2004, volume 9, ¹ 3
REGULARIZATION OF A BOUNDARY VALUE PROBLEM FOR AN ARBITRARY SCALAR WAVE DIFFRACTION BY SEGMENT OF SPHERE. NEUMANN PROBLEM
Svishchov Yu.V.
479-489
The diffraction problem of an arbitrary scalar wave by sphere with a circular aperture is considered (Neumann problem). Resonance and scattering characteristics for plane wave’s scattering case have been investigated. In particularly, the mode coupling effect have been discovered.
ABOUT POSSIBILITY OF PURE CONVERSION OF ÒÅ1-WAVE IN ÒÅ2 OR ÒÅ3 ON THE CASCADE OF THREE STRIP DIAPHRAGMS
V.V.Shcherbak
490-495
Resonant regimes of wave scattering on the cascade of unalike thin multistrip diaphragms in regular (rectangular or round) waveguide are investigated. The possibility of pure transformation of energy of main ÒÅ1 ‑wave in ÒÅ2 or ÒÅ3 ‑wave by three diaphragms is proved (including deriving of flat-topped frequency characteristic of mode conversion). Nontrivial retunings of the cascade into pure inverse transformation are found.
SPECTRAL PROPERTIES OF DISK QUASI-OPTICAL DIELECTRIC RESONATOR WITH HETEROGENEITY IN A FORM OF WATER-FILLED CAPILLARY
Lavrinovich A.A., Filipov Yu.F., Cherpak N.T.
496-502
The results of experimental research and theoretical analysis of spectral properties of whispering gallery HE-mode oscillations in a disk quasi-optical dielectric resonator (QDR) with heterogeneity are presented. Heterogeneity is conditioned by placing of capillary in direction parallel to the axis of resonator. At filling capillary with liquid or metallic conductor, the resonator frequency shift with regard to the frequency of the resonator with empty capillary is observed. We have found that behavior of eigen frequencies of the QDR with different liquids depends on diameter of capillary. So, at d < 0,65 mm trend of dependences of frequency of the QDR with water and alcohol coincides. However, at d > 1.0 mm a frequency shift for water changes a sign. At the further increase of the d, behavior of the dependence of frequency shift for water is similar to the behavior of the shift for a metal.
DIFFRACTION OF LIGHT ON TWO ULTRASONIC WAVES WITH DIFFERENT FREQUENCIES
Kupchenko L.F., Rubalka G.V., Efimova O.V.
503-508
using the method of the continued fractions analytical expressions for amplitudes of the making first and zero orders of bragg’s diffraction at co-operation of light wave with two ultrasonic waves of different frequency are got. The diagrams illustrating an effect of competition of defragging fashions at the change of amplitudes of each of two ultrasonic waves, are built. It has been set that the increase of Cline-Cuck wave parameter brings to the increase of steepness of the explored dependences.
THE SURFACE CURRENTS INDUCED BY THE E-POLARIZED WAVE IN CURVILINEAR STRIPS
G.I. Koshovy
509-514
The problem of scattering of the E-polarized electromagnetic wave by cylindrical curvilinear strip is considered. The cross-section of the strip is an arc of a smooth curve. The problem is reduced to a singular integral equation (SIE) of the first kind with respect to surface currents' density. The SIE is convenient both for application of direct numerical method (mechanical quadratures) and for its transformation to a second kind's integral equation by the Vekua-Carleman's method of regularization. A large class of guide arcs for the cylindrical strips is examined. It includes some simple parabolic arcs where the limit passage to rectilinear segment is possible (important for testing) and rather difficult arcs that have many turning points. 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.
USING OF THE SIGNALS REFLECTED FROM THE SEA SURFACE FOR DIAGNOSTICS THE OPERATION RANGE OF THE SHIP BORN NAVIGATION RADAR OF THE CENTIMETRIC WAVE BAND
Mytsenko I.M., Khomenko S.I.
515-519
Experimental dependence of the sea surface reflection observation range (“illumination zone”) from the surface object observation one in centimeter wave band is determined. Methodic for diagnosing the operation range beyond the horizon of the ship born navigation radar is proposed. The diagnosis results are compared with experimental data obtained for different regions of the World Ocean.
APPLICATION OF THE ANGULAL NOISE CRITERION TO IMPROVE SMALL SURFACE TARGET DETECTION EFFICIENCY
Lutsenko V.I.
