Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
61
2-6
2004
Issue 2
0
Space-Time Characteristics of Illuminated Sea Surface Areas Observed at Narrow Grazing Angles
93-103
10.1615/TelecomRadEng.v61.i2.10
V. F.
Kirichenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
Yu. F.
Logvinov
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy
of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
Space-time characteristics of illuminated sea surface areas have been obtained by computer simulation. The case of backscattering at narrow grazing angles was studied. Comparison shows a good agreement of simulation results with experimental data.
Intensity of Choppy Sea Radar Backscattering for Small Grazing Angles
104-115
10.1615/TelecomRadEng.v61.i2.20
V. G.
Gutnik
2Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 4 Mystetstv St.,
Kharkiv 61002, Ukraine
G. P.
Kulemin
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085
L. I.
Sharapov
Institute of Radio Astronomy, National Academy of Sciences of Ukraine 4, Krasnoznamennaya St., Kharkov 61002, Ukraine
E. A.
Goroshko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
An analysis of models of sea radio wave backscattering over the frequency range of 1÷150 GHz has been carried out. The dependences of the normalized radar cross-section on the grazing angle and wind velocity have been considered. The influence of drop-spray fraction on the total radar cross-section and scattered signal fluctuations has been analyzed for the millimeter wave band.
Estimating Cloud and Rain Parameters from Doppler Radar Data
116-124
10.1615/TelecomRadEng.v61.i2.30
Dmitry M.
Vavriv
Institute of Radio Astronomy, National Academy of Sciences of Ukraine 4, Krasnoznamennaya St., Kharkiv 61002, Ukraine
G.
Peters
Meteorological Institute, University Hamburg, Bundesstrasse 55,D 20146 Hamburg, Germany
O. O.
Bezvesilniy
Institute of Radio Astronomy, National Academy of Sciences of Ukraine
Real-time mapping of the parameters of precipitating water clouds and rain using a vertically-directed Doppler radar is an important problem. In this paper, an algorithm based on an independent estimation of the droplet effective diameter and concentration is suggested. This approach differs from the Marshall-Palmer retrieval procedure that is based on a single estimated parameter, the radar reflectivity factor. It is shown that the Marshall-Palmer approach can provide good estimates of the averaged parameters, however is not suitable for producing the high resolution time-height maps of the parameters. The two-parameter retrieval algorithm under discussion was tested using the data obtained with the 36 GHz polarimetric Doppler cloud radar MIRA-36. The measurements data and their processing are presented. The suggested algorithm is applicable to real-time measurements with the vertically-directed Doppler radars.
Estimation of Signal Parameters Scattered by an Acoustic Wave Packet
125-129
10.1615/TelecomRadEng.v61.i2.40
V. M.
Kartashov
Kharkov National University of Radio Engineering and Electronics, 14, Nauka Ave, Kharkiv, 61166, Ukraine
Singularities of algorithms for estimating parameters of the radio signal received in the systems of radio acoustic atmosphere sounding are considered. Determination of the atmosphere characteristics are carried out in accordance with the measurement results.
Algorithm for Detection and Identification of Low Doppler Target
130-140
10.1615/TelecomRadEng.v61.i2.50
Oleg
Sytnik
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
The method of detection and identification of a low Doppler target under conditions of intensive disturbances having fluctuating character is investigated in this article. The proposed algorithm for calculating the estimations of the target spatial position and the Doppler frequency translation of a signal reflected from the target is an optimum from the standpoint of the maximum of likehood. The algorithm was based on the principle of the combined processing of signals from spaced sensors in order to obtain the optimum estimations of signal parameters. The analysis is carried out both in the spectral and in the time domains which makes it possible to extract a maximum amount of information about the object under investigation with disturbances of different character and level. The results of the algorithm modeling are presented, the characteristic features of its performance in actual practice are discussed.
