Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
60
5&6
2003
TEM-Field Calculation for Waveguides with Complicated Cross-Sections
14
10.1615/TelecomRadEng.v60.i56.10
D. Yu.
Kulik
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
Victor Ivanovich
Tkachenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
S. L.
Senkevich
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
The main goal of the paper is to present a mode-matching based algorithm of TEM-wave field calculation for waveguides with arbitrary piecewise-linear Cartesian boundary cross-section. The calculation results for a number of lines is provided. The comparative analysis of some methods for calculation of wave impedance has been executed.
E- and H-Polarized Plane Waves-Scattering and Absorption by an Impedance Strip Grating
9
10.1615/TelecomRadEng.v60.i56.20
The problem of plane wave scattering by a planar grid of impedance strips has been posed and solved. The problem formulation includes a set of generalized boundary conditions to relate the fields to effective electric and magnetic currents. We have obtained a numerical solution of the problem by applying the analytical regularization technique to dual series equations, which approach ensures rapid convergence and controllable accuracy. Calculations are presented for the reflected, transmitted and absorbed power in dependence on frequency for a variety of surface impedance magnitudes of the grating strips.
Properties of Reflection Grating Composed of Short-Circuit Rectangular Waveguides in Autocollimation Condition Mode
7
10.1615/TelecomRadEng.v60.i56.30
A. V.
Gribovsky
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 4 Mystetstv St.,
Kharkiv 61002, Ukraine
It is shown that an effect of total non-specular reflection can be achieved under the diffraction of the plane TE- and TM-waves by the model of a reflecting two-dimensional (2-D) periodic grating made up of short-circuit rectangular waveguides. The modules of space-harmonic amplitudes are calculated as a function of the length of short-circuit waveguides operating in the autocollimation mode. The obtained results can be use, say, for designing open resonators, one of their mirrors being a 2-D periodic grating that comprise short-circuit waveguides.
The Vertical Electric Dipole Field in Presence of a Sphere with Circular Hole
10
10.1615/TelecomRadEng.v60.i56.40
Yu. V.
Svishchov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
The original boundary value problem is reduced to the infinite system of linear algebraic equations of the second kind in the form (I + H)x = b, x,b ∈ l2, with operator H which is compact in l2. The eigenfrequency spectrum corresponding to axially symmetric, electric-type oscillations of a sphere with circular hole has been calculated. The action of resonant regimes (intermode coupling in particular) on the structure scattering properties has been studied.
Scattering from the Slots in a Waveguide Filled with an Imperfect Dielectric
11
10.1615/TelecomRadEng.v60.i56.50
L. P.
Yatsuk
V. Karazin National University of Kharkov, 4, Svoboda Square, Kharkov
61077, Ukraine
T. G.
Nazarenko
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077, Ukraine
The problems of theory of narrow slots in walls of a waveguide filled with imperfect dielectric are under consideration. The power balance equation has been formulated. For the longitudinal and transverse slots in a rectangular waveguide the reflection, transfer, radiation coefficients and the part of power consumed for dielectric heating have been investigated. It is shown that the higher-mode waves make a considerable contribution into Ohm's losses which are much greater for a longitudinal slot than for a transverse one.
New Principles of Development of Corner Filters
6
10.1615/TelecomRadEng.v60.i56.60
V. D.
Sakhatsky
Ukrainian Technological and Pedagogical Academy, Kharkov, Ukraine
A.R.
Korsunov
Ukrainian Technological and Pedagogical Academy, Kharkov, Ukraine
Equations are obtained for calculation of parameters of corner radio-absorbing filters whose principle of operation consists in transformation of energy of incident radiation into energy of fast surface waves.
A Receiving Loop Antenna for Super-Broadband Pulsed Signals
13
10.1615/TelecomRadEng.v60.i56.70
T. N.
Ogurtsova
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
G. P.
Pochanin
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
P. V.
Kholod
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
A simple method is suggested for parameter estimation of loop antennas intended for reception of superbroadband pulsed signals. The effect of size and load resistance of the antenna upon its broadbandness and sensitivity are analyzed. The current amplitude at the antenna output has been analyzed in dependence on the geometrical size of the structure. The directional pattern of a multielement loop antenna and distortions of the received signal waveform are analyzed in dependence on the number of elements and dimensions of the structure.
Synthesis of the Specified State of Electromagnetic Wave Polarization in the Arbitrary Elliptically Polarized Basis
11
10.1615/TelecomRadEng.v60.i56.80
V.I.
