROORGANISMS
O. I. Kovalenko, F. V. Kivva, S. V. Kalinichenko, A. L. Kovorotniy
273-282
During 2003 - 2005 the systematic experimental investigation of peculiarity influence of microwaves small intensity on seeds and corinebacterium is carried. The two ways were realized: in first time influence was operated on water and then bioobject, ring other time - in opposite directions.
In K and Q band we used standard generators G4-141 and G4-142 when operated in describe band f = 37,5 - 18,33 GHz. In wide band noise fractal signals, including low and high frequency, the influence was carried out in difference. It shows that possibility long time of modification the functional property the biological objects by electromagnetic way. The biological results are function of frequency, band width, the capable of modulation and the averege energy of field. The biological effects are especially interesting in case when influence was executed by means of water.
ENERGY OF PROCESSES OF ELECTROMAGNETIC RADIATION PARAMETERS TRANSFORMATION BY QUASI-OPTICS PHASE CHANGERS AND FREQUENCY SHIFTERS
V. N. Polupanov, P. K. Nesterov, M. S. Yanovsky, V. I. Bezborodov
283-286
The transformation of the electromagnetic radiation parameters by continuous (polarizable) phase changers and quasicontinuous (Dopler’s) frequency shifter has been considered with regard to quantum native of EMR.