2005, volume 10, № 1

ELECTRODYNAMICS PROPERTIES OF SURFACE WAVES, WHICH PROPAGATE ALONG THE BOUNDARY OF TWO LAYER PERIODIC STRUCTURE

Bulgakov A. А., Olkhovskiy Y. А.

7-12

The electrodynamics properties of new type of surface waves, which propagate along the boundary of two various layer periodic structures, were considered. The analytic formulas for dispersion of these waves were received and the accounts of dispersion curves of surface waves were given. It was stated, that two types of waves were existed: surface waves, where dispersion curves asymptotically aspire to hybrid plasma frequencies, and surface waves between „dielectric zones”, when . The phase velocity in depend upon the collision frequency in semiconductor was investigated. It was shown, that increase of minimal wave velocity condition on growth of part of energy in layer with great dissipation.

COMPARATIVE ANALYSIS OF OPEN-ENDED WAVEGUIDE CHARACTERISTICS, OBTAINED BY EXACT AND APERTURE MODELS

Perov A. O., Tkachenko V. I., Kirilenko A. A. 

13-19

The problem of characteristics calculation for antenna with circular aperture is considered. The exact model based on Wiener-Hopf method is realized and is used for verification Kirhhoff approximation for horn and waveguide radiators.

THE INFLUENCE OF THE METALLIC MIRROR ON THE WHISPERING GALLERY STIMULATED OSCILLATIONS OF HEMISPHERIC DIELECTRIC RESONATOR

Kirichenko A. Ya., Kogut A. E., Bludov Yu. V., Golubnichaya G. V., Kutuzov V. V., Maximchuk I. G., Solodovnik V. A. 

20-24

H-type resonant oscillations spectrum of the dielectric resonator in form of hemisphere with metallic mirror and without it were investigated. It was established that H-type oscillations in contrast to E-type oscillations may be excited even if the mirror is absent. In this case rarefaction of spectrum and increasing of quality factor of resonant oscillations were observed. In addition the region of whispering gallery field localization and its intensity distribution on the dielectric resonator surface were established.

EXTRACTED‑POLE WAVEGUIDE FILTERS BASED ON CAPACITIVE IRISES

Mospan L. P., Senkevich S. L., Tkachenko V. I. 

25-39

A new design of directly coupled waveguide bandpass filter that provides extracted stopband poles is presented by the example of a capacitive iris filter. The attenuation poles are introduced by cutting in iris strips additional slots parallel to the wider waveguide wall. This way of extracted poles implementation does not require spatially developed elements (in particular overmoded ones). The K-inverter corresponding the modified iris changes slightly and may be easily fine-tuned. Additional slot dimensions determine the location and Q-factor of the attenuation poles, which may be placed in the parasitic passband or on a required skirt of the main one. Numerical examples for the three‑section filter in WR90 waveguide demonstrate the possibility to increase the skirt selectivity or to improve the stopband attenuation without any extension of the filter dimensions, keeping the same return loss within the passband.

THE ACCURATE TWO-DIMENSIONAL MODEL OF THE EFFECT OF THE SURFACE WAVES TRANSFORMATION INTO THE SPATIAL MODES

Kirilenko A. A., Steshenko S. A.

30-38

The accurate mathematical model of radiation of the natural electric modes of a planar dielectric waveguide on finite number of rectangular grooves cut off on the surface of the perfectly conductive screen has been built. Such structures are widely used in antennas of diffraction radiation. The cases of finite and zero gaps between the waveguide and the screen have been considered separately. The influence of the degree of connection on the diffraction characteristics of the antenna has been investigated.

SCATTERING MATRIX CALCULATION OF PLANE JUNCTION OF HOLLOW UNIFORM WAVEGUIDE OF ARBITRARY CROSS-SECTION

Don N. G.

39-44

The scheme of attack on the problem on plane junction of hollow uniform waveguides of arbitrary cross-section is presented. The contour integration is used in computation of coupling coefficients between the waveguide modes. The method is tested on example of the coaxial junction of two circular waveguides. The described method is a key element of solving of commoner problem on analysis of complicated waveguide devices.

THE MATHEMATICAL MODEL OF ELECTROMAGNETIC WAVE DIFFRACTION BY A RESISTIVE DISK

Balaban M. V. 

