Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
78
7
2019
MINIATURIZED HALF MODE SUBSTRATE INTEGRATED WAVEGUIDE LEAKY WAVE ANTENNA WITH OPEN STOP BAND SUPPRESSION FOR Ku-BAND APPLICATIONS
559-568
10.1615/TelecomRadEng.v78.i7.10
Rahul
Agrawal
Dept. of ECE, DIT University, Mussorrie Diversion road, 248009 Dehradun, India
P.
Belwal
Dept. of ECE, DIT University, Mussorrie Diversion road, 248009 Dehradun, India
S.
Gupta
Dept. of ECE, DIT University, Mussorrie Diversion road, 248009 Dehradun, India
miniaturization
folded ground plane
half mode substrate integrated waveguide
open-stopband
broadside gain improvement
leaky wave antenna
A miniaturized frequency scanned leaky wave antenna (LWA) based on half mode substrate integrated waveguide (HMSIW) with open stop-band suppression is proposed. The modified cross-slot is etched on the top of HMSIW as the radiating element. The folded and unfolded ground plane designs of the proposed HMSIW LWA are compared and analyzed w.r.t their bloch impedance characteristics and it is found that further miniaturization and gain improvement at broadside by ~ 2 dBi are achieved for folded ground plane design. The proposed LWA scans a region from -40° to +24° as the frequency range increases from 12 to 17 GHz with broadside at 15.5 GHz. The HMSIW LWA with folded ground plane is fabricated and its performance is experimentally measured showing the close agreement between the simulation and the measured results.
RADIATION PROPERTIES OF HETEROGENEOUS ANTENNA ARRAY
569-578
10.1615/TelecomRadEng.v78.i7.20
M. V.
Shcherbakov
Co Ltd "Svyazenergoservis", 7/8 Zakhysnykiv Ukrainy Sq., Kharkiv, 61001, Ukraine
G. I.
Khlopov
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085, Ukraine
O. A.
Voitovych
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085, Ukraine
V. N.
Pehota
Co Ltd "Svyazenergoservis", 7/8 Zakhysnykiv Ukrainy Sq., Kharkiv, 61001, Ukraine
S. V.
Myroniuk
State Design Office "Yuzhnoye", 3 Kryvorizhska St., Dnipro, 49008, Ukraine
V. D.
Pavlenko
State Design Office "Yuzhnoye", 3 Kryvorizhska St., Dnipro, 49008, Ukraine
A. V.
Ovcharov
State Design Office "Yuzhnoye", 3 Kryvorizhska St., Dnipro, 49008, Ukraine
antenna array
radiation pattern
diffraction lobe
scan sector
The construction of the antenna array of heterogeneous aperture radiators based on sectorial horn antennas of the Ka-band with different aperture dimensions exceeding the wavelength has been originally proposed. Solution results of the optimization problem showed that use of radiating elements with unequal rectangular aperture dimensions arranged in the form of concentric "rings" on the antenna array aperture provides the formation of a narrow beam pattern and suppression of the diffraction lobes at the edges of the scan sector to a level of –17 dB, when the amplification coefficient is reduced by no more than 1 dB. The proposed antenna system was designed for electrical scanning with a needle-shaped beam in orthogonal planes.
METHODS OF BUILDING GENERAL PARAMETERS AND KEYS FOR NTRU PRIME UKRAINE OF 5TH – 7TH LEVELS OF STABILITY. PRODUCT FORM
579-594
10.1615/TelecomRadEng.v78.i7.30
I. D.
Gorbenko
V. Karazin National University of Kharkiv, 4 Svoboda Sq., Kharkiv, 61022,
Ukraine; Kharkiv National University of Radio Electronics, 14, Nauka Ave., Kharkiv,
61166, Ukraine
O. G.
Kachko
Kharkiv National University of Radio Electronics, 14 Nauka Ave., Kharkiv 61166, Ukraine
Yu. I.
Gorbenko
Institute of Information Technologies, 12 Bakulina St., Kharkiv 61166, Ukraine
I. V.
Stelnik
Institute of Information Technologies, 12 Bakulina St., Kharkiv 61166, Ukraine
S. O.
Kandy
Institute of Information Technologies, 12 Bakulina St., Kharkiv 61166, Ukraine
M. V.
Yesina
V. Karazin National University of Kharkiv, 4 Svoboda Sq., Kharkiv 61022, Ukraine
asymmetric cipher
general parameters
quantum stability
stability level
finite fields
Product Form
The research was carried out and the development of an effective practical algorithm for the construction of system-wide parameters and keys of cryptographic transformations such as asymmetric ciphers for a special form of setting the Product Form polynomial was performed. The experimental confirmation of the built-in system-wide parameters for 5–7 stability levels NTRU PRIME UKRAINE, taking into account a combined attack is given.
METHOD FOR DEVELOPMENT OF DATABASES EASILY ADAPTABLE TO VARIATIONS IN THE SUBJECT DOMAIN
595-605
10.1615/TelecomRadEng.v78.i7.40
V. I.
Yesin
V. Karazin National University of Kharkiv, 4 Svoboda Sq., Kharkiv, 61022,
Ukraine
V. V.
Vilihura
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022,
Ukraine
database
relational database
database schema
data model
data model with an universal basis of relations
"object-event" data model
A method for developing relational databases with the schema invariant to subject domains is proposed. The use of this method unlike the traditional technology of designing relational databases allows: creating databases for various simulated subject domains that meet the requirements of consumers of the information product in the process of reengineering, with less time and financial costs; adapting relational databases built on the basis of a scheme with a universal basis of relations to dynamic changes in subject domains, without changing the database schema, due to the use of the created predetermined structure of basic relations.