520-534
Statistical characteristics of the arrival angle fluctuations of the signals, scattered by small surface objects, sea surface and precipitations were investigated. The algorithms for objects detection based on information about received signal arrival angles were proposed, their efficiency were estimated. The principal possibility to improve detection efficiency of the surface objects, using the features of the object angular noise and clutter, caused by sea and precipitation echoes is shown.
APPLICATION OF DIELECTROMETRY METHOD FOR ESTIMATION OF GAS MIXTURE COMPOSITION
Belov E.N., Ivanov V.K., Krivenko E.V., Lutsenko V.I.,Prudkiy V.L., Khlopov G.I., Homenko S.I.
535-540
Dielectric qualities of air-gas mixtures at different pressures are investigated. Data of gas and air susceptibility are obtained. Principal possibility of determination of gas mixture composition by dielectric qualities is shown. Suggested proposal can be used for moisture load estimation in cargo gas.
GPS SIGNAL’S CHARACTERISTICS VARIABILITY IN THE ABOVE-WATER LAYER OF THE ATMOSPHERE
Zamarajev V.B., Kabanov V.A., Morgun G.M., Sinitsky V.B.
541-548
The results of experimental observations of the GPS satellite sets over sea surface are presented. The peculiarities of signal interference in different conditions caused by troposphere refraction effects and sea roughness are discussed. It is shown that the set point and the first lower minima of interference structure are characterized by maximum angular variability due to refractive effects. The influence of the seasonal variations of the troposphere refractive index value over the surface on the set point position variations is estimated.
EDGE MAGNETOPLASMONS IN A FINITE ARRAY OF TWO-DIMENSIONAL ELECTRON GAS STRIPS
Beletskii N.N., Bludov Y.V.
549-555
The paper deals with the theoretical investigation of edge magnetoplasmons in an array of two-dimensional gas strips, consisting of a finite number of strips, arranged at an equal distance from each other and placed into an external magnetic field. Two types of the two-dimensional gas strips arrays are under consideration: an ordered array of two-dimensional gas strips with equal electron densities in all strips and a weakly disordered array of two-dimensional gas strips, which is characterized by the fact that the density of electrons of one defect strip was different from that of other strips. It is shown, that the edge magnetoplasmon spectrum contains an infinite number of the edge magnetoplasmon kinds, which differ from each other by the distribution of electromagnetic field along a direction, perpendicular to the edges of stripes. The anomalous dispersion of the edge magnetoplasmons of higher kinds at long-wavelength range is predicted. For the weakly disordered array of the two-dimensional gas strips the existence of the edge magnetoplasmon local mode of each kind is found. In the case where the defect strip is arranged inside the array the existence of edge magnetoplasmon modes, which frequencies do not depend upon the defect strip parameters, is shown.
ON THE CALCULATION OF THE FORCE ACTING UPON A MOVING CHARGE IN A CYLINDRICAL DRIFT TUBE
Ilyenko K.V., Gorbik G.M., Yatsenko T.Yu.
556-561
Using the method of Green’s function in the Coulomb gauge, we calculate analytically the scalar potential and the density of induced charge on the cylindrical drift tube walls, which are caused by a moving low relativistic point-like charge. In the quasi-electrostatic approximation the force acting on the point-like charge from the charges induced by it on the drift tube walls is obtained as a function of the radial distance from the axis of the tube. Interpolation expressions are built for the force. Obtained results allow one estimates of influence of cylindrical drift tube walls, when studying the dynamics of non-neutralized particle beams moving in complex electromagnetic fields by the particle-in-cell method.
ON POSSIBLE MECHANISME OF SPONTANEOUS RADIATION OF NON RELATIVISTIC FREE ELECTRON BEAM IN MOTZ UNDULATOR
Kuleshov A.N., Pivovarova A.G., Yefimov B.P.
562-566
Results of experimental research of non relativistic electron motion in Motz undulator with longitudinal component of magnetic field are given in this paper. Resonance scattering of space charge waves on periodical inhomogeneities of electron beam formed by undulator static magnetic field was obtained in regimes of great current values. A question of possibility of influence of Cherenkov radiation mechanism influence on undulator system resonance radiation was discussed. The undulator model with adjustable longitudinal component of magnetic field for study of undulator radiation is offered.