45-50

We consider the problem of diffraction of an arbitrary electromagnetic wave by a resistive disk. The mathematical model of this problem i.e. the set of coupled dual integral equations is built. This set is integrated and equivalently reduced to the pair of “canonical” dual integral equations which is equivalent to Fredholm second kind integral equations.

AXIALLY SYMMETRIC EIGEN MODES OF ELECTRICAL TYPE IN OPEN RESONATOR WITH SPHERICAL MIRRORS

Svishchov Yu. V. 

51-61

Mathematically strong model for axial-symmetric eigen modes of electrical type of open resonator with spherical mirrors is constructed. Under supposition of the spectrum existence, it is proved that the spectrum is discrete, of finite multiplicity, and with the only accumulation point on infinity. Theoretical analysis of spectral characteristics of the open resonator has been done for the case, when wavelength is comparable with the resonator dimensions. The scope of correctness of a few well-known asymptotic models of the resonator has been found.

EXPERIMENTAL INVESTIGATION OF HF SIGNAL VARIATION DURING SOLAR PROTON EVENTS

Goncharenko Yu. V., Gutnik V. G., Kivva F. V. 

62-69

The results of experimental receiving HF signal at frequency 3.6 GHz from telecommunication satellite on elevation angle 4.5° from April’2002-September’2003 are considered. It was found, that during strong solar flare deep rapid fading was appearing. The ionospheric and tropospheric parameters variation influence on telecommunication canal parameters was analyzed.

THE RECONSTRUCTION OF THE REFRACTIVE INDEX STRUCTURAL CHARACTERISTIC PROFILE BY FIELD CORRELATION FUNCTION

Alexeev G. A., Belobrova M. V. 

70-76

The analysis of the method of the spherical radiowave propagation inverse problem numerical solution is based on the conversion into the equation with self-adjoint operator with the following employment of the Bakushinsky’s regularization method is carried out. It is shown, that at optimum parameters regularization algorithm the method is capable of reconstructing the troposphere refractive index structural characteristic profile from the transversal spatial correlation function of amplitude fluctuations with high enough accuracy in the wide diapason of the turbulent, stochastically inhomogeneous troposphere states.

IMPROVEMENT OF BASIC SYNTHETIC APERTURE PATTERN CHARACTERISTICS BY COMPARISON METHOD

Glamazdin V. V., Lukin K. A., Skresanov V. N. 

77-84

We have been proposed the new signal processing method for a digital synthetic aperture radar azimuth compression. The method is based on the nonlinear logical comparison procedure of two synthetic aperture patterns. Patterns were formed from the same trajectory signal data by weighing with a help of appropriate antenna windows. Is was shown, that the synthetic aperture patterns comparison algorithm permit one to increase the azimuth resolution, to reduce side lobes and to expand the dynamic range of target detection in comparison with a convenient procedure using Dolf-Chebyshev antenna windows.

ANALYSIS SCHUMANN RESONANCE PARAMETERS VARIATIONS ASSOCIATED WITH SOLAR PROTON EVENTS

Shvets A. V., Nickolaenko A. P., Belyaev G. G., Schekotov A. Yu. 

85-97

Analysis of the three-component Schumann resonance (SR) records had been performed during the strongest solar proton events (SPE) from 2000 till 2003. We observed falling of the peak resonance frequencies reaching 0.5 Hz occurred in the electric component and magnetic component oriented in the east-west direction. The frequency fall was observed synchronously at two far points (Karelia and Kamchatka). The signal intensification reached 2- 4 times above the quiet period level by all the three field components was as a rule observed during SPEs. The main features are theoretically interpreted as occurring of the polar cap irregularities in the lower ionosphere.

EXPERIMENTAL IVESTIGATIONS OF PLANAR DIELECTRIC DISK ANTENNAS

Andrenko A. S., Ivanchenko I. V., Popenko N. A., Khruslov M. M. 

98-101

The results of experimental investigations of planar dielectric disk antennas with different dielectric substrates and radiated elements are presented. Geometric and electric parameters of antenna prototypes have been selected in accordance with the theoretical calculations [1] to provide the conditions of ТМ₀₁ mode excitation in the electromagnetic structure under study. It has been determined that the use of substrates with the different dielectric permittivity gives rise to the change in radiation patterns and field intensity in their lobes. Moreover, the use of dielectric disks with high permittivity (e_d =90) provides an increase of radiation power in the free space as well as the broadening of antenna bandwidth.