Mathematical Simulation of the Bearing Process in the Near Zone of a Complex Extended Object
141-149
10.1615/TelecomRadEng.v61.i2.60
N. V.
Barkhudaryan
Kharkov Military University, 6, Svoboda Sq., Kharkov, 61043, Ukraine
S. E.
Vazhinsky
Kharkov Military University, 6, Svoboda Sq., Kharkov, 61043, Ukraine
V. A.
Vasilets
Kharkov Military University, 6, Svoboda Sq., Kharkov, 61043, Ukraine
A. Z.
Sazonov
Military Scientific Centre, 6, Svoboda Sq., Kharkov, 61043, Ukraine
Oleg ll'ich
Sukharevsky
Military Scientific Centre, 6, Svoboda Sq., Kharkov, 61043, Ukraine
The methods which makes possible to calculate errors in taking bearing to an aerodynamic object of a complex shape are presented. The direction finder is located in a near zone of a scatterer. It is shown that the errors have been mainly caused by distortions in the amplitude-phase distribution of a field in the receiving antenna aperture. As the distance to an object decreases, angular deviations increase and may become considerable. The results of calculations of amplitude-phase distributions of the field in the aperture and the corresponding bearing errors for an airplane with a maximum cross size of 20 meters are represented.
Statistics of Signals of the HF Doppler Radar Sensing the Bottomside Ionosphere Disturbed by Rocket Launches and Solar Terminator
150-177
10.1615/TelecomRadEng.v61.i2.70
V. P.
Burmaka
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077, Ukraine
L. S.
Kostrov
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077, Ukraine
The statistical analysis of the variations in the Doppler spectra resulting from forty-three rocket launches has revealed four groups of apparent velocities of disturbance transfer: 0.5÷0.8, 1÷6, 7÷9, and 15÷20 km/sec. They are related to acoustic-gravity, slow magnetohydrodynamic, magnetogradient, and possibly gyrotropic waves.
The analysis of thirty-one events of the moving solar terminator has made it possible to obtain the statistics of the Doppler spectra variations (variations in the mean Doppler shift of frequency, duration of ionospheric response, predominant time period, and the amplitude of the central frequency of quasi-periodic disturbance).
Method of Calculation of Electromagnetic Radiation Power Absorbed by a Human Body during Operation of Subscriber Offices
178-182
10.1615/TelecomRadEng.v61.i2.80
L. I.
Netikova
Kharkov National University of Radio Engineering and Electronics, 14, Lenin Ave, Kharkov, 61166, Ukraine
Simulation of the field of a subcriper office in the immediate to a user's head is considered by means of FDTD (Finite-Difference Time-Domain) method.
Issue 3
0
Statistical Characteristics of Terrestrial Electromagnetic Field Fluctuations
183-205
10.1615/TelecomRadEng.v61.i3.10
K. P.
Garmash
V. Karazin National University of Kharkov
S. G.
Leus
V. Karazin National University of Kharkiv
S. A.
Pazura
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
S. N.
Pokhil'ko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
Magnetometric complex of Kharkov National University has been described briefly. Principal statistical characteristics of variations of H - and D -components of the geomagnetic field in 1999 (duration of the observations was 1488 hours) have been calculated. It has been shown that at averaging on the time interval no less than 10 min statistical distributions of signal amplitudes differ noticeably
from normal law. Temporal variations of the sampling root-mean-square deviations σH and σD reflect the nature of processes in the geospace (a level of geomagnetic and solar activity, diurnal variations etc.). Spectral and wavelet analysis has confirmed that variations of magnetometric signals H(t) and D(t) besides general information on variations of space weather contain also information on more "subtle" processes in the geospace (amplitude value, pulsation period, pulsation duration etc.).
Applicability of the Isotropic Approximation in the Problem of Frequency-and-Angular Ionospheric Sounding
206-214
10.1615/TelecomRadEng.v61.i3.20
Vladimir G.
