Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
72
14
2013
RIGOROUS SIMULATION OF DIFFRACTION RADIATION EFFECT: ELECTRODYNAMICS OF PERIODIC STRUCTURES PLACED IN THE SURFACE WAVE FIELD OF DIELECTRIC WAVEGUIDES
1263-1278
10.1615/TelecomRadEng.v72.i14.10
S. S.
Sautbekov
L.N. Gumilyov Eurasian National University, 2, Mirzoyana St., Astana 010000, Republic of Kazakhstan; Al-Farabi Kazakh National University, 71, al-Farabi Av., Almaty 050040, Republic of Kazakhstan
Yuriy
Sirenko
IRE NAN Ukraine
Alexey A.
Vertiy
L.N. Gumilyov Eurasian National University, 2, Satpayev St., Astana
010008, Kazakhstan
open initial boundary value problems
exact absorbing conditions
diffraction radiation effect
near field to far field conversion
diffraction antennas
The method of the exact absorption condition (EAC-method) has been applied to simulate and analyze the processes involving the effective conversion of surface waves into outgoing waves, i.e., to the waves that carry away a specified fraction of the supplied energy in a prescribed
direction. Of the most instances so far considered, the periodic structure acts as a key functional element in this type of near-to-far field conversion. Meanwhile, the present study is focused on the finite periodic structure placed in the field of finite dielectric waveguide, thereby
allowing us to compute those characteristics whose analysis is complicated within the frame work of other widely used approaches.
THE CHOICE OF ROOTâ€MUSIC PARAMETERS FOR RADAR MEASUREMENTS OF TARGET ELEVATION NEAR SEA SURFACE
1279-1287
10.1615/TelecomRadEng.v72.i14.20
Yu. A.
Pedenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine,12 Academician Proskura St., Kharkov 61085, Ukraine
rootâ€MUSIC methods
lowâ€altitude target
elevation measurement
computer simulation
The rootâ€MUSIC high spectral resolution algorithm has been considered recently as one of the means to solve the problem of increasing the accuracy of measuring the lowâ€altitude target elevation above rough sea. However, the traditional approach to the selection of a priori parameters of the method developed with spectral analysis does not reveal its advantage in accuracy compared to the best special methods proposed to solve this problem. This was the reason for the development of various modifications of the method. In this paper, computer
simulations are used to study the method in its classical form, but with use of a priori parameters, including significantly different from those used in other studies. In particular this applies to the dimensionality of subspace of signals. It was found that the increase of the signal subspace dimensionality from two, due to the use of a specular reflection model, up to fiveseven, improves the measurement accuracy of the elevation of lowâ€altitude targets by several times. It was found that increases in accuracy occur in any case of strong diffuse or strong
specular reflection of radio waves from the sea.
RADIO ACOUSTIC SOUNDING SYSTEMS: PART 1. THE DIFFRACTION PROBLEM FOR A BISTATIC ZONE
1289-1296
10.1615/TelecomRadEng.v72.i14.30
Liu
Chang
Heilongjiang Bayi Agricultural University, 5, Xinfeng Str., Daqing, 163319, China
A. Yu.
Panchenko
Kharkiv National University of Radio Electronics, 14, Nauky Avenue,
Kharkiv, 61166, Ukraine
Mykola I.
Slipchenko
Kharkiv National University of Radio Electronics, 14, Nauky Avenue,
Kharkiv, 61166, Ukraine
radio acoustic sounding systems
diffraction problem
atmospheric boundary layer
radio antenna
acoustic radiator
Fraunhofer zone
Doppler frequency
shift
optical length
There are a number of problems that prevent the implementation of the radio acoustic sounding method in meteorological measuring practice. Among them is a lack of a rigorous solution of the diffraction by an artificial reflector formed by the spaceâ€limited beam of acoustic waves. The general solution of this problem is very cumbersome. Current work is concerned with conditions and approaches of solving this problem. The possible approximations that are derived from the theory of antennas have been shown. Preliminary results of the diffraction problem in a bistatic zone have been presented. In particular, it was demonstrated the change in
the level of the received signal as a height function of sounding.
OBLIQUE SURFACE JOSEPHSON PLASMA WAVES IN LAYERED SUPERCONDUCTORS
1297-1319
10.1615/TelecomRadEng.v72.i14.40
Yu. O.