Chebotarev
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077, Ukraine
G. M.
Chekalin
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077, Ukraine
The state of the electromagnetic wave polarization specified by the sum of two nonorthogonal elliptically polarized waves with an opposite sense of field vector rotation.
On the Principles of Calculating Radiating Devices with Impedance Elements
6
10.1615/TelecomRadEng.v60.i56.90
V. V.
Ovsyanikov
Oles Honchar Dnipro National University
72, Gagarin Av., Dnipro, 49010, Ukraine
A generalized computational algorithm for radiating devices with impedance elements is suggested. Its integrating function is to synthesize, analyze and optimize the electrodynamical radioengineering and design parameters of the above devices. An example is given of how to compute the radiation pattern and efficiency of a small-size spiral conical antenna with impedance loads at the ends of its branches.
Maintenance of the Continuity of a Phase When Forming Pulse Radio Signals with LFM Transformation
5
10.1615/TelecomRadEng.v60.i56.100
N. M.
Kalyuzhny
Kharkiv Military University
S. V.
Pshenichnykh
Kharkiv Military University
I.V.
Puziy
Kharkiv Military University
A.A.
Asanov
Kharkiv Military University
The task of eliminating random phase jumps on the adjacent discrete boundary is solved when forming radio pulses with the LFM transformation method. The filter method of eliminating the phase continuity violation, which provides preservation of coherence in a radiopulse being formed, is proposed. The results of the PC modeling are given.
The Efficiency of Data Transmission Systems with the Decision Feedback and Variable Parameters of the Correcting Code
10
10.1615/TelecomRadEng.v60.i56.110
V. N.
Zakharchenko
Popov Ukrainian State Academy of Communication
V. V.
Korchinsky
Popov Ukrainian State Academy of Communication
A. A.
Grin'
Popov Ukrainian State Academy of Communication
One of promising directions towards increasing the information transmission speed with the preset reliability is an adaptive change of the transmitted signal parameters depending on the current state of the channel. This article deals with the methods of calculating the optimum correcting code parameters in DT system with DF and variable transmission parameters.
Application of the Polynomial Maximization Method for Estimation of Signal Parameters Received by the Antenna Arrays
7
10.1615/TelecomRadEng.v60.i56.120
Y.P.
Kunchenko
Cherkasy State Technological University UA-18000, Cherkasy, Ukraine
T.V.
Prokopenko
Cherkasy State Technological University UA-18000, Cherkasy, Ukraine
In this work the method of the polynomial maximization at the estimations stage of signals parameters justified at observation of a random vector variable. The algorithms of finding of estimations of scalar and vector parameters of a random vector variable, and of property precision of received estimations are resulted in the work.
Selectivity Properties of the First and Second-Order Bragg Diffraction Components During Interaction of Light with a Transverse Ultrasonic Wave in Single-Axis Crystals
7
10.1615/TelecomRadEng.v60.i56.130
Ye.L.
Cherkashina
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077, Ukraine
Analytical expressions enabling one to perform a comparative analysis of selectivity characteristics of the first and second-order of the Bragg optical diffraction components on a transverse ultrasonic wave in a single-axis crystal are presented. Differences in the characteristics of spatial components are illustrated and the acoustooptical interaction parameters are terms of the required magnitudes of selectivity and diffraction efficiency of spatial components. It is shown that selectivity of second orders of diffraction is, to a larger degree, dependent upon the optical wave polarization as compared to that of first-order selectivity components.
Parameters Measurements of Semimagnetic Semiconductors by Means of the Electron Paramagnetic Resonance Method
10
10.1615/TelecomRadEng.v60.i56.140
S. Yu.
Karelin
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
The setup for measuring parameters of semiconductor compounds by means of the electron paramagnetic resonance method and measurement results of Cd1−xMnxTe-semimagnetic semiconductor parameters with the manganese concentration x varying from 0.1 to 0.45, have been represented.
Accuracy and Sensitivity of Surface Resistance Measurements of High-Temperature Superconductor Films Using Quasioptical Dielectric Resonators
7
10.1615/TelecomRadEng.v60.i56.150
A. A.
Barannik
O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
S. A.
Bunyaev
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
Nikolay T.
Cherpak
O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
The most probable measurement error analysis of the surface resistance Rs of high-temperature superconductor (HTS) films using quasioptical dielectric resonators has been carried out depending on the resonator main operating characteristics and dielectric properties. It has been shown that using the quasioptical dielectric resonator made of single crystal leukosapphire one can achieve the extremely low values of the measurement error and the most high measurement sensitivity of the surface resistance Rs at low temperatures. Numerical evaluations are presented for the 8-mm wavelength range. In partially, the minimal measurable value Rsmin (Rsmin < 1 μΩ at T < 4.2 K) based on the sapphire single crystal properties and operating characteristics of modern microwave network-analyzers has been obtained.
