Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
73
11
2014
RESONANCE INCREASE OF THE Q−FACTOR OF MAGNETIC-TYPE EIGENOSCILLATIONS IN AN OPEN RESONATOR WITH BALL-SHAPED DIELECTRIC INSERTION
943-953
10.1615/TelecomRadEng.v73.i11.10
Yu. V.
Svishchov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
open resonant cavity
eigenfrequency
eigenmode Q-factor
Open resonators with spherical mirrors and various discontinuities are among the devices which have found a wide range of application in the microwave engineering. However, to the best author's knowledge there are no results presented in the scientific literature on investigating spectral characteristics in resonance wavelength range of open resonators with a ball-shaped dielectric insertion. The paper suggests a rigorous mathematical model of axiallysymmetric magnetic-type eigenoscillations in an open resonators with spherical mirrors and a ball-shaped dielectric insertion. Based on this model, the eigenfrequencies and Q−factors of eigenoscillations of the electrodynamic object under consideration are analyzed in dependence on its geometrical and constitutive parameters. The main result is detection and investigation
of the effect of resonance decrease (increase) of the eigenoscillation Q−factor as the geometrical and constitutive parameters of the ball-shaped insertion are changed. Also, the nature of the resonance behavior of the eigenoscillation Q−factor is elucidated. The results of the study should be taken into account in the cases of both insertion of various irregularities in open resonators
and reconstruction of amplitude field patterns by the probing body method.
POTENTIAL PERFORMANCE OF THE COMMUNICATION SYSTEMS USING AUTOCORRELATION RECEPTION OF SHIFT-KEYED NOISE SIGNALS
955-976
10.1615/TelecomRadEng.v73.i11.20
Mikhail E.
Ilchenko
Research Institute for Telecommunications, NTUU "KPI" 37, Peremoha Ave., 03056 Kyiv, Ukraine
V. I.
Kalinin
Fryazino branch of the Kotelnikov Institute of Radio Engineering and Electronics Russian Academy of Sciences 1, Vvedenskiy sq., Friazino, 141190, Russia
T. M.
Narytnyk
National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic
Institute" (NTUU "KPI") Peremohy Ave, 37, Kyiv, 03056, Ukraine
R. M.
Didkovski
Cherkassy state technological university 460, Shevchenko Blvd, Cherkassy 18006, Ukraine
UWB communications
noise carrier
transmitted reference
autocorrelation receiving
system performance
correlation-delay noise shift-keying
antipodal noise signals
differential noise shift-keying
bit error probability
bandwidth-delay product
Mathematical models of the signals peculiar to communications using the autocorrelation reception of the shift-keyed noise signals are suggested in the present paper. System performance is investigated and the particularities of the bit error probability dependence upon
the normalized signal-to-noise ratio and the bandwidth-delay product are revealed. The definition of the optimal value of the signal-to-noise ratio upon power is substantiated and the relevant values are calculated. The performed comparative analysis proved that the communication using the differential noise shift-keying, within which total time delay diversity is applied between the reference and the data signals, possesses the best system performance
among the communications considered in this paper.
DYNAMIC LIGHT SCATTERING IN LC−440 NEMATIC LIQUID CRYSTAL
977-983
10.1615/TelecomRadEng.v73.i11.30
A. P.
Fedoryako
Kharkiv National University of Radio Engineering and Electronics, 14, Lenin Ave, Kharkiv, 61166, Ukraine
A. I.
Kocherzhin
Kharkov National University of Radio Engineering and Electronics, 14, Lenin Ave, Kharkov, 61166, Ukraine
M. P.
Kukhtin
Kharkov National University of Radio Engineering and Electronics, 14, Lenin Ave, Kharkov, 61166, Ukraine
E. I.
Chernyakov
Kharkiv National University of Radio Engineering and Electronics, 14, Lenin Ave, Kharkiv, 61166, Ukraine
liquid crystals
dynamic light scattering
Kapustin-Williams
domains
The research has been performed related to electro-physical and optical properties of nematic liquid crystals LC−440 based on azoksy-compounds under applied direct and alternating electrical fields. It is shown that domain structure of LC−440 under applied alternating voltage sufficiently differs from the structure of turbulent current. In general, light transparency versus voltage of electric field is showing smooth dependence. The results obtained are being interpreted based on molecular models.