RESONSNCE OPTICAL TRÀNSMISSION THROUGH PERIODICALLY MODULATED METAL FILMS
Kats A.V., Nikitin A.Yu., Nesterov M.L., Bludov Yu.V
567-579
The detailed theoretical analysis of light tunneling through a metal film (with a thickness exceeding substantially the skin-depth) and with a weak modulation of parameters (dielectric permittivity, surface relief, etc.) with absorption being taking into account is performed. Owing to the periodicity, under a certain relation between the angle of incidence, modulation spacing and a wavelength, the process of transforming photons of the incident wave to surface plasmon-polaritons (SPP) (in terms of the classical language, resonance excitation of symmetrical and antisymmetrical plasmon-polariton modes) takes place, which leads to the essential change in reflectivity and transmission. The cases of incline and normal incidence corresponding to the resonances of different multiplicities (single, double and fourfold) are investigated. It is found that even for a weak modulation the effect of practically total light transmission occurs (when the film is totally opaque). The systematic use of small parameters allowed us to present the results in a convenient analytical form. Optimal combinations of parameters (film thickness, modulation depth, etc.) corresponding to maximal transmission are found. The results are of essential interest in dealing with the problems of optical information technologies, in particular, for nano-chip design.
RESONATOR SYSTEM OF MAGNETRON WITH CELLS OF A COMPOUND STRUCTURE
Terekhin S.N., Horunzhiy M.O., Koshparo’nok V.N.
580-583
Are developed and marketed algorithms in the manner of software programs of the calculation of the indicative equations of magnetron resonator with a compound cross-sections cell. On base created algorithms are researched spectrum type fluctuations resonator systems of the magnetron with resonator of the type "sector-sector". Some advantages of the using magnetron are analyzed with cell of the compound structure.
BISTABILITY AND TRANSIENT PROCESSES IN A THREE-LEVEL PHASER SYSTEM SATURATED BY STANDING PUMPING FIELD AND RUNNING-WAVE SIGNAL
D.N.Makovetskii
584-595
Nonstationary processes in a three-level active paramagnetic phaser system are investigated for some cases of the inversion states branching (bistability) which takes place under the threshold of self-excitation of the phonon generation. It was shown that the nature of branching of the inversion states in such the system depends significantly not only on a hypersound signal intensity, but on the signal modulation frequency too. The narrow nonlinear resonances and critical slowing-down of transient processes are revealed at simultaneous saturation of a spin-system by standing electromagnetic pumping field and running-wave hypersound signal.
DEVICES FOR COMMUTATION AND MODULATION SHF POWER UNITS IN MM RANGE
Karushkin N.F.
596-602
There represented the results of investigations and development of semiconductor devices for power unit’s controlling in short-wave part SHF range with the use of p-i-n-diodes of concentration and distribution types.
TWO LEVEL RESONANCE TUNNELLING DIODES WITH TUNNELLING ANODE
Botsula Î.V., Prokhorov E.D.
603-607
A resonance tunneling diode with tunneling anode have being proposed. The current – voltage characteristics diode have three region of negative difference conductivity. First, second and third region can be use for microwave oscillator application have been demonstrated.
HELICAL EXPLOSIVE MAGNETIC DEVICES
Puzanov O.O., Soshenko V.A.
608-614
The history of advent of helical explosive magnetic generators and devices on its base is considered. The comparison of existing schemes is carried out.
MEASUREMENT OF ELECTRODYNAMIC PARAMETERS OF ONE-DIMENSIONAL WIRE GRATINGS IN THE SUB-MILLIMETER WAVELENGTH RANGE
Kamenev Y.Ye., Masalov S.A, Filimonova A.A.
615-618
The method of determining the transmission and phase shift of a passed wave through a one-dimensional wire grating at the field incidence on the grating being normal is suggested. The method relies on using the grating to be measured as an output mirror of a laser resonator at one end, and a 90° two-sided mirror at another. The measurements for various gratings have been performed experimentally by means of a sub-mm HCN-laser (l = 337 mm). The comparison was made between the results obtained and the theoretical calculations.
RADIOMETRY PRINCIPLES OF CONSTRUCTION OF THE THERAPEUTIC- DIAGNOSTIC UHF-APPARATUS WITH THE USE OF OWN RADIATIONS OF BIOOBJECTS
Plaksin S.V., Sokolovskiy C.I.
619-624
Radiometry principles of construction of the therapeutic-diagnostic UHF-apparatus on the basis of effects of interaction of the high-coherent electromagnetic fields with the fields, radiated by bioobjects are represented.