Averkov
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
layered superconductor
oblique surface Josephson plasma waves
ordinary and extraordinary electromagnetic waves
attenuated total reflection method
In this paper the theoretical analysis of the oblique surface Josephson plasma waves propagating along a dielectricâ€layered superconductor interface is first represented. The case when the superconductor layers are perpendicular to the interface is considered. The oblique surface Josephson plasma waves are the surface electromagnetic waves propagating in the interface
plane at an arbitrary angle to the superconductor layers. The electromagnetic field of the waves is the superposition of ordinary and extraordinary surface electromagnetic waves. The dispersion equation of the oblique surface Josephson plasma waves has been derived. This equation is the most general dispersion equation of the surface Josephson plasma waves in the case under study. The problem on the excitation of oblique surface Josephson plasma waves by means of the attenuated total reflection method is solved. It has been established that the process of the excitation of oblique surface Josephson plasma waves is accompanied by the onset of an additional reflected wave in the prism with the polarization, being orthogonal to the polarization of the incident wave. It has been found that the reflection coefficient of the exciting wave in the prism can vanish for some optimal parameters of the structure.
SURFACE ELECTROMAGNETIC WAVES IN THE PLASMAâ€LIKE MEDIUM BORDERING A PERIODIC LAYERED STRUCTURE
1321-1337
10.1615/TelecomRadEng.v72.i14.50
Yu. O.
Averkov
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
N. N.
Beletskii
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085
Vladimir M.
Yakovenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085
periodic layered structure
plasmaâ€like medium
surface
electromagnetic waves
surface electromagnetic states
In this paper, we represent the theoretical analysis of dispersion properties of the surface TM- and TE â€waves, propagating at the interface between a photonic crystal and a plasmaâ€like medium. It is assumed that an elementary cell of the photonic crystal is composed of two different nonâ€magnetic dielectrics. The change of the trend of the dispersion curves of the surface electromagnetic waves with the configuration of the elementary cell has been studied. It is shown that the layer sequence in the elementary cell and the relationship of their widths exert a significant influence on the dispersion properties of the surface electromagnetic waves. It has been established that in the case where the dielectric layer with the highest dielectric constant borders on the plasmaâ€like medium the surface electromagnetic waves exist in the wide frequency range at an arbitrary relationship between the layers widths.
DIFFRACTION OF COHERENT RADIATION BY SURFACES HAVING NONâ€GAUSSIAN STATISTICS OF ROUGHNESS
1339-1348
10.1615/TelecomRadEng.v72.i14.60
M. I.
Dzyubenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine; V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine; Kharkiv National University of Radio Electronics, 14 Nauka Ave, Kharkiv 61166, Ukraine
S. N.
Kolpakov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
I. V.
Popov
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy
of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
A. A.
Priyemko
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine
speckleâ€field
coherent radiation
statistical optics
The character of scattering surface is determined by distribution of diffraction maximums obtained by interaction of diffraction field and a reflecting plane. However, the question of forming of the speckle fields observed as a result of interaction of coherent radiation with the diffusely scattering surfaces described by nonâ€Gaussian distribution of roughness is studied insufficiently. In this paper distribution of amplitude of the speckle fields appearing as a result of diffraction of laser radiation on the mechanically finished surfaces is investigated experimentally and theoretically. Mathematical simulation of the speckle fields the amplitude
distribution of which are not subject to the Gaussian statistics has been carried out. It is proven that speckleâ€fields formed as a result of interaction between coherent radiation and rough surfaces are not absolutely random and contain information about the degree of organization
that characterizes the object.
RADIATION CHARACTERISTICS OF THE METAL WAVEGUIDE RESONATOR WITH A INCLINED MIRROR
3149-1359
10.1615/TelecomRadEng.v72.i14.70
A. V.
Volodenko
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077
O. V.
Gurin
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022,
Ukraine
А. V.
Degtyarev
V. Karazin National University of Kharkiv, 4, Svoboda Sq., Kharkiv, 61022,
Ukraine
V. A.
Maslov
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine
V. A.
Svich
V. Karazin National University of Kharkiv, 4, Svoboda Sq., Kharkiv, 61077
V. S.
Senyuta
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine
A. N.
Topkov
V. Karazin Kharkiv National University 4, Svoboda Sq., 61077 Kharkiv, Ukraine
waveguide resonator
misalignment
terahertz band
energy loss
modes
The influence of the misalignment of the plane mirrors for the metal waveguide laser resonator of terahertz range (λ ∼ 0.4326 mm) on energy losses and the mode composition of radiation is investigated. It is shown that misalignment of the cavity at the change of direction of the tilt plane of mirrors relative to the plane of polarization of the exciting radiation can have a significant influence on the characteristics of its lower asymmetric modes.