Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
69
11
2010
SCATTERING PROPERTIES OF RESONANT SLOTTED LOOP RADIATORS FOR CYLINDRICAL MICROSTRIP ANTENNAS
939-946
10.1615/TelecomRadEng.v69.i11.10
A. Ye.
Svezhentsev
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
V. V.
Kryzhanovsky
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
radar cross‐section
strip loop radiators with a slot
method of moments
The radar scatter cross-section is calculated for a cylindrical microstrip antenna with a novel strip loop radiator with a slot. The resonance properties of a solitary and coupled strip loop radiators with slots are analyzed. Amplitude and phase distributions of the surface current density across the radiators are calculated. It is shown that the resonance frequencies of the suggested strip loop radiators with a slot are shifted considerably toward lower frequency range as compared with the characteristic frequencies of radiators of the cylindrical-rectangular geometry. It is shown that radiators of the kind may prove prospective for application in small-size microstrip antennas, including those operating at shorter wavelengths.
FIELDS OF A RECTANGULAR LOOP ANTENNA IN THE NEAR ZONE
947-957
10.1615/TelecomRadEng.v69.i11.20
N. N.
Gorobets
V. Karazin National University of Kharkiv, 4, Svoboda Sq., Kharkiv, 61022,
Ukraine; Kharkiv National University of Radio Engineering and Electronics, 14 Nauka Ave,
Kharkiv, 61166, Ukraine
A. V.
Tryvajlo
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkiv, 61077, Ukraine
electromagnetic waves
radiation
near‐field zone
traveling‐wave antenna
loop
Based on the method of the Hertz potentials the expressions have been derived to calculate all the components of electromagnetic radiation fields of the rectangular loop antenna excited by the traveling current wave in the spherical and Cartesian coordinate system unrestricted on the radiator sizes and the distance to the point of observation. It is shown that in the near-field zone of radiation the vectors of electric and magnetic fields have in the spherical and Cartesian coordinates all 6 components. The wave processes near the radiator under consideration differ by heavy amplitude gradients of electromagnetic fields.
PATTERN CHARACTERISTICS OF DISPERSED ANTENNA ARRAYS
959-966
10.1615/TelecomRadEng.v69.i11.30
A. A.
Bulgakova
V. Karazin National University of Kharkov
electromagnetic waves
antennas
antenna arrays
antenna pattern
Antenna patterns, directivity gain (DG) and scattering coefficient of an equidistant linear array are calculated and their dependencies upon a number of emitters and the range between them are analyzed. It is demonstrated that for each number of emitters there exists an optimal antenna length equal to L ≈ 0.9(N − 1) , at which the DG maximum maximorum is attained. At a larger length of the antenna or with increasing of the operation frequency the value of DG is varied under the oscillating laws. As this takes place, the difference between maximums and minimums is the larger, the more is the number of
emitters. At a small number of emitters (N ≤ 8) the pattern characteristics of the array are higher than those of a continuous antenna having the same electrical length, while at N ≥ 16 their characteristics form practically a match.
RATIOS FOR CALCULATING CHARACTERISTICS OF NETWORKS WITH A RING TOPOLOGY
967-980
10.1615/TelecomRadEng.v69.i11.40
S. L.
Gavlievskii
Volga District State Academy of Telecommunications and Informatics, Samara, Russian Federation
ring topology
routing
multiservice network
theory of sets
broadband transmission
Ratios allowing building analytical models, describing the flows on the branches and nodes of a network with a ring topology in the form of a system of linear algebraic equations, the solution of which gives a series of useful characteristics for systemic analysis, are given.
AN ALGORITHM OF EVALUATION OF PHASE-MANIPULATED SIGNAL ENERGY SPECTRA USING A SMOOTH PHASE VARIATION LAW
981-991
10.1615/TelecomRadEng.v69.i11.50
V. I.
Yarmolenko
Yaroslavl State University, Yaroslavl, Russian Federation
A. L.
Priorov
Yaroslavl State University, Yaroslavl, Russia
energy spectra
angular modulation
modulation function
phase-modulated signal
Energy spectra of signals with angular modulation and determined modulation functions are analyzed. Expressions for determining spectra of such signals are cumbersome and not always convenient for application. New expressions and algorithms for evaluating energy spectra of PM signals are proposed. The accuracies of calculation of energy spectra of such signals by known and newly proposed expressions are compared.
THE ALGORITHM OF FORMATION OF CARRIER OSCILLATIONS FOR A LINEAR COMMUNICATION CHANNEL WITH ADDITIVE GAUSSIAN WHITE NOISE
993-1004
10.1615/TelecomRadEng.v69.i11.60
K. A.
Batenkov
Academy of the Russian Federal Security Service, Orel, Russian Federation
Gaussian white noise
oscillation frequency
communication channel
carrier oscillations
frequency response
The assertion on the method of formation of a system of basic functions of the communication channel input and output (carriers) is established. The solution of the problem by a numerical method is obtained. The assertion on its accuracy based only on the original data is established. An algorithm for the shaping of basic function is developed.
SELF-EXCITED OSCILLATIONS IN ABRUPT p - n JUNCTIONS WITH A FIXED REVERSE BIAS
1005-1017
10.1615/TelecomRadEng.v69.i11.70
P. P.
Maksymov
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy
of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
K. A.
Lukin
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
semiconductor
self‐oscillation diffusive‐drifting model
reverse-biased p‐n junction
impact ionization
Numerical methods are used to solve the drift-diffusion model equations for reverse-based p - n junctions. A regime of self-excited oscillations is analyzed for an abrupt junction with a fixed reverse bias. As has been shown, the equations of the drift-diffusion model of the p - n junctions under analysis in fact make up a mathematical model of a self-oscillating system. The generation mechanism of self-excited excitations has been
investigated. The factors influencing the oscillation frequency, amplitude and spectrum have been established and frequency ranges determined for reverse-biased p - n junctions made of various materials.
A SOLUTION ALGORITHM FOR THE DRIFT-DIFFUSION MODEL EQUATIONS OF SEMICONDUCTING STRUCTURES WITH AVALANCHE p - n JUNCTIONS
1019-1030
10.1615/TelecomRadEng.v69.i11.80
P. P.
Maksymov
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy
of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
semiconductor
algorithm
reverse-based pn-i-pn structure
avalanche-cascade amplification
impact ionization
difference method
microwave radiation
An algorithm has been developed for solving the equations of the drift-diffusion model of reverse-based pn - i - pn structures with abrupt p - n junctions. The algorithm is based on the finite-difference equations of the modified counter-sweep method, combined with a technique for calculating semiconducting pn - i - pn structures with abrupt p - n junctions and methods for analyzing abrupt p - n junctions in the self-oscillation regime. The computation error is estimated for the electric field in Ge-, Si- and GaAs-based pn - i - pn structures with a feedback. The relative error of computation has been shown to decrease as the number of modes of the finite difference scheme is increased being limited by the error at approximating to differential operators by the finite-difference ones. The electric field self-oscillations and current densities in such structures are analyzed along with their spectra. The limiting case of low avalanche currents has been investigated.