Begell House
Telecommunications and Radio Engineering
Telecommunications and Radio Engineering
0040-2508
54
2
2000
Electromagnetic Wave Scattering by a Superconducting Sphere Located Near a Flat Interface of Two Media
This article addresses for the first time the solution of the vector boundary value problem on the scattering of a plane arbitrarily polarized electromagnetic wave, propagating at an arbitrary angle to the interface of absorbing media, on a superconducting sphere. Convenient equations are obtained for calculating the main electrodynamic characteristics of the superconductive sphere.
Victor Filippovich
Kravchenko
Kotel'nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences
Victor Tikhonovich
Erofeenko
Bellorussian State Univercity, Bellorussia
Anatolii Vasilievich
Moshinskii
Belarussion Engeneering Academy
1-8
Integral Transforms of Wave Processes and Their Spectral-Correlation Characteristics
Integral transforms are proposed for solving a wide class of physical and radio electronic problems. These transforms are the generalizations of the Fourier, Laplace, and Fresnel transforms, which are applied to the spectral analysis of broadband wave processes of different nature in optical, thermal, nuclear, ecological spectrometric, radio astronomical, and other systems. Theorems on the relation between the correlation and spectral characteristics of the transforms proposed are formulated.
Valerii Konstantinovich
Volosyuk
National Aerospace University "Kharkov Aviation Institute", Kharkiv, Ukraine
9-19
Radiation of Electrical Vibrator in Anisotropic Plasma
The problem of finding the radiation fields of a symmetrical linear vibrator, arbitrarily oriented in an uniaxial anisotropic medium, is solved by the method of integral electrodynamics equations. Simple analytical expressions are obtained for the radiation fields and the energy flux density.
Nikolai Antonovich
Khizhnyak
V. Karazin National University of Kharkov, Ukraine
Evgenii Alekseevich
Yatsenko
Department of Applied Electrodynamics, Radiophysical Faculty, Kharkov State University
20-28
Investigation of the Applicability of PM Noiselike Signals in SARs with Ambiguous Distance Reading
The possibility of separation of the useful part of a surface image against the background of noise is investigated where the noise is associated with the presence of the sidelobes of the autocorrelated function (ACF) of a phase-manipulated noiselike signal.
Vladimir Yakovievich
Bezlyud'ko
Kharkov Research Institute of Radio Measurements, Ukraine
Valerii Konstantinovich
Volosyuk
National Aerospace University "Kharkov Aviation Institute", Kharkiv, Ukraine
Andrei Viktorovich
Sokol'nikov
Kharkov Aviation Institute, Ukraine
Savelii Eremeevich
Fal'kovich
29-35
Applicability of Two-layer Surface Electrodynamic Model for Inverse Problems in Passive Remote Sensing
The solution of inverse problems in passive remote sensing was discussed in a large number of publications [1-6]. However, most of these papers contain no strict mathematical analysis of the applicability of various surface models from the standpoint of credibility of the parameter estimates obtained. The only exception is [7], where, within the framework of the proposed general theory of optimal parameter estimation for arbitrary surfaces, a method for evaluating the potential accuracy of estimates is discussed. In accordance with this method, the potential errors (variances or RMS values) are evaluated as the diagonal elements of the inverse to the Fisher information matrix [8]. This accuracy analysis makes it possible to select the observation conditions at which the expected errors are RMS smallest. This method was applied in [9] to the optimization of the sensing conditions for a flat uniform surface. In the present paper, the method is extended to the case of a two-layer flat uniform surface.
Vitalii Rudol'fovich
Tilinskii
Kharkov Aviation Institute, Ukraine
36-44
Nonortogonal Bases in Polarization Measurements: the Standard Polarization Sphere
The problem of polarization measurements in nonorthogonal bases is discussed. The concept of a "standard" polarization sphere is introduced, which allows one to unify the problem for arbitrary polarizations.
Kazimir Sergeevich
Shcheglov
Department of the TsNII "Kometa", Russia
45-58
Asymptotic Estimation of the Diffraction Loss in a Cassegrain Double-Reflector Antenna for a Low Level of Irradiation of the Subreflector Edge
Asymptotic formulas for the diffraction loss in axially symmetric Cassegrain double-reflector antennas with classical or modified reflector edges are obtained with the allowance for the effect of diffraction by the subreflector. The analytical expressions are derived on the basis of a formally rigorous uniform asymptotic vector representation of the electromagnetic field reflected by a curvilinear edge of the subreflector. Since several asymptotic terms are taken into account, the obtained formulas enable one to estimate the diffraction loss for a low level of Irradiation of the edge. The influence of the pattern on the form of the subreflector edge is studied. The formulas are derived with the help of computer algebra software.
Boris Lazarevitch
Kogan
Experimental Design Bureau of Moscow Energy Institute, Russia
59-69
The Problems of Constructive Synthesis of Reflector Arrays
The stages of solving the problem of constructive synthesis as applied to a generalized model of a reflector array are considered. Computer algorithms for the calculation of currents from the patterns and for the synthesis of not scattering beam-forming structures are proposed. On the example of a strlpllne array, the application of a rigorous model to the design of radiators of reflector arrays Is demonstrated.
Viktor Aleksandrovich
Obukhovets
Radio Engineering Department of the Taganrog State University of Radio Engineering, Russia
70-81
Constructive Synthesis of Dispersive Oscillation Systems of Quasi-Optical Solid-State Millimeter-Wave Sources
Oscillation systems and characteristics of quasi-optical single diode Gunn- or IMPATT-oscillators with echelette and corner-echelette open resonators (ORs) are described. The matching of impedances of the oscillation system and a nonlinear element is accomplished by introducing low Q resonators or a step transformer. Fixed-frequency oscillators are implemented in the 27−115 GHz frequency band. The noise level is at most 80−120dB/Hz for a 10−kHz detuning from the carrier frequency.
Anatoly Ivanovich
Fisun
A.Ya. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
82-91
A Nanosecond Pulse-compression Microwave Radar
Some characteristic features of high-power ultra-short microwave pulses produced by accumulating and rapid extraction of electromagnetic energy from cavities are examined. Results of the first experimental investigations of a breadboard nanosecond radar are presented.
Yurii Georgievich
Yushkov
Research Institute of Nuclear Physics at Tomsk Potytechnical University (TPU), Russia
Nikolai Nikolaevich
Badulin
Tomsk State Academy of Control Systems and Radioelectronics, Russia
Alexandr Panteleevich
Batsula
Tomsk Academy of Control Systems and Radioelectronics, Russia
Aleksandr Ivanovich
Mel'nikov
Tomsk State Academy of Control Systems and Radioelectronics, Russia
Sergei Antonovich
Novikov
Research Institute of Nuclear Physics at TPU, Russia
Sergei Viktorovich
Razin
Research Institute of Nuclear Physics at TPU, Russia
Evgenii Leonidovich
Shoshin
Tomsk Academy of Control Systems and Radioelectronics, Russia
92-98