2009, volume 14, № 3
EXCITATION OF MAGNETIC FLUX INDUCTION INSIDE A MAGNITODIELECTRIC CYLINDER
T. N. Ogurtsova, Yu. B. Sidorenko
259-266
The solution of the problem of measuring the magnetic flux induction, induced by a flat wave inside the ferrite cylinder as a basic block of the highly sensitive magnetic antenna, has been considered. The problem of diffraction of the flat electromagnetic wave by the infinite circular magnitodielectric cylinder having an arbitrary radius was chosen as a model. Patterns of field distribution inside and outside the cylinder have been constructed. The resonance behavior of the magnetic flux induction has been noted.
EXCITATION OF MW TORCH DISCHARGE AT THE EDGE OF SINGLE-CONDUCTOR LINE
B. P. Yefimov, A. N. Kuleshov, M. O. Khorunzhiy, A. O. Puzanov
267-274
Experimental results of surface waves propagating along single-conductor Goubau line and exciting torch MW-discharge of erosion type have been presented. Two characteristic regimes of the line are described: the case when it works like spike antenna and the case when it transmits MW-energy via surface plasmon-polariton to the load, which is MW-plasma. The description of MW set-up features and additional elements for transmitted energy measurements in set-up external circuit are given. The prospect of Goubau line application as transmitting line of MW energy in wide frequency range and also several possible practical applications of the line in new material processing and semiconductor devices development have been discussed.
RADIALLY TWO-LAYERED SPHERE AS PERMITTIVITY SENSOR OF SURROUNDINGS
A. Ya. Kirichenko, Yu. V. Prokopenko, O. A. Suvorova, Yu. F. Filippov
275-281
The availability of radially two-layered sphere resonator as permittivity sensor of surroundings is studied. Expressions for electromagnetic fields components of eigenmodes and characteristic equations of a resonator are given. In centimeter wave band, the numerical calculations of the resonator with quartz inner layer and polikor external layer are made at its placement into different surroundings. It is shown the sensitivity of the frequency variation to the permittivity variation of surroundings is determined by the external layer thickness.
ON DISTRIBUTION OF THE FORCED WHISPERING GALLERY MODES FIELDS EXCITED IN THE OPEN DIELECTRIC RESONATORS BY THE COUPLING SLOT IN TNE METAL PLANE
R. V. Golovashchenko, E. V. Goroshko, A. Ye. Kogut, V. V. Kutuzov
282-285
The results of the experimental investigations of the spectral and field characteristics of the forced whispering gallery modes excited in the open semidisk dielectric resonators by the local coupling element as the slot in the metal mirror of resonator are shown. The obtained results are carried out by the computerized measuring apparatus. It is shown that the electromagnetic characteristics of the forced oscillations of the dielectric resonators depend not only on the energy losses from the coupling element but on the radiation. The value of such radiation losses depends on the conditions of the modes excitation.
INPUT IMPEDANCE OF A PROBE-FED CYLINDRICAL MICROSTRIP ANTENNA WITH ARBITRARILY SHAPED PATCH
А. Ye. Svezhentsev
286-294
A cylindrical microstrip antenna fed by a coaxial line (probe) is considered. The probe is modeled by a finite-size electric current filament. The problem is solved by the method of moments in the spectral domain. Sub-domain basis functions are introduced, which substantially expands a class of solvable problems, including arbitrarily shaped patch antennas. The return loss versus frequency is presented for an E-shaped patch antenna.
DISPERSION CHARACTERISTICS OF BOUND DIELECTRIC WAVEGUIDES WITH DIFFERENT DIELECTRIC CONDUCTIVITY
S. A. Provalov
295-298
The results of experimental research on the dispersion characteristics of bound dielectric waveguides with different dielectric conductivity in millimeter waveband are given. It is shown that the use of dielectric waveguides with different steepness of dispersion dependencies allows to obtain a system in which one of the allowable oscillations has a small gradient of dispersion dependence. The obtained results can be used for development of EHF functional elements.
DEVELOPMENT OF RADAR OBSERVABILITY PREDICTION METHODS OVER SEA SURFACE IN IRE NAS OF UKRAINE
V. K. Ivanov, V. M. Shalyapin, Yu. V. Levadnyi
299-314
The present review describes stages of the investigation development on one of main scientific directions of Institute of Radiophysics and Electronics of NAS of Ukraine – the forecast of radar observability. The first expeditions, which were carried out by the institute members on the Black and Baltic seas in 50-years, gave a possibility to obtain interrelationship between radar observability and meteorological factors along radio wave propagation path. It was found reason of “radar holes” – sharp field decreasing due to shielding action of elevated inversion layers, which had strong effect on radars, radio communication and radio navigation systems. The results of these investigations were the base for the strategy of radar observability prediction and composition of radio climatic characteristic of the seas.
