Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
72
15
2013
EIGENMODES AND RESONANCE PROPERTIES OF ONEâ€DIMENSIONALLY PERIODIC METALLIC BAR GRATINGS. PART 1: CLASSICAL GRATING
1361-1379
10.1615/TelecomRadEng.v72.i15.10
Andrei Olegovich
Perov
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
A. A.
Kirilenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy
of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
S. L.
Senkevich
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
oneâ€dimensionally periodic structures
metallic bar grating
resonance scattering
natural oscillations
The interest shown today toward resonance properties of perforated metal gratings has been renewed owing to the effect known as the "enhanced transmission phenomena" which was investigated, interpreted and found promising for practical applications. Based on the works of the V. Shestopalov school, the paper is aimed at analyzing properties of oneâ€dimensionally periodic gratings, i.e. at investigating eigenmode spectra and principles of their formation which are determined in particular by the structure of the grating period, and then at analyzing the impact of these spectra on the resonance characteristics. The effects arising in the case of scattering of an Hâ€polarized plane wave by a oneâ€dimensionally periodic metallic bar grating are considered. Specific features of the resonance interaction are treated in terms of the
spectral theory of open periodic resonant cavities. A classification is suggested for the spectra of classical and compound gratings. The spectrum of lowerâ€order eigenmodes of the classical grating is investigated in dependence on the grating geometry, and motion of the
eigenfrequencies along a multisheeted Riemann surface is analyzed as the grating thickness decreases to zero. It is shown that the limiting points of frequencies of antisymmetric modes correspond to the cutoff points of the higherâ€order Floquet harmonics; the greater the number of
eigenmode field variations, the higher order of the harmonic. Eigenfrequency paths on upper sheets and regularities of their crossing the real axis where the wave packet conversion takes place are investigated. The resonance behavior of the grating is described in terms of the unified spectral theory which makes it possible not only to establish the interrelation between different
resonance effects but also to determine the source of such a behavior conditioned by excitation of certain eigenmodes.
THE BOUNDED PERIODICALLY SLOTTED MICROSTRIP STRUCTURE AS A RADIATING MODULE
1381-1390
10.1615/TelecomRadEng.v72.i15.20
D. V.
Mayboroda
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine
Sergey A.
Pogarsky
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine
L. I.
Saprykin
V. Karazin National University of Kharkiv
microstrip line
slot line
eigenwave spectrum
radiation pattern
The radiating properties of periodically slotted microstrip structure are analyzed in the context of designing highâ€tech and multifunctional elements and radiating systems. A special emphasis is placed upon the study into the characteristics that are governed by the peculiar features of structural components. Using numerical simulation and experimental data makes it possible to produce functional elements with a high level of parameters.
SIMULATION OF WAVEGUIDE TURNSTILEâ€TYPE JUNCTION WITH A SQUARE WAVEGUIDE OUTPUT FOR INCOHERENT SCATTER RADAR ANTENNA
1391-1398
10.1615/TelecomRadEng.v72.i15.30
Ya. N.
Chepurnyy
Research Institute for Radio Engineering Measurement; Institute of Ionosphere, National Academy of Sciences of Ukraine
S.V.
Chernyaev
Institute of Ionosphere, National Academy of Sciences of Ukraine
I. B.
Sklyarov
Institute of Ionosphere, National Academy of Sciences of Ukraine
incoherent scatter radar
circularly polarized antenna
waveguide turnstile junction
square waveguide
polarizer
computer simulation
The computer simulation of the turnstile connection with a square waveguide output has been carried out. The matching unit dimensions have been optimized, and the main characteristics have been obtained. The use of the connection as a polarizer and antenna switch for incoherent
radar is proposed.
RADIO ACOUSTIC SOUNDING SYSTEMS: PART 2. USE OF THE FRESNEL APPROXIMATION CONCEPT FOR A RECEIVED SIGNAL NOTATION
1399-1409
10.1615/TelecomRadEng.v72.i15.40
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
aperture antennas
Fraunhofer zone
antenna pattern
Fresnel zone
wave optics
focusing system
Radio Acoustic Sounding Systems built on the traditional bistatic scheme preclude the weather data selection at the lower section of the sounding path. This is due to complexity of the diffraction solution. The bistatic RASS have a delay between the sending of sounding packet
and the beginning of signal reception. It was shown that the value of this delay corresponds to the Fresnel zone entry time of the sounding sending. Using the Fresnel approximation will considerably simplify the diffraction solution and, subsequently, will reduce the systematic
error while determining meteorological parameters in the surface layer of the atmosphere.
EVALUATION OF THE INFLUENCE OF DEFECTS ON THE QUALITY OF COMPOSITES USING A QUASI-OPTICAL POLARIZATION-FREQUENCY REFLECTOMETRY IN SUB-TERAHERTZ DOMAIN
1411-1422
10.1615/TelecomRadEng.v72.i15.50
V. I.
Bezborodov
O.Ya. Usikov Institute for Radio Physics and Electronics,
National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkiv 61085, Ukraine
V. K.
Kiseliov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine; V.N.Karazin Kharkiv National University 4, Svobody sq., 61022, Kharkiv, Ukraine
Ye. M.