Galushko
Institute of Radio Astronomy, National Academy of Sciences of Ukraine
G. V.
Lytvynenko
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 4, Krasnoznamennaya St., Kharkov 61002, Ukraine
The paper considers the effect of the geometric field on the accuracy of recovering vertical profiles of the ionospheric electron density by the method of frequency-and-angular sounding. The validity of the isotropic approximation in the problem of frequency-and-angular sounding of the ionosphere (FASI) is analyzed in dependence on the propagation path length and its orientation with respect to the geomagnetic field vector. Recommendations are given as for employing frequency-and-angular dependences for the ordinary and extraordinary magnetoionic components when recovering ionospheric electron density profiles by the FASI technique within the isotropic approximation. The results obtained are validated through numerical calculations for real measured data.
Methods for Remote Sensing of Ionosphere Disturbances in a Strong Mesospheric Electric Field
215-227
10.1615/TelecomRadEng.v61.i3.30
S. I.
Martynenko
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077, Ukraine
The approved technique for simultaneous remote sensing of a strong mesospheric electric field (SMEF) intensity and the appearing disturbances of the basic D-region parameters is proposed. The above procedure is based upon the recorded data on the MF radio signals partially reflected from the ionosphere. The model representation of the SMEF source as a current power supply has been used. As an example, we refer to: the height-related profiles of SMEF intensity, the disturbances of effective collision frequency and electron density, relative disturbances of electron temperature, effective electron attachment rate, effective electron-ion recombination coefficient, electron energy loss coefficient per a single collision with a heavy particle, low-frequency plasma conductivity concentrations of positive and negative ions in the lower part of the D-region. The total error in determining the afore-mentioned parameters has been estimated.
Earth's Magnetic Field Fluctuations during the Severe 1999 Geospace Storm
228-242
10.1615/TelecomRadEng.v61.i3.40
K. P.
Garmash
V. Karazin National University of Kharkov
S. V.
Lazorenko
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077, Ukraine
S. A.
Pazura
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
Using the high-sensitivity fluxmeter magnetometer located in Kharkov V. Karazin National University Radiophysical Observatory (RPO) the unique magnetic storm and the preceding solar flare effects were observed with high temporal resolution. During the storm the magnetometer signals were increased by a factor of up to 50÷60 times and a significant enrichment in their spectra was observed. The data processing was performed by applying statistical, spectral and wavelet analyses. The specifics of the geomagnetic field fluctuations are described.
Theoretical Model and Experimental Observation of Resonance Generation of Free Electron Laser
243-255
10.1615/TelecomRadEng.v61.i3.50
B. P.
Yefimov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
K. V.
Ilyenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
T. Yu.
Yatsenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
V. A.
Goryashko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura Str., Kharkiv, 61085, Ukraine
A breadboard model is created of free electron laser with homogeneous guiding magnetic field. A theoretical model allowing to explain a number of properties of such device is suggested. It is demonstrated that a resonance amplification of signal power in the range of nonrelativistic and slightly relativistic energies of electrons is in principle possible. Resonance generation conditions connecting initial velocity of electrons with homogeneous guiding magnetic field value are analytically obtained. Comparison of calculation results with results of numerical simulation of electron trajectories has shown a satisfactory fir. Preliminary results are presented of experimental investigations, and a number of resonances in total radiation power predicted by theory are revealed.
Periodic Oscillating Modes in Single-Mode Solid-State Lasers
256-271
10.1615/TelecomRadEng.v61.i3.60
G. P.
Kovalenko
Sumy National Agrarian University, 160, Kirov St., Sumy, 40021, Ukraine
S. V.
Kolomiets
Sumy National Agrarian University, 160, Kirov St., Sumy, 40021, Ukraine
The dynamics of a semiclassical model of a single-mode solid-state laser is studied by the bifurcation method of a cycle initiation. The bifurcation analysis has been carried out for quadratic, cubical and biquadratic dependencies of a Q-switch on the intensity of a photon field. The stability criteria of periodic oscillations which occur as a result of the Hopf bifurcation have been obtained. The intervals of stability for controlling parameters of a Q-switch have been determined.
Issue 4
0
Numerical Analysis of a Dielectric Disk Antenna
273-284
10.1615/TelecomRadEng.v61.i4.10
Alexander I.