STUDYING OF k-DIMENSIONALITY OF THE LILI-128 CIPHER BOOLEAN FUNCTION
607-614
10.1615/TelecomRadEng.v78.i7.50
S. M.
Konushok
Institute of Special Communication and Information Security of Igor Sikorsky National Technical University of Ukraine "Kyiv Polytechnic Institute", 4 Verkhnokliuchova St., Kyiv 03056, Ukraine
cryptographic properties of Boolean functions
k -dimensional function
probabilistic algorithm
improved k -dimensional test
LILI-128 cipher
The paper presents results of the experimental study of the k-dimensionality of the LILI-128 cipher Boolean function, which demonstrated the potential for the execution of a statistical attack based on near-proximity of the Boolean functions with algebraically degenerate functions.
LOCALIZED WAVES IN LAYERED SUPERCONDUCTORS
615-631
10.1615/TelecomRadEng.v78.i7.60
S. S.
Apostolov
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, 61077, Ukraine
D. V.
Kadygrob
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, 61077, Ukraine
Z. А.
Maizelis
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, 61077, Ukraine
T. N.
Rokhmanova
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
A. A.
Shmat'ko
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine
V. A.
Yampol'skii
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
layered superconductor
localized waves
anomalous dispersion
In this review, the propagation of electromagnetic waves localized near the boundary of a layered superconductor sample with the layers either parallel or perpendicular to its surface is discussed. The results obtained in a series of studies on investigating the dispersion relation for such waves are generalized, classified and supplemented. Because of the strong anisotropy and nonlinearity of the Josephson plasma in layered superconductors the localized waves can possess unusual resonance properties, and their excitation can be accompanied by specific resonance phenomena. The electromagnetic field in a layered superconductor is determined by the distribution of the gauge-invariant phase difference of the order parameter that satisfies the set of coupled sine-Gordon equations. Based on the solution of these equations and also on the Maxwell's equations in a dielectric environment, dispersion relations have been derived for the localized electromagnetic waves. The samples of a layered superconductor whose layers are parallel to its boundary can support propagation of both surface waves and waveguide modes characterized by the normal dispersion. The dispersion relation for the samples whose layers are perpendicular to the boundary is dependent on the angle of wave propagation with respect to the superconducting layers. It has first been shown in this paper that the waves localized in a plate of a layered superconductor are characterized by the anomalous dispersion for all directions except propagation strictly along the layers. The dispersion curves for such waves can have point of maximum and/or minimum that can lead to nontrivial effects, for example, to the light stop or internal reflection. Also, excitation of localized waves and unusual resonance effects arising in this case are discussed in the paper. Because of the strong anisotropy and nonlinearity of the layered superconductor the dispersion relations for the waves localized either in semi-infinite samples or in plates possess a number of interesting features giving rise to new phenomena important for application in the terahertz range physics.
NONLINEAR THEORY OF INTERACTION BETWEEN A TUBULAR BEAM OF CHARGED PARTICLES AND POTENTIAL SURFACE WAVES OF PLASMA CYLINDER
633-649
10.1615/TelecomRadEng.v78.i7.70
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
Yu. V.
Prokopenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy
of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
Vladimir M.
Yakovenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085
electron beam
beam instability
instability increment
Cherenkov effect
nonlinear interaction
capture of particles
phase portrait
Investigation of the generation mechanisms of electromagnetic waves by the motion of charged particles in various electrodynamic systems is an actual problem of modern radiophysics and electronics. Recently, much attention has been paid to the interaction between the streams of charged particles and solid-state structures that have dispersion properties. As a rule, such structures contain plasma-like media. The basis for the generation of electromagnetic waves is the system instabilities caused by perturbations in the streams of charged particles. The stationary mode of wave generation is provided by nonlinear interactions of a charged particle beam with eigenmodes of solid-state structure. In this paper, a theoretical study of the nonlinear stabilization effect of instability of an infinitesimally thin tubular electron beam propagating along the surface of a solid-state plasma cylinder has been carried out. Using Maxwell's equations and motion equation of plasma electrons based on an integrated approach (analytical and numerical), the nonlinear theory of instability of the tubular electron beam flying above the plasma cylinder has been constructed. The plasma of the cylinder was assumed collisionless. The calculations have been performed to an electrostatic approximation due to the nonrelativistic nature of motion of the beam. It is shown that the nonlinear stabilization of increase in the wave amplitude is realized due to the bunching of the beam electrons into clots
and their subsequent capture by the wave field. The dependence of the instability rise time and the wave maximum amplitude on the plasma cylinder radius has been found out. It is established that the nonlinear stage of instability begins earlier in an electro-dynamic system with a smaller radius of the plasma cylinder. At that in such a system, the maximum magnitude of the slow amplitude has a greater value. The research results broaden our understanding about the physical properties of systems with plasma-like media and systematize our knowledge about the excitation mechanisms of potential surface waves in the electrodynamic systems that form the basis of microwave oscillators.