An Optimized Antenna for Plasma Generation in the ΠΡ-1 Facility
6
10.1615/TelecomRadEng.v60.i56.160
D. L.
Grekov
Institute for Plasma Physics at the National Science Center "Kharkov Institute of Physics and Technology" 1, Akademicheskaya St., Kharkiv 61108, Ukraine
N. A.
Azarenkov
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077; Institute of Plasma physics, 1, Academicheskaya St., Kharkov, 61108, Ukraine
A. A.
Bizyukov
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077; Institute of Plasma physics, 1, Academicheskaya St., Kharkov, 61108, Ukraine
V. P.
Olefir
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077; Institute of Plasma physics, 1, Academicheskaya St., Kharkov, 61108, Ukraine
The ΠΡ-1 facility a large source of homogeneous plasma intended for treatment of specimens of large diameters. A theoretical and experimental investigation of plasma generation in the facility by the HF fields excited by an annular antenna was performed in an earlier work. As was shown, radial currents in the antenna are more efficient to excite HF fields in the plasma, as compared with azimuthal ones. Results of analysis of a new antenna for plasma generation in the ΠΡ-1 facility are presented. Electromagnetic field distributions over the chamber volume are studied.
Joint Operation of Two-Level Resonant Tunnelling and Gunn Diodes
8
10.1615/TelecomRadEng.v60.i56.170
E. D.
Prokhorov
V. Karazin National University of Kharkiv, 4, Svoboda Sq., Kharkiv, 61077, Ukraine
O. V.
Botsula
V. Karazin National University of Kharkiv, 4, Svoboda Sq., Kharkiv, 61022, Ukraine
The operation of AlAs/GaAs two-level resonant tunneling and GaAs Gunn diodes which are series-connected in a resonance circuit, has been considered. The current-voltage characteristics of this kind of a diode combination have the following particularities: current jumping, regions being inaccessible for measurements in the current-voltage characteristics, shifts of current maxima to the region of larger voltages. On the current-voltage characteristics there are three regions with negative differential conductivity which can be used for generating in the millimeter wave band. The ratios of the parameters of the Gunn and resonant tunneling diodes join-operated, which provide the formation of three generation zones (two zones exist at the expense of resonant tunneling and one of them forms owning to electron intervalley transfer), have been determined. In these areas the generation efficiency has been estimated at the millimeter wave band.
Magnetostatic System for Electron Beam Control
5
10.1615/TelecomRadEng.v60.i56.180
V. I.
Afanas'iev
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
A construction of a small-size magnetic mirror is proposed for simultaneous deflection and focusing of an electron flow using the inhomogeneous magnetic field. The magnetic mirror consists of two samarium-cobalt disks and a paraboloid pole tip made of magneto-soft material. An axial component of the mirror magnetic induction is 180 mT on the pole tip surface.
Ultra-High Frequency Intense Pulse Electron Sources
7
10.1615/TelecomRadEng.v60.i56.190
M.I.
Ayzatsky
National Scientific Center "Kharkov Institute of Physics and Technology" 1, Akademicheskaya St., NSCKIPT, 61108 Kharkov, Ukraine
I.V.
Khodak
National Scientific Center "Kharkov Institute of Physics and Technology" 1, Akademicheskaya St., NSCKIPT, 61108 Kharkov, Ukraine
V.A.
Kushnir
"Accelerator" National Research Laboratory, "Kharkiv Institute of Physical Technology", National Research Center 1, Аkademichna St., 61108 Kharkiv, Ukraine
V. V.
Mitrochenko
"Accelerator" National Research Laboratory, "Kharkiv Institute of Physical Technology", National Research Center 1, Аkademichna St., 61108 Kharkiv, Ukraine
V. F.
Zhiglo
"Accelerator" National Research Laboratory, "Kharkiv Institute of Physical Technology", National Research Center 1, Аkademichna St., 61108 Kharkiv, Ukraine
The paper concerns the experimental research of the ability to generate intense pulse electron beams in S-band radio-frequency guns (RF guns) utilizing metal-dielectric cathodes. Results of calculations and design of the cathode experimental sample are described. Results of the experimental research of the RF gun operating modes are reviewed. The beam at the gun output has the pulse current of 3.5-4.5 A with the current pulse duration of 40-50 ns and with particle energy of 300 keV.