2010, volume 15, № 4
DIFFRACTION OF THREE-DIMENSIONAL GAUSSIAN BEAM WITH CIRCULAR SYMMETRY OF SPACE FIELD DISTRIBUTION ON PENETRABLE SCREENS
V. V. Yachin, T. L. Zinenko, V. K. Kiseliov
3-11
The problem of scattering of 3-D Gaussian beam incident at an arbitrary angle onto a double-periodic magneto-dielectric slab has been solved. The new formulas for incident and scattered 3-D Gaussian beam fields in the form of the single integrals have been derived. They allow to reduce the time spent upon the numerical calculations of the incident and scattered beam fields. The calculations of the obliquely incident 3-D Gaussian beam onto magneto-dielectric slab and reflected from it using derived formulas are illustrated in figures presented in the paper.
ANALYSIS OF EFFECT OF AZIMUTHAL DIELECTRIC INHOMOGENEITY ON MODE ATTENUATION IN HOLLOW DIELECTRIC AND DIELECTRIC-LINED WAVEGUIDES
A. I. Goroshko, V. K. Kiseliov
12-15
An effect of azimuthal dielectric
inhomogeneity upon the mode attenuation of the hollow dielectric waveguide has
been studied using the perturbation method. Estimation of the effect produced
by such ingomogeneities upon the mode attenuation in the hollow dielectric and
dielectric-lined waveguides has been performed. It is shown that the modes
attenuation in both of the waveguides is not critical to small-valued
inhomogeneities. The linearly polarized HE11 mode in both of
the waveguides is more sensitive to variation in dielectric permittivity in the
plane of vector 
polarization.
THE PERIODIC STRUCTURE ANALYSIS OF П- AND H-SHAPED SLOT RESONATORS IN MICROSTRIP LINE GROUND PLANE
Yu. V. Rassokhina, V. G. Krizhanovski
16-22
The scattering characteristics of P- and H-shaped slot resonators in microstrip line ground plane was calculated by transverse resonance technique. It was demonstrated that the microstrip line fundamental mode transfer coefficient of the periodic structure built on these resonators has a characteristic of a two-band rejection filter.
HEURISTIC MODEL OF MICROWAVE FIELD ABOVE SEA SURFACE FOR STRONG SHADING
V.B. Razskazovskyy, Yu.F. Logvinov
23-31
A propagation model is offered for description of the microwave field above the sea surface for low grazing angle and strong shading in area below than border of applicability of the tangent plate approaching. The dependence from distance of the reradiated field intensity and characteristic coherent and random components for the few variants of sea state and height of the transmitting and reception points is analyzed. It is shown that at the large grazing angle results of calculation by the offered method and with the use of tangent plate approaching coincides.
RESEARCH ON RADIOLOCATION OBSERVABILITY OF SURFACE OBJECTS IN THE AREAS OF THE WORLD OCEAN
I. P. Bezgina, I. M. Mytsenko, S. I. Khomenko
32-38
The results of experimental researches of radar range in centimetric range in the areas of the World Ocean are represented. The functions of reflected signals on range in over-the-horizon area at different conditions of radio wave propagation are investigated. A function of propagation factor V(r) on the direct signal array is determined simultaneously with radio-location observability. The calculation of ship scattering cross-section is determined and its function on over-the-horizon distance is represented.
INFLUENCE OF FLUCTUATIONS OF RADIOWAVE REFRACTION COEFFICIENT OF TROPOSPHERE ON RADIO INTERFEROMETER ACCURACY
D. D. Khalameyda
39-44
Influence of fluctuations in turbulent troposphere on accuracy of arrival angle measurement by interferometer for estimation of refraction properties of troposphere has been studied. Mathematical model of interferometer has been given. Characteristics of the interferometer have been obtained with the help of Monte-Carlo method. It has been shown that fluctuations of phase front of an incident wave on interferometer antennas allow obtaining sufficient accuracy of arrival angle measurement to calculate gradient of refraction coefficient in troposphere almost in case when troposphere is greatly turbulent (RMS of ∆N = 10 units).