Nosich
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085
N. Yu.
Bliznyuk
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
In this paper, we consider the problem of numerical modeling of characteristics of a dielectric disk antenna excited by a vertical electric dipole. The problem is solved by using the method of regularization combined with the Galerkin method that enables us to obtain an infinite block-type set of the Fredholm linear algebraic equations of the second kind. The following characteristics of the antenna in the far field zone are obtained for various material and electric parameters: radiation pattern, space and surface wave powers, the absorbed power, efficiency, gain and directivity.
Radiation Characteristics of a Slot Antenna in a Hemispherical Bulge above a Perfectly Conducting Screen
285-291
10.1615/TelecomRadEng.v61.i4.20
Yu. M.
Penkin
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022,
Ukraine
R. I.
Klimovich
National Pharmaceutics University of Kharkov 47, Pushkinskaya St., Kharkov, 61002, Ukraine
Using Green's function approach, the radiation field of a circular slot in a hemispherical bulge extending above a plane infinite screen, both perfectly conducting, have been determined in the case of axially symmetric excitation. The conductivity and the directivity of the radiation are numerically studied with respect to changing geometrical parameters of the slot antenna.
Millimeter-Wave Radars for Environmental Studies
292-313
10.1615/TelecomRadEng.v61.i4.30
Dmitry M.
Vavriv
Institute of Radio Astronomy, National Academy of Sciences of Ukraine 4, Krasnoznamennaya St., Kharkiv 61002, Ukraine
V. A.
Volkov
Institute of Radio Astronomy, National Academy of Sciences of Ukraine 4, Krasnoznamennaya St., Kharkov 61002, Ukraine
V. N.
Bormotov
Institute of Radio Astronomy, National Academy of Sciences of Ukraine 4, Krasnoznamennaya St., Kharkov 61002, Ukraine
V. V.
Vynogradov
Institute of Radio Astronomy, National Academy of Sciences of Ukraine 4, Krasnoznamennaya St., Kharkov 61002, Ukraine
R. V.
Kozhyn
Institute of Radio Astronomy, National Academy of Sciences of Ukraine 4, Krasnoznamennaya St., Kharkov 61002, Ukraine
B. V.
Trush
Institute of Radio Astronomy, National Academy of Sciences of Ukraine 4, Krasnoznamennaya St., Kharkov 61002, Ukraine
A. A.
Belikov
Institute of Radio Astronomy, National Academy of Sciences of Ukraine 4, Krasnoznamennaya St., Kharkov 61002, Ukraine
V. Ye.
Semenyuta
Institute of Radio Astronomy, National Academy of Sciences of Ukraine 4, Krasnoznamennaya St., Kharkov 61002, Ukraine
An outline is given of recent scientific activities at the Institute of Radio Astronomy of the National Academy of Sciences of Ukraine for the development of millimeter-wave radars. The radars constructed include cloud radars and a side-looking airborne radar system. They are capable of performing real-time, high-resolution measurements over the frequency bands of 36 and 95 GHz. The set-up of these instruments, the novel technical solutions, and the signal processing technique introduced are discussed. The results obtained with such instruments during measurement campaigns are presented as well.
Conditions of "False" Reflection Appearing during Numerical Simulation of Video Pulse Scattering by Layered Dielectric Structures
314-327
10.1615/TelecomRadEng.v61.i4.40
A. O.
Puzanov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
The conditions of "false" reflections appearing during simulation of nonstationary electromagnetic wave scattering by multilayer dielectric structures have been investigated. The method of correcting the frequency dependences of electric characteristics of dielectric mediums at a limited frequency interval has been suggested.
Theory of Cylindrical Transmission-Type TE01p-Cavity Resonator with Metallodielectric Filling
328-343
10.1615/TelecomRadEng.v61.i4.50
V. B.
Kazansky
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077, Ukraine
Properties are investigated of transmission-type piecewise-homogeneous axially-symmetrical TE01p-cavity with the dense grating consisting of conducting rings.