Complex investigations of conditions of radio wave propagation over the World Ocean in the 70s and 80s allowed to create a bank of radio meteorological parameters necessary for designing and operation of radars. The radar observability prediction system for over water and air targets and the application package for the field strength calculations using meteorological data have been developed.
MODELLING OF ELEVATION ANGLES MEASUREMENTS OF LOW-ALTITUDE TARGETS BY MULTIFREQUENCY RADAR WITH USE OF OFF-AXES TECHNIQUE
Yu. A. Pedenko
315-322
The computer simulation for measuring elevation angles of low-altitude targets above the rough sea surface has been carried out by means of three-frequency monopulse radar with use of off-axes technique. The dependence of statistical characteristics of angle error versus frequency spacing is investigated at various excitements of the sea and phase ratio between a direct and specular signal from the target. It is shown that the increase of number of working frequencies of the monopulse radar using off-axes technique, up to three, allows to reduce essentially elevation angle errors of the low-altitude targets.
Taking into account small droplets in rain drop size distribution function for terahertz wave range
Yu. I. Malyshenko, A. N. Roenko
323-330
The probability density distributions of rain drop sizes, widely used in calculations of rain attenuation statistics for microwave radar and communication systems, are analyzed. It is shown that the majority of these distributions sufficiently poor describe the real quantity of the rain small droplets. New more adequate distribution function, which takes into account small droplets and may be used in frequency ranges up to terahertz one, is proposed
RESEARCH ON MICROWAVE BACKSCATTERING FROM SURFACE LAYER IRREGULARITIES
V. A. Mironov, S. I. Khomenko, G. I. Khlopov
331-336
In the paper the radar backscattering from angel-echo is considering, as well as peculiarities of radar images at radar monitors, seasonal and daily trends of their appearance and radar detection probability. It is noted that the more temperature and humidity of an atmosphere – the higher the probability of angel-echo detection. More over, speed of angel-echo movement not always correlates with the speed and direction of wind. Spectrum width and Doppler frequency shift exceed the same characteristics of signals, reflected from rough sea surface.
TRANSITION RADIATION OF MODULATED ELECTRON BEAM TRAVERSING THE WIRE SCREEN
Yu. O. Averkov, V. M. Yakovenko
337-343
The transition radiation of an electron beam traversing the wire screen has been theoretically investigated. The beam has the form of the periodical series of discrete bunches and moves along the normal to the screen. Each of the bunches by itself has the form of the segment of the charged filament which is directed normal to the beam velocity. The wire screen is located in vacuum and has the form of a one-dimensional array of parallel metal wires. Two different mutual arrangements of the bunches and the wires, namely, the perpendicular and the parallel arrangements have been considered. The spectral energy density, the directional diagram, and the numerical estimations of the radiation power have been obtained. It has been demonstrated that the transition radiation is the series of harmonics. The harmonic frequencies are multiple of the reverse spatial period of the modulated beam. The directional diagram has maximum along the wires for the non-relativistic coherent bunches.
PECULIARITIES OF LONGITUDINAL SOUND PROPAGATION IN IRON BORATE. AZIMUTH DEPENDENCIES
V. I. Khizhnyi, V. V. Tarakanov, A. P. Korolyuk, T. M. Khizhnaya, M. B. Strugatsky
344-349
Evolution of magneto-field dependencies of amplitude-and-phase transmission coefficient for 180 MHz longitudinal ultrasound in iron borate platelet under direction variation of external magnetic field in base plate of crystal is experimentally studied.
MICROWAVE REFLECTION IN RECTANGULAR WAVEGUIDE FROM CONDUCTIVDE SAMPLES LOCATED ON INCLINED FLANGE WITH MICROCHANNEL
S. I. Taraban, A. I. Gubin, A. A. Lavrinovich, N. T. Cherpak
350-357
Microchannel effect in inclined flange to the reflection coefficient from samples with various conductivity located on flange has been investigated. By means of numeric modeling and experimental investigation decrease of microchannel effect by using rectangular groove in inclined flange has been shown.