INFLUENCE OF GEOMETRICAL STRUCTURE ON THE PASS BAND OF 2−D PHOTONIC CRYSTAL FILTER
985-992
10.1615/TelecomRadEng.v73.i11.40
A. I.
Filipenko
Kharkov National University of Radio Engineering and Electronics, 14, Lenin Ave, Kharkov, 61166
A. N.
Donskov
Kharkov National University of Radio Engineering and Electronics, 14, Lenin Ave, Kharkiv, 61166, Ukraine
photonic crystal
waveguide
pass band
filter
Influence of pillar diameter on the frequency band of 2−D photonic crystal waveguide have been investigated. The results obtained show that the pas band and its boundaries change with variation of the diameter of pillars. It is also shown that changing in diameter certain of pillars in the photonic crystal waveguide structure may be used to design the filters with various frequency characteristics.
CONTROL AND STABILIZATION OF TEMPERATURE (0.8÷300 K) IN THE CRYODIELECTROMETER OF A GIGAHERTZ FREQUENCY BAND
993-1003
10.1615/TelecomRadEng.v73.i11.50
R. V.
Golovashchenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085
V. N.
Derkach
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085
M. K.
Zaetz
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
V. G.
Korzh
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura Str., Kharkiv 61085, Ukraine
A. S.
Plevako
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
S. I.
Tarapov
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine; Kharkiv National University of Radio Electronics 14, Nauka Av, Kharkiv 61166, Ukraine; V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61077, Ukraine
radiospectroscopy
dielectrometry
low temperatures
thermometry
A problem of accurate temperature stabilization and measurement arises during the development of low-temperature radiospectrometers designed for material dielectric parameter measurement in the millimeter waveband and in the wide temperature range. Thermometers used for measurement of low and ultra-low temperatures are usually based on the temperature dependence of particular material properties. Electric resistance thermometers are the most suitable for designing the circuits for temperature measurement and stabilization under the above-mentioned conditions. The temperature controller-stabilizer, being a precise automated
block, designed for measurement and stabilization of temperature of the disk dielectric resonator in the 0.8 K÷300 K temperature range is used in the cryodielectrometer of a gigahertz band.
The four-wire circuit with alternating-current supply to the thermal sensors is applied. The specialized resistive sensors with different-sign temperature resistance coefficients are tested. The accuracy of resistance detection of about 0.05% is provided. The accuracy of temperature stabilization is higher than ±0.01 K. Results of test experiments on the measurement of low-loss
dielectric material parameters at low temperatures are presented.
REFLECTOMETRY OF CARBON FIBER REINFORCED PLASTIC (CFRP) IN SUB − TERAHERTZ FREQUENCY RANGE: THEORY AND EXPERIMENT
1005-1015
10.1615/TelecomRadEng.v73.i11.60
V. V.
Yachin
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 4, Chervonopraporna St., Kharkiv, 61002, 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
T. L.
Zinenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
recursive scheme
carbon fiber reinforced plastic
periodic
multilayered structure
integral functionals
sub-terahertz frequency range
quasioptical reflectometer
We propose a new recursive scheme of finding the stable solution for the problem of electromagnetic wave scattering from multilayered periodic structure. The problem is solved by the method of Integral Functionals. The frequency dependences of the CFRP reflection coefficient obtained by the method of Integral Functionals and by the method of quasi-optical reflectometry in sub-THz frequency range at different polarizations and angles of the wave incidence on the CFEP sample are compared. The results obtained can serve as a base for investigation of more complicated CFRP models including modeling of different types of surface contaminations. They can help interpret CFRP reflectometry results more effectively as well as to improve the methods of CFRP non-destructive testing in THz range of electromagnetic spectrum.
MEASUREMENT OF DIELECTRIC MATERIAL PROPERTIES USING COUPLED BICONICAL RESONATORS
1017-1032
10.1615/TelecomRadEng.v73.i11.70
M. V.
Andreev
Oles Honchar Dnipro National University, 72, Gagarin Ave., Dnipro, 49010, Ukraine
O. O.
Drobakhin
Dnepropetrovsk National University, Ukraine
Ye. N.
Privalov
Institut of Technical Mechanics of National Academy of Science of Ukraine
D. Yu.
Saltykov
Dnepropetrovsk National University, 72, Gagarina Ave., Dnepropetrovsk, 49010, Ukraine
biconical resonator
coupled resonators
resonance frequency
Q-factor
permittivity
loss tangent
Coupled biconical resonators are under consideration. The results of study of the problem of application of such resonators in microwave measurements, in particular for measuring and monitoring parameters of solid and liquid dielectrics are presented. The advantage of technique
proposed is application of resonance frequency of empty resonator as reference one and replacement of Q−factor determination by measurements of the ratio of amplitudes of maxima of frequency transmission coefficient.