2007, volume 12, № 3

 

 

HIGH AZIMUTH ELECTROMAGNETIC OSCILLATIONS HE- AND EH-TYPE IN THE COMPOSITE DISK DIELECTRIC RESONATOR

Kirichenko A. Ya., Martynyuk S. P., Motornenko A. P., Skuratovskiy I. G.

465-470

The resonance structure composed of the disk dielectric resonator (DDR) and auxiliary dielectric disk the diameter of which is more than DDR diameter has been considered. The disk is located on the main resonator axisymmetrically and its permittivity is less than DDR permittivity. This resonator was named as a composite disk dielectric resonator (CDDR). The resonance peculiarities of the high azimuth electromagnetic HE- and EH-oscillations of the whispering gallery in CDDR for the millimeter wavelength band have been experimentally investigated. The influence of the strongly absorbing liquid located in the auxiliary disk on the oscillations characteristics in this resonator has been studied too.

 

 

SCATTERING OF ELECTROMAGNETIC WAVES BY STRIPS SYSTEM WITH VARIABLE FRACTAL DIMENSION

Koshovy G. I.

471-475

The scattering problems of electromagnetic waves by strips systems with variable fractal dimension is considered. The cross-section of the system is an stage of the CSA-fractal. The problem is reduced to a system of singular integral equations (SIE) of the first kind. The system of the SIE is convenient both for application of the mechanical quadratures method 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 scatterer the quasi static model (it supposes a simple explicit solution) is presented. Numerical results of far-zone field’s calculations are carried out.

 

 

INVESTIGATINS INTO THE FIELDS OF A BOUNDED PLANAR DIELECTRIC WAVEGUIDE

Provalov S. A., Andrenko S. D.

476-481

Fields distributions (in broadside and longitudinal directions) of bounded planar dielectric waveguide have been studied. The results of the research allow to draw a conclusion about the fitness of electrodynamic system in the form of width-bounded dielectric waveguide (width consists of several tens of wave lengths) both for diffraction grating excitation and for ductwork of electromagnetic field of millimeter band at a distance of 200 wave lengths.

 

 

RADIOWAVE DIELECTROMETRY WITH USE OF GEOMETRIC-PHASE SCANNING METHOD

Yevich N. L.

482-488

The method of dielectric materials permittivity value measuring in the range of millimeter electromagnetic waves with use of the antenna with geometric-phase scanning representing a surface wave antenna with piecewise linear phase distribution of fields, which exciting it's shoulders while value of shoulders varies during scanning is offered. Theoretically and experimentally demonstrated the opportunity of the solution of a return problem, definition of quantity of a complex permittivity with use of a global minimization method is shown.

 

 

TO THE NATURE OF RESONANT PROPERTIES OF TWO-DIMENSIONAL PERIODIC SCREEN WITH UNDER CUTOFF HOLES

Кirilenko А. А., Perov А. О.

489-497

To explain resonant behavior of the perforated screen with circular under cutoff holes the eigenoscillations of the screen as open resonant structure are considered. The effect of enhanced transmission through such screen is investigated. It is found that the initial origin of those effects is the existence of the eigen-oscillation of the interface between the free space and the metal that is perforated with double-periodical set of holes.

 

 

TRANSFORMATION OF THE ELECTRODYNAMIC CHARACTERISTICS OF THE QUARTERSPHERE DIELECTRIC RESONATOR BY THE COUPLING SLOT IN THE MIRROR

Kogut A. E.

498-507

It is shown, that as against the hemispherical dielectric resonator excited on the whispering gallery modes by the coupling slot in a mirror, spectral and power characteristics of the quartersphere dielectric resonator, and also distribution of resonant fields of modes depend on position of a coupling slot on azimuthal coordinate. The existence of the whispering gallery modes is possible in the quartersphere dielectric resonator in the case of the open one plane basis.

Characteristics of such dielectric resonator are investigated. It is shown, that the quartersphere dielectric resonator can form base of the power adder for summation of the power more than two Gunn diodes. The modes of mutual synchronization of oscillations of two and three diodes in the quartersphere resonator are investigated.

 

 

IMPROVEMENT OF COUPLING CHARACTERISTICS OF SAPPHIRE QUASIOPTICAL DIELECTRIC RESONATOR BY MICROSTRIP LINE

Skresanov V. N., Golovashchenko R. V., Nechayev O. G.

508-514

Experimentally regularities of coupling a quasioptical dielectric resonator (QDR) to a microstrip line are discussed in Ku-band. It is offered to organize coupling in space “a microstrip line placed under QDR”, which differs from a known mode of connection “QDR placed on a microstrip substrate”. It is shown, that at connection by a mode “a microstrip line placed under QDR” an energy loss of a resonance field in a substrate are negligible small as contrasted to natural energy losses in QDR. Presence of several coupling areas, disjointed by zones of lack of coupling both for quasi-E, and for quasi-H oscillation modes is revealed.

 

 

THE WAVE DIFFRACTION BY A GRATING ATTACHED TO HYROMAGNETIC MEDIUM BOUNDARY

Brovenko A. V., Melezhik P. N., Poyedinchuk A. Ye., Troshchylo A. S.