Dispersion equation, equation for determining of generalized transmission matrix and complex eigenfrequencies are obtained from rigorous and equivalent boundary condition. Estimation of dissipative and radiation loss is made based on energy relations with the use of perturbation theory. It is shown that, in the absence of the effect of field concentration in the small-radius central rod, the insertion of an annular grating into peripheral region increases the Q-factor of the cavity. A relationship is established among the resonant frequency, the Q-factor, and the permittivity of the central rod. Taking into account of the coupling between the cavity and feeding waveguides, as well as the raised Q-factor of the cavity, lead to the reduced technological and methodical errors of the permittivity measurement as compared with the model of an isolated cavity without the annular grating. It seems promising to use this structure for the dielectric spectroscopy of high-loss substances (water solutions of biomolecules) as well as a mode and frequency selector, a base element of multisection filters, discriminators, phase shifting systems and so on.
Application of Conformal Mapping Theory to the Problem Solution of the Diffraction by a Rectangular Dielectric Cylinder
344-355
10.1615/TelecomRadEng.v61.i4.60
L. N.
Ilyashenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
The problem of electromagnetic wave diffraction by a rectangular dielectric cylinder is considered. The system of the Fredholm singular integral equations of the first kind appears from the field representation in terms of single-layer potential. Once the singular part of the integral operator kernel is developed and analytically inverted, the problem reduces to the infinite system of the Fredholm linear algebraic equations of the second kind which is numerically solved to any preassigned accuracy by the Galerkin's method with the basis elements as orthogonal eigenfunctions of the singular part of the integral operator. The conformal mapping between the rectangle and circle exteriors is performed, and the resulting parametric equations allow to reduce the initial diffraction problem to that of a circular dielectric cylinder. The calculation results are presented for variously sized rectangular cylinders under either E- or H-wave illumination at various angles.
Wispering-Gallery Modes of the Hemispheric Dielectric Resonator Immersed in Water
356-363
10.1615/TelecomRadEng.v61.i4.70
A. Ya.
Kirichenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085
I. G.
Maksimchuk
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
V. V.
Kutuzov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
G. V.
Golubnichaya
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
A. Ye.
Kogut
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085
V. A.
Solodovnik
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
The dynamics of changing a microwave signal traveling through a hemispheric dielectric resonator (ε1) immersed in liquid with ε > ε1 has been investigated. It has been found that H- modes of the resonator attenuate more weakly than E- modes at the same depth of immersion. This fact may be explained by different field distributions for those oscillations over the resonator surface. It is pointed out the possibility for application of the H-oscillation modes to study electric properties of liquids with large values of ε and tan δ.
Issue 5
0
Structure Functions of Electromagnetic Field Coupling in a Cavity Filled by Resonance-Size Magnetodielectric Spheres
363-381
10.1615/TelecomRadEng.v61.i5.10
A. I.
Kozar
Kharkiv National University of Radio Engineering and Electronics, 1, Nauka Ave,
Kharkiv, 61166, Ukraine
A technique is suggested to effectively construct the structure functions of electromagnetic fields in a cavity filled by resonance-size magnetodielectric spheres. Expressions have been derived for the tensorial functions representing electromagnetic interactions of the magnetic and electric type in the cavity with spheres. The expressions obtained for the structure functions have been given a theoretical analysis.
The Diffraction Problem in Periodic Solutions
382-393
10.1615/TelecomRadEng.v61.i5.20
V. A.
Shcherbina
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077, Ukraine
A pseudodifferential boundary equation has been constructed in the ℜ2 space to describe electromagnetic eigenwaves of a periodic corrugated waveguide.