SPIN-FILTERING ELECTRON CURRENTS IN SEMIMAGNETIC SEMICONDUCTOR NANOSTRUCTURES

Beletskii N. N., Borysenko S. A. 

102-108

Spin-filtering electron currents has been studied in the nanostructures based on ZnMnSe-semimagnetic semiconductors. It is shown that the thicknesses of nanostructure layers and the Mn-concentrations in the layers can be chosen in such a way that the spin polarization of the electron current can reach very large values in relatively low external constant magnetic fields. It has been found that the degree and sign of the spin polarization of the electron current can be changed with the help of the bias voltage applied to the semimagnetic nanostructure. It has been determined that the change of sign of the spin polarization of the electron current is concerned with the resonance tunneling of spin-up electrons through the double-barrier energy potential formed in the nanostructure at the expense of choosing the composition of semimagnetic layers.

METHOD OF CALCULATION OF AVALANCHE P-N JUNCTION IN A REGIME OF AUTOOSCILLATION

Lukin K. A., Maksymov P. P. 

109-115

The numerical method of calculation of avalanche p-n junctions in a regime of autooscillation is proposed. The solution of system of the nonlinear equations of drift-diffusion model of junctions to found the finite-difference methods as grid functions on a non-stationary spatial grid. This solution satisfies to boundary conditions on mobile borders of depletion region and conditions of a continuity on border separation of  and regions. The results of calculation of density of charges, electrical field and electrical potential these of p-n junctions are given.

RESONANCE SCATTERING BY A SMALL PARTICLE ABOVE A PERFECTLY REFLECTING PERIODIC ROUGH SURFACE

Bass F. G., Mikhaylova D. V., Prosentsov V., Resnick L. 

116-122

The wave scattering by an arbitrarily shaped small particle located above a perfectly reflecting periodic rough surface is studied with the use of the local perturbation and integral equation methods. The total field propagating in the half-space above the surface has been calculated. The resonance frequencies of scattered fields are found for the case when the particle is spaced far apart from the surface.

THE BAND STRUCTURE ANALYSIS OF 1D AND 2D PHOTONIC CRYSTALS BY COUPLED WAVE METHOD

Fitio V. M., Bobitski Ya. V., Laba H. P. 

123-131

The electromagnetic field of wave that propagates in the crystal is expanded in plane waves in the classic method of computation of photonic crystal band structure. The task of finding of the allowed frequencies for a wave vector in the first Brillouin zone comes to the finding of eigenvalues and eigenvectors of the corresponding matrix of dimension, which provides the required precision for finding of the allowed frequencies. Due to slow convergence of expansion in plane waves it is necessary to solve the matrix equation of large dimension, that requires considerable time of computation. The proposed method of determination of the allowed frequencies is based on the coupled wave method (CWM) at the corresponding setting of initial periodic conditions. Especially, this method is simple for 1D photonic crystals, and it consists in the solution of eigenvalue problem of ТХ = r X type, and examination, whether absolute value of eigenvalue r is equal to one. The dimension of quadratic matrix T is 2 ´ 2. The eigenvalue problem of this type appears as a result of the application of so-called T-algorithm, which are stable for 1D photonic crystal. The solution leads to eigenvalue problem of ТХ = r RX type and examination, whether the absolute value of eigenvalue r is one at given frequency v and component k_x of wave vector for 2D photonic crystals, too. The eigenvalue problem of type of ТХ = r RX arises due to the application of stable numerical S-algorithm. Dimension of matrixes T and R is 2N ´ 2N, where N is a number of the coupled waves. Frequency will be allowed, if absolute value of eigenvalue is one. The dimension 2N ´ 2N of the matrix equation in the proposed method is equivalent to the dimension N ² ´ N ² of classic method from the point of view of computation precision. Stable S-algorithm of computation is developed. The computations of band structure of the simplest structures of 1D and 2D photonic crystal are conducted. The dependencies of computation precision on the number of the coupled waves (N changes from 1 to 29) are obtained.

INJECTION REGIME OF ANTI-CLOSED M-N CONTACT

Shekhovtsov N. A. 

132-138

The processes in the charge space region of anti-closed m-n contact are considered. These processes limit the injection current of anti-closed m-n contact. The processes that block up the decreasing of contact potential difference Uk to zero by direct voltage are considered too. The processes of current increasing through m-n contact after the decreasing Uk to minimum are investigated.