515-525

A new method is suggested for solving the problem of electromagnetic wave diffraction by a strip grating placed at the boundary of a hyrotropic ferromagnetic medium. The method is based on the analytical regularization procedure and uses explicit solution of the Riemann-Hilbert boundary value problem with the conjugation coefficient depending on the excitation wave frequency.

Numerical algorithms and calculating programs realizing the method have been designed. The reflection coefficient of a strip grating attached to an ideal ferromagnetic medium is studied as a function of the excitation wave frequency. The frequency region of the total reflection of an E-polarized plane wave has been found. Long-wavelength approximation formulas describing the principal harmonics of diffraction spectrum have been obtained. The frequency range of their application is shown.

 

 

IMAGING USING A NON MOVING ANTENNA ARRAY, NOISE SIGNALS AND SAR METHOD

Lukin K. A., Mogyla A. A., Vyplavin P. L.

526-531

The work is dedicated to elaboration of a method of SAR imaging using noise/random signals and a non moving and non switching antenna array which were proposed in [1]. The main idea of the method consists in the extraction from the total signal of one channel receiver the signals radiated by a single element of the array. Such separation is done using correlation reception of the noise/random signals radiated and received by a antenna array with mutual delay between antenna elements higher than the correlation time of the radiated signal. Attractive advantage of the suggested the method for SAR imaging consist in no need in either mechanical motion or electronic switching of the antenna array elements, which simplify its design and lower the cost. The SAR imaging algorithm is described and the results of modeling of SAR using this antenna array are presented.

 

 

INVESTIGATION OF UHF RADIOWAVE ATTENUATION FACTOR IN THE REGIONS OF THE WORLD OCEAN

Kostina V. L., Mytsenko I. M., Roenko A. N., Khomenko S. I.

532-538

Attenuation factor  and its distance dependence  are the important features of the propagation path. Due to a lot of factors influencing radiowave attenuation over oceanic surface as well as the lack of regular experimental data the complex radiophysical investigations were carried out in the different regions of Atlantic, Indian, Arctic and Pacific oceans. The results obtained allow creation of attenuation factor distance dependence data base. The latter makes it possible to solve rationally the problems of data arrays control, operative access and arrays selection according to the function of inquiry.

 

 

POLAR IONOSPHERIC NON-UNIFORMITY CAUSED BY SOLAR PROTON EVENTS

Rabinowich L. M., Shvets A. V., Nickolaenko A. P.

539-551

The formal numerical analysis demonstrated that polar non-uniformity of lower ionosphere arising during powerful Solar proton events (SPE) is able to noticeably modify the spectra of global electromagnetic (Schumann) resonance. Properties are discussed of resonance spectra, their dependence on the positioning of observer and the source. Computational data are compared with observations performed from 2000 to 2003, an interpretation is suggested for experimental data. Parameter of polar non-uniformity is evaluated from the Schumann resonance records.

 

 

RAYLEIGH WAVES IN SEMIBOUNDED MAGNETOACTIVE SOLID STATE PLASMA

Averkov Yu. O., Bass F. G., Yakovenko V. M.

552-557

The resonance interaction of the Rayleigh wave and a surface helicon, which propagate along an interface plane of a vacuum - solid-state plasma in the presence of high magnetic field, is investigated. The obtained results give the possibility of excitation of a surface sound with the aid of a magnetic dipole that is placed near the interface. The expression for the decrement of the collisionless relaxation of the Rayleigh wave into bulk helicons is derived. It has been shown that at low temperature this relaxation mechanism dominates over usual collision relaxation of a surface sound.

 

 

RESONANSE EFFECTS DUE TO EXCITATION OF THE SURFACE WAVES IN LAYERED SUPERCONDUCTORS

Kats A. V., Nesterov M. L., Nikitin A. Yu., Nori F., Savel’ev S., Slipchenko T. M., Yampol’skii V. A.

558-562

The resonance effects due to surface Josephson-plasma waves (SJPW) excitation on the periodically-modulated layered superconductor are considered. It is shown that the absorption of the incident electromagnetic wave can be substantially increased at certain incident angles due to the resonance excitation of the SJPW. The optimal parameters of the problem corresponding to SJPW excitation and the effect of the total suppression of specular reflection (TSSR) are found for a real medium (Bi2212). The model of THz detectors based on an effect of the TSSR is proposed.

 

 

THE DIFFUSION PARAMETERS DETERMINATION METHOD IN GETEROPHASE MATERIALS

Posukhov A. S., Semenenko V. Y., Stervoyedov N. G.

563-566

The results of diffusion parameters determination in composite materials methodic upgrading are presented. The practical abilities and experimental results of diffusion measurements of Ni63 in Al and Ni alloys are showed.

 

 

DETERMINATION OF THE ALLOWED FREQUENCIES OF DISTRIBUTION OF ELECTOMAGNETIC WAVES IN 2D PHOTONIC CRYSTAL BY THE COUPLED WAVES METHOD (CWM)

Fitio V. M., Bobitski Ya. V.