ABOUT RELATIONSHIP OF EVAPORATION DUCT HEIGHT AND MICROWAVE ATTENUATION IN OVER HORIZON
Yu. V. Levadnyi, V. K. Ivanov, V. N. Shalyapin
45-50
The analysis of the experimental data was carried out to find relationship between evaporation duct height, defined on bulk meteorological measurements, and attenuation of centimeter radio-waves in over horizon. It was shown that evaporation duct height reduction for tree meters for small evaporation duct height, two meters for medium height and one meter for large height increase accuracy of diagnostics of microwave propagation. It was also confirmed that in tropical and subtropical areas of the Atlantic Ocean for low antenna height an evaporation duct is one of the major propagation mechanisms for three centimeter radio waves.
THZ SURFACE ELECTROMAGNETIC OSCILLATIONS IN PLASMA-LIKE MEDIA CONTAINING THE FLUXES OF CHARGED PARTICLES
S. I. Khankina, V. M. Yakovenko, I. V. Yakovenko
51-57
In a kinetic approximation an interaction between the charged particles and surface plasmons in a semiconductor-dielectric (vacuum) structure is considered. The impact of the potential barrier at the interface on this interaction is taken into account. An instability increment of surface plasmons is found. The existence of the potential barrier results in a decreased of increment.
3D MOTION OF ELECTRONS IN KLYNOTRON OSCILATOR CH. 2. REAL OSCILLATOR ANALYSES
M. V. Mil’cho
58-65
The electron movements in some real oscillators of the mm and sub-mm bands are investigated using the “Klynotron” computer program. This program was described in chapter 1. The computerized calculation results are analyzed. The prospects for using this program in the development of new oscillators are discussed.
USE OF THIRD-ORDER STATISTICS FOR RECOGNITION MOBILE GROUND RADAR OBJECTS BY MEANS OF TIME-FREQUENCY DISTRIBUTIONS OF BACKSCATTERED SIGNALS
А. V. Тоtsky, P. A. Molchanov, G. I. Khlopov, V. Ye. Morozov
66-73
A problem of recognition and classification of moving ground-based radar objects with informative features contained in the time-frequency distributions of non-stationary backscattered signals is considered. The results of experimental studies performed by homodyne continuous millimeter wavelengths radar are represented. A comparative analysis of automatic recognition of radar patterns for different methods of extraction the objects classification features and using different decision-making methods is carried out. The benefits of selection of the informative features by using bispectral estimation of temporal changes in the instantaneous Doppler frequencies in the observation are demonstrated.
WAVEGUIDE-DIELECTRIC RESONATOR OF THE MILLIMETER WAVE BAND
R. I. Belous, S .P. Martynyuk, A. P. Motornenko, I. G. Skuratovskiy
74-77
The particularities of the waveguide-dielectric resonator (WDR) at the millimeter wavelength band have been investigated. The computed dependences for the eigen frequencies and Q-factors for the Н111-mode in the WDR on the circular waveguide as a function of resonator parameters have been presented. The computed results have been compared with the experimental data.
REMOTE MEASUREMENT OF WATER DROP SIZES BY DOUBLE FREQUENCY SOUNDING
O. A. Voitovych, A. M. Linkova, G. I. Khlopov, S. I. Khomenko
78-84
The analysis of possibilities of double frequency method for measurement of water drop size is described by using radar sounding at wavelengths 8 mm and 3.2 cm. The results of theoretical study of the method performed for case of mono-disperse medium are presented and results of experimental measurements of drop size by means of radar and contact methods are also given.
AUTODYNE MILLIMETER BAND SURVEILLANCE RADAR
G. P. Ermak, A. V. Varavin, A. S. Vasilev, I. V. Popov, A. P. Evdokimov,
| V. V. Kryzanovsky |
85-91
The research results of short-range surveillance radar designed on the basis of Ka- band FMCW autodyne transceiver with scanning antenna of diffraction radiation are presented. All the functions of forming and spectral signal processing and controlling the scanning of antenna beam were carried out by means of digital signal processor. The transmission of control commands and signals from radar was carried out through radio channel IEEE 802.11b.