ON THE INFLUENCE OF IONS ON THE STATIC POTENTIAL DISTRIBUTION IN THE O-TYPE DEVICES WITH THE LONG-TIME INTERACTION

Alexeev G. A. 

139-142

The ion influence on the static potential distribution in the plane-parallel channel with a tape electronic beam was studied. Features of the natural ionic trap building are investigated depending on parameter of the electronic charge compensation, the ionic gas temperature, on the coefficient of filling of the channel by an electronic stream and the coefficient of asymmetry of his arrangement. Results can be used at designing of О-type devices with long-time interaction.

NONLINEAR DYNAMIC OF ELECTRONS IN THE ORBITRON TYPE SYSTEMS

Kirichenko Yu. V.

143-149

The nonlinear analysis of the energy exchange of the nonrelativistic electrons with the basic wave in the coaxial cavity is developed. The cavity is immersed in crossed radial-electrostatic and axial-magnetic fields. The method of increasing of the efficiency of the orbitron type system based oneself on the phase selection of electrons is proposed. Electrons with unfavourable phases remove from the space of interaction. The relationship for optimum electron wave and cavity parameters has been derived.

SUBMILLIMETER LASER WITH CONTINUOUS TUNING OF FREQUENCY OF RADIATION WITHIN THE LIMITS OF CUTOUT SIGNAL MULTIPLICATION

Radionov V. P. 

150-153

The laser of a submillimetric range is described. This laser is tuning on the given frequency within the limits of a tuning range. The tuning range is located in a strip of a spectral line of radiation of active substance. Measurements and adjustment will be carried out with the help of the micrometric mechanism of moving of a mirror. For tuning convenience the micrometric mechanism of mirror displacement is supplied with an additional moving scale graduated in MHz.

SIGNATURES OF MIKCOWAVE INFLUENCE ON VEGETATION SEEDS AND CORINEBACTERIUM

Kovalenko O. I., Kivva F. V., Kalinichenko S. V., Sukach L. A. 

154-163

During 2000-2003y. the theoretical and experimental investigations of peculiarity influence of microwaves on seeds of barley, sunflower, radish and corinebacterium: C.d.gravis tox +, C.d.gravis small tox +, C.d.mitis tox +, C.d.belfanti tox +, C.ulcerans tox + are carry out. Main influence was fulfill on frequency f₀ = 2450 ± 50 MHz, average power P_a = 10²-10³W, pulse power – 1 kW and relative pulse duration n = T/Τ_p = 1-10. In K and Q band used standard generators G4-141 and G4-142 when operated in discrete bands f = 37,5-78,33 GHz and average power P_a = 1-5 mW. It is shown that after microwave and warmth influence equal energy the biological processes in mentioned structures are different. Some possibilities of low power microwave modification the plant seed and bacterium biological activity are shown. It is necessary to note, that energy of growth the seed may be increasing after preliminary oppressed by warmth.

INFLUENCING OF FIELD PENETRATION DEPTH IN HIGH LOSSY LIQUID ON DISK QUASI-OPTICAL DIELECTRIC RESONATOR SPECTRAL CHARACTERISTICS

Lavrinovich A. A. 

164-168

The experimental results of highly lossy liquids influence on the disk “whispering gallery” quasi-optical dielectric resonator characteristics are presented. It was found for the first time that the capillary with the acetone has negative frequency shift with the change of the capillary diameter d like in case of the water. The frequency shift change of sign point was observed for an acetone at a larger values of d, in comparison with water, which caused by the larger field penetration depth in an acetone. The maximum values of capillary diameter suitable for investigations of highly lossy liquids were determined.

A TERAHERTZ QUASI-OPTICAL PHASE FREQUENCY CHANGER WITH THE CRYSTAL QUARTZ PHASE SECTIONS

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

169-172

A phase frequency changer (PFC) for quasi-optical transmission line with phase sections made of crystal quartz and polarizers executed on the basis of small-period wire gratings is considered. The PFC is intended for operation in terahertz (THz) frequency region. It was examined at the frequency f₀ = 0.89 ТHz. The influence of the differential phase shift deviation in the sections on the output signal spectrum and the influence of the sections mismatch on the reflection signal spectrum were considered. In the frequency region ± 10% f₀ the levels of the spurious spectral components of output signal are less than -40 dB with regard to the level of the useful component. The levels of all spectral components of the reflection signal are less than -70 dB with regard to the level of the useful component of the PFC output signal.