Kuleshov
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
P. K.
Nesterov
O.Ya. Usikov Institute for Radio Physics and Electronics,
National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkiv 61085, Ukraine
S. V.
Mizrakhy
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura Str., Kharkiv 61085, Ukraine
M. S.
Yanovsky
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, Ukraine
quasi-optics
terahertz band
polarization-frequency reflectometry
nondestructive testing
carbon fiber reinforced plastic
Quasi-optical polarization-frequency reflectometry in subterahertz (sub-THz) frequency band is considered as a nondestructive method for detecting of subsurface damage of composite materials. Such materials are used in modern aerospace industry to create robust lightweight structures using adhesive technology. The present paper relates to studying of the possibility of detecting volumetric moisture and thermal damage of the carbon fiber reinforced plastic (CFRP) structures in order to evaluate a quality of surface preparation before CFRP samples bonding. For this purpose we have used quasi-optical beamguide systems to perform polarization in the sub-THz frequency domain (0.1…0.2 ТHz). The measurements of amplitude-frequency and polarization reflecting characteristics of the CFRP samples showed that the thermal effects and volumetric moisture result in changes of reflecting characteristics
of samples in this frequency band. The promising results are obtained to use this method when creating means for nondestructive testing and evaluation of the quality of the surface of the CFRP composites before cement together.
BOLOMETRIC MEASURER OF LINEAR POLARIZATION OF LASER RADIATION
1423-1429
10.1615/TelecomRadEng.v72.i15.60
S. V.
Pogorelov
National University of Pharmacy, 53 Pushkinskaya St., Kharkiv 61027, Ukraine
B. V.
Safronov
V. Karazin National University of Kharkiv, 4, Svoboda Sq., Kharkiv, 61077, Ukraine
V. P.
Balkashin
V. Karazin National University of Kharkiv, 4, Svoboda Sq., Kharkiv, 61077, Ukraine
I. A.
Priz
V. Karazin National University of Kharkiv, 4, Svoboda Sq., Kharkiv, 61077, Ukraine
I. V.
Krasovskyy
National University of Pharmacy, 53, Pushkinska Str., Kharkiv, 61002, Ukraine
laser radiation
linear polarization
bolometer
signal of grating
coefficient of dichroism
Method for measuring linear polarization of laser radiation using twoâ€grating bolometer with mutually nonâ€perpendicular bolometric grating elements was proposed, proved and experimentally validated.
VARIABLE ARRAY PATTERNS FOR MULTIFOCAL ELECTRORETINOGRAPHY
1431-1437
10.1615/TelecomRadEng.v72.i15.70
C. A.
Herrera-Ramirez
National Polytechnic Institute of Mexico (IPN), ESIME-UPC, Mexico
Luis
Nino-de-Rivera
National Polytechnic Institute of Mexico (IPN), National Institute for Astrophysics, Optic & Electronics, Puebla, Mexico
multifocal electroretinography
stimulus pattern
retinal areas
ERG response
The multifocal electroretinography (mfERG) response is associated with using a structured stimulus, usually by an array of hexagonal elements projected in the central 40°−60° degrees of the retina. A series of waves are obtained by mfERG usually with 61,103 and till 241 elements of the stimulus pattern. However, higher resolution of the mfERG system is still an open problem, which improvement requires a higher number of elements in the pattern in order to stimulate the smallest possible retina area. This approach has to overcome many problems related mainly with the low voltage amplitude and response to stray light with amplifier technology. We present in this paper results from a significant reduction in the area of each hexagonal area of stimulus pattern using technology at hand through Itan Technologies RHA2216biosignal amplifier. The paper discusses too a new strategy for the stimuli considering a variety of resolutions, long variable sequences, frame rates and colours. This paper shows the results of stimulation tests performed on healthy human subjects who were stimulated with standard 61 to 153 patterns, which results are compared with our improved proposal from 519 to 1997 hexagonal patterns that improving low voltage cone response and stray light problems.
PHYSICAL BASIC OF BUILDING ACTIVE ACOUSTO-THERMOMETERS
1439-1452
10.1615/TelecomRadEng.v72.i15.80
Oleg
Sytnik
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
S. A.
Masalov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
A. I.
Logvinenko
A. Usikov Institute of Radio Physics and Electronics; A.I. Kalmykov's Center of Earth radiophysic sounding, National Academy of Sciences and National Space Agency of Ukraine, 12, Ak. Proskury Str., Kharkiv, 61085, Ukraine
G. I.
Klochko
A. Usikov Institute of Radio Physics and Electronics; A.I. Kalmykov's Center of Earth radiophysic sounding, National Academy of Sciences and National Space Agency of Ukraine, 12, Ak. Proskury Str., Kharkiv, 61085, Ukraine
ultrasound
temperature
reflected signal
gradient
noise
sound velocity
The present paper discusses the problem of detecting and identifying the heat transfer processes in living tissues using a noninvasive ultrasound technique. An optimal method, which is optimal in terms of maximum of likelihood, is proposed to detect the temperature variations within an internal layers of the living tissue when the latter is locally heated. An algorithm for
estimating the spatial distribution of temperature gradients is based upon the measurement of the phase difference of ultra-sound low-power signals reflected from the inhomogeneities of tissues as well as upon the calculations of temperature increment in terms of estimated
variations in delays of a received signal. The properties of signals returned from different tissues are examined. The ultrasound velocity for different temperatures and the salt composition of a specimen under study is estimated. The key factors affecting the magnitude of a meter error are studied. The arrangement of a device designed to investigate the heat transfer processes in living tissues is developed. A digital part of the device consists of phase and amplitude channels. The phase channel is used to make estimates of temperature gradients, whereas the amplitude channel serves as an auxiliary means of searching localized inhomogeneities and determining their spatial characteristics. Results of the algorithm
simulation are given. The specific features of its performance in real interference situation are discussed.