567-575

It is shown in work, that at imposition of a periodic boundary conditions it is possible quickly to define there is this frequency of allowed for distribution in 2D photonic crystal by the coupled waves method (CWM), which use for the analysis of diffraction of electromagnetic waves in plane 1D grating. A problem is reduced to the task of higher algebra on the eigenvalues and eigenvectors of type  and verification on equality of the module  to unit. If , the intended frequency is allowed. The dimension of vector  is equal to the doubled number of the used coupled waves  at a calculation, and is determined by the required accuracy of analysis. High accuracy of determination of the allowed frequencies of branches of band structure at, which determine the band gap of photonic crystal, is provided. The use of symmetry gives possibility to pass on to the dimension of  vector  or  without the loss of accuracy with the simultaneous diminishing of time of calculation approximately in 8 times.

 

 

FEASIBILITY OF DEVELOPING HIGHER-SPACE HARMONIC COAXIAL MAGNETRON

Skripkin N. I., Gurko А. А.

576-578

The results fro evaluating the possibilityes for developing higher-space harmonic coaxial magnetrons under -mode at the 2-mm wavelength band.

 

 

ENERGY AND FREQUENCY CHARACTERISTICS OF GAAS GUNN DIODES WITH AL_XGA_1-XAS AND GAP_XAS_1-X CATHODES

Storozhenko I. P., Arkusha Yu. V., Prokhorov E. D.

579-583

Operation of the GaAs TED’s with AlxGa1-xAs and GaPxAs1-x cathodes is studied with the two-level model of intervalley electron transfer in the semiconductors. Fundamental behaviors and specialty operation of the GaAs TED’s with forward bias isotype heterojunction in cathode are defined. Energy and frequency cha-racteristics are calculated. Boundary operation frequencies are determined.

 

 

ACCURACY ANALYSIS OF SIGNAL RECONSTRUCTION BY USING NORMALIZED BISPECTRUM DENSITY ESTIMATION

Totsky A. V., Molchanov P. A.

584-588

The accuracy analysis of unknown signal shape reconstruction is considered for argument bispectrum estimation and normalized bispectrum estimation techniques. Results of computer simulations demonstrate a possibility of signal shape reconstruction accuracy improvement by using smooth functions as normalized bispectrum density estimates computed in the presence of additive Gaussian and impulse noise.

 

 

WAVE RANGES ON THE BASE OF METAL-DIELECTRIC WAVEGUIDE OF SQUARE CROSS-SECTION

Bezborodov V. I., Kiseliov V. K., Kuleshov Ye. M., Yanovsky M. S.

589-594

Quasi-optical and radio-measuring devices and components of high frequency sections produced on the basis of metal-dielectric waveguides of 10х10 mm and 14х14 mm square cross-sections operating in 176-410 GHz and 110-260 GHz frequency ranges, respectively, have been described. The functional capabilities and parameters of the devices don’t yield to analogous devices operating in longer-wave ranges and in a number of cases exceed them.

 

 

ALGORITHM CALCULATION OF PHASE CORRECTOR TRANSFORMER OF QUASI OPTICAL WAVEGUIDE DIAMETER

Goroshko A. I.

595-597

Diverging aplanatic lens calculation algorithm has been described. In it has used principals of graphical method development of profiles of focusing lens. Main factors affected on accuracy of calculation have shown. Diverging lens are needed at the development of a devices for connecting quasi-optical waveguides which has working diameter with low losses of primary wave.

 

 

THE CONTROL OF MULTIPACTING DISCHARGE IN HIGH QUALITATIVE STRUCTURE ION LINEAR ACCELERATOR

Lobzov L. D., Shulika N. G., Belan V. N.

598-609

The appearance of multipacting discharges in diod gaps of multicells structure of ion linear accelerator, without system stability electrodynamics parameters, is considered to be one of the main breaking factors of its electrodynamics parameters, when it is impossible to achieve the required characteristics of accelerating fields, but also the stable RF generation in its general system of complex connected oscillatory contours, which is broken by the indicated discharges in one of them. With suppression of conditions of secondary electron multiply and of removing of the possibility of their number growing in time up to the size of multipacting discharges, the conditions of the stable RF generation and work the whole system of accelerator agitation on the whole, may be satisfactory. For many starting-repairing and technological works on the accelerator, the solving of a problem of the suppression of parasite multipacting discharges and the reaching of stable character of RF voltage installation is considered to be the final stage. It is experimentally shown the control of multipactor processes, from their maximal influence on the character of transitional processes of installation of RF voltage on the elements of structure of linear accelerator up to a full suppression resonance multiply electrons with material electrodes and the achievment of nominal amplitudes of accelerating fields in linear accelerator.

 

 

MEASURING SHOULDER OF MILLIMETER-WAVEBAND INTERFEROMETER FOR THICKNESS CONTROL OF THE THIN DIELECTRIC EILMS

Budanov V. E., Suslov N. N., Shubenko A. L., Stepanov V. Yu.

610-614

The new wave guiding tract which is consist of the parallel plates of open waveguide and two sector horns of special geometry, which ones are provide in the measuring interferometer's shoulder of an submillimeter resolving capacity in the 4-mm waveband at the contact less thickness dielectric films control during their production is under consideration.