The Conformal Mapping Method for Analysis of High-Frequency Electro-Magnetic Fields in Slow-Wave Structures 1. The Case of Large Slow-Downs
394-416
10.1615/TelecomRadEng.v61.i5.30
M. V.
Mil'cho
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
A numerical-analytical method for the analysis of spatial distribution of high-frequency fields of eigen oscillation modes in slow-wave structures composed of metal rectangular elements is described. Gratings, combs and other similar constructions are such systems. The field distribution for a particular slow-wave structure is represented in the form of a linear combination of solutions to several problems of wave diffraction on a periodical structure composed of finite-thickness half-planes. The solution to these auxiliary diffraction problems is found from the requirements of identity of the combined functional equations obtained at the joining of the fields for the electrodynamic and electrostatic instances. An exact solution to electrostatic problems is found by means of the conformal mapping method. The formulae for calculating the electrodynamic fields are represented in a closed form (not in the forms of series). All spatial harmonics of the field are taken into account. The field peculiarities near the sharp edges of the metal elements are described correctly. In the first part of the paper a large slow-down is considered in the case when the wave lengths of all spatial harmonics are much less than the free-space wavelengths. Plots of space-time field variations are represented for a comb slow-wave structure.
Electrostatic Potential Distribution in Eccentric Cylindrical Channel with Tubular Electron Beam
417-423
10.1615/TelecomRadEng.v61.i5.40
L. V.
Stulova
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
G. A.
Alexeev
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
Analysis of electrostatic potential distribution over the cross section of the equipotential cylindrical channel containing a tubular electronic beam is carried out, with both coaxial and non-coaxial layout of the outer and inner electrodes. It is shown that a smooth variation of the channel width does not allow to form any effective ("narrow" and "deep") natural ionic trap in azimuth direction with small loss of the beam current.
Radio-Frequency Radiation Induced by Transverse Current of Charged Particles of Extensive Air Shower
424-433
10.1615/TelecomRadEng.v61.i5.50
A. D.
Filonenko
V. Dal Eastern Ukrainian National University 20a, block Molodiezhny, Lugansk, 91034, Ukraine
Un investigated before mechanism of the electromagnetic pulse generation caused by break of a quasi-stationary transverse current of electrons in extensive air shower is considered. Some characteristics of the radiation field which are important in the consideration of method of radio detection of showers are investigated.
Middle Latitude Ionospheric D-Region Responses to Distant Launchings and Flights of Space Vehicles Investigated Experimentally by Means of a Partial Reflection Technique
434-450
10.1615/TelecomRadEng.v61.i5.60
O. F.
Tyrnov
V. Karazin Kharkiv National University, 4, Svobody Sq., Kharkiv 61022, Ukraine
A. M.
Gokov
S. Kuznets Kharkiv National University of Economics, Ministry of Education and Science of Ukraine, 9a, Nauka Ave., Kharkiv 61166, Ukraine; V. Karazin Kharkiv National University, 4, Svobody Sq., Kharkiv 61022, Ukraine
Possible changes in the electron density, N, in the middle latitude ionospheric D-region were investigated experimentally by a partial reflection technique over periods of launchings and flights of the variously typed rockets for different distances from launching sites. Rockets of medium and great powers were found to be able to produce short-time pulsed disturbances in the lower ionosphere electron density over distances up to several thousands of kilometers. It seems likely that these effects have been caused by stimulated pulsed electron flows coming from the magnetosphere into the lower ionosphere of the Earth, with their energy of ∼ 102 − 10 KeV and flux density values of p ∼ 108 − 109m2s−1.
Issue 6
0
Broadband Matching of the Rectangular Waveguide to a Transverse Dielectric Insert
451-462
10.1615/TelecomRadEng.v61.i6.10
V. V.
Shcherbak
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085, Ukraine
The problem of matching the rectangular waveguide to a thin dielectric layer over a wide frequency range is treated with the aim of optimizing vacuum windows of microwave devices. The effect of wave scattering by such a layer (with the irregularities introduced to compensate for its reactance) is analyzed in a rigorous formulation. The matching efficiency is compared for a variety of compensating elements, including strip- and step-like, with longitudinal and transverse symmetry, etc. The effect of imperfections is analyzed.
Electromagnetic Wave Diffraction by Two-Periodic Grating of Continuous Curvilinear Metal Strips
463-475
10.1615/TelecomRadEng.v61.i6.20
P. L.
Mladyonov
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 4, Krasnoznamennaya St., Kharkov 61002, Ukraine
Diffraction characteristics of a periodic grating consisting of strips in a shape of rounded meander, wavy- or saw-shape lines are investigated using the method of moments. The analysis of the total resonant reflection and transmission for the linearly polarized incident normally plane electromagnetic wave is performed for the single mode. The comparison of reflection properties of two-periodic gratings with the classical plane grating of straight-line strips is presented.