EMISSION characteristics of Oxazine dyes INCORPORATED in solid polyurethane matrices
S. V. Nikolaev, V. V. Pozhar, M. I. Dzyubenko
358-365
Energy and spectral emission characteristics of cylindrical polyurethane matrices, doped by Oxazine 17 and Oxazine 1 dyes were investigated. The influence of induced thermo-optical distortions arising in the conditions of application of transverse mode pumping on energy and emission spectrum was studied. The highest values of energy and efficiency, obtained of the two-centimeter matrices made up: for Oxazine 17, correspondingly, 52 mJ and 18 %, and for Oxazine 1 an 120 mJ and 23 %. The conclusion is made that the polyurethane media doped by these dyes, are a perspective material for creating solid-state laser active elements capable to work in the conditions of powerful microsecond pumping.
On analytic representation of electric field created by charges induced by non-relativistically moving charges on cylindrical waveguide wall
K. Ilyenko, T. Yu. Yatsenko
366-370
We obtain an analytic representation of the electric field, which is created by the charge density induced on the grounded ideally conducting cylindrical drift tube wall by a non-relativistically moving charge. The angle variable integration in the initial formulation is reduced to two known quadratures (complete elliptic integrals of the first and second kind) and to calculation of two finite sums with the coefficients that are functions of a single uniform variable. A recurrence relation, which allows one to perform the angle integration, is proved. The sums calculation, accomplished beforehand on the known space mesh of drift tube, can substantially reduce the computation time required for an essentially 3D calculation of transport of a charged beam by the particle-in-cell method. As an example of the proposed technique, we find a representation of electric field on the system axis induced by such a charge density distribution, which contains only fast convergent series.
MODELLING OF GENERATION OF TRAINS OF PULSES IN A PARALLEL CONNECTION OF DELAY LINES WITH GUNN DIODES
L. V. Yurchenko, V. B. Yurchenko
371-377
Time-domain modeling of active systems of Gunn diodes connected in parallel with sections of microstrip delay lines has been carried out. Complex dynamics of electromagnetic field radiated into an infinite open section of microstrip line has been observed. In a system with a remote resonator, when active blocks are separated from the resonator by extended sections of microstrip line, a possibility of generation of trains of high frequency pulses has been shown. Quasi-chaotic signal generation is shown to be possible in a system with parallel connection of a few branches of different length.
TO QUESTION ABOUT CHOICE OF TYPE OF SECONDARY-EMISSION CATHODE FOR MILLIMETER WAVE MAGNETRON
V. D. Naumenko, O. M. Suvorov, V. O. Markov, A. E. Moiseenko, R. V. Naumenko
378-382
The results of study of the long-term operation of 95 GHz magnetrons with the secondary-emission cathodes of different types are expounded. It is shown that, in spite of large influence of operations magnetron mode on secondary-emission properties of cathode, continuous (thousands of hour) magnetron working capacity can be well-to-do not only with platinum but also with other types of cathodes.
THE CUBIC-NONLINEAR THEORY OF A PLASMA-BEAM SUPERHETERODYNE FREE ELECTRON LASER WITH H-UBITRON PUMPING
V. V. Kulish, A. V. Lysenko, V. V. Koval
383-388
The multi-harmonic cubic-nonlinear theory of a plasma–beam superheterodyne free electron laser with H‑ubitron pumping is constructed. The multi-harmonic interaction of waves, which, as it is found out in the work, plays an essential role, is considered. The analysis of the saturation levels is carried out. It is found that prospects of practical use of the considered systems for generation of especially powerful electromagnetic signals of the mm range could be rather promising.
THE HARDWARE-CALCULATED SYSTEM FOR MEASUREMENT LOW AND HIGH QUALITY RESONATORS CHARACTERISTICS AT THE FREQUENCY RANGE FROM 26 GHZ TO 37.5 GHZ
V. N. Skresanov, V. V. Glamazdin, A. I. Shubny, Z. E. Eremenko
389-400
The results of hardware - calculated system (HCS) design for measurement of resonators characteristics with quality-factor from hundred units up to hundred thousand at the frequency range from 26 GHz to 37.5 GHz are presented. The measurements are based on the registration and processing of amplitude vs. frequency characteristics (AFC) of resonators. The calculation methods of loaded quality, resonant frequency, relative amplitude of fluctuations and the level of constant component of the signal, and also the shift of phases between them on factors of approximation of the resonator AFC by fractional-rational function are proposed. It is shown, how using the factors of approximation of AFC of the reflection coefficient from the resonator the eigen quality-factor and the part of signal scattering power in a coupling element can be calculated. The results of tests are presented at study of resonators with low- and high-quality factors.
THE