Quasi-Optical Resonance System for Solid-State Oscillator
476-484
10.1615/TelecomRadEng.v61.i6.30
A. V.
Arkhipov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
O. I.
Bilous
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
A. S.
Tishchenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
The Conformal Mapping Method for Analysis of High-Frequency Electro-Magnetic Fields in Slow-Wave Structures 2. Electrodynamic Solutions Being Equivalent to Electrostatic Ones
485-501
10.1615/TelecomRadEng.v61.i6.40
M. V.
Mil'cho
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
It is the second part of the series containing three papers. An auxiliary exact electrodynamic solution is obtained for an open comb. This solution is a result of incidence of a set of waves on the comb surface both from the free space and on the inside of slotted waveguides. The electrical field of this solution is expressed to be with a high accuracy in terms of the quasi-static solution obtained in the first part of the series of papers. So-called higher auxiliary solutions which correspond to the case of equal potentials on the open comb plates are considered. The solutions for specific slow-wave structures can be found in the form of the linear combination of all these auxiliary solutions.
Flight-Path Analysis of Moving a Charged Particle at a Special Form of the Anode Voltage
502-508
10.1615/TelecomRadEng.v61.i6.50
M. A.
Kopot
Kharkov National University of Radio Engineering and Electronics, 14, Lenin Ave, Kharkov, 61166, Ukraine
A. N.
Nikitenko
Kharkov National University of Radio Engineering and Electronics, 14, Lenin Ave, Kharkov, 61166, Ukraine
By using the flight-path analysis in a single-particle approach, the possibility of secondary electron emission in the cold-cathode magnetron devices has been investigated theoretically. In dependence on the pulse form of the anode voltage, the energy of initial electrons can be received, which is enough for an avalanche formation of secondary electrons.
Control System of the Meteorological Complex for Atmosphere Remote Sensing
509-516
10.1615/TelecomRadEng.v61.i6.60
Dmitry M.
Vavriv
Institute of Radio Astronomy, National Academy of Sciences of Ukraine 4, Krasnoznamennaya St., Kharkiv 61002, Ukraine
V. V.
Vinogradov
Institute of Radio Astronomy, National Academy of Sciences of Ukraine
S.A.
Razbejko
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 4, Krasnoznamennaya St., Kharkov 61002, Ukraine
The control system of a millimeter-wave meteorological complex for atmosphere remote sensing is developed. The system can comprise single radar or a set of such radars. Peculiarities of the algorithms for signal processing, data flow management and methods of data transfer to users are considered.
Experimental Study of Informative Indications of Echo-Signals from Surface Targets
517-528
10.1615/TelecomRadEng.v61.i6.70
Stanislav I.
Khomenko
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
The paper presents the results of experimental studies on spectral characteristics of echo signals from surface targets. It has been established, that under effect of ship maneuvering and propulsion system operation the sea surface is disturbed.
Impedance Characteristics of Diodes Operating Jointly and Having Negative Differential Conductivity
529-542
10.1615/TelecomRadEng.v61.i6.80
E. D.
Prokhorov
V. Karazin National University of Kharkiv, 4, Svoboda Sq., Kharkiv, 61077, Ukraine
O. V.
Botsula
V. Karazin National University of Kharkiv, 4, Svoboda Sq., Kharkiv, 61022, Ukraine
Impedance characteristics of diodes operating jointly and having negative differential conductivity have been analyzed in a wide frequency band. It has been shown that each group of diodes with negative differential conductivity has its own frequency band in which these diodes can operate jointly at the same frequency. The group of resonant-tunneling diode InGaAs/AIAs containing a diode with a limited volume charge storage operates at frequencies 50-100 GHz, and groups of a tunneling diode containing Gunn diode operate at frequencies 25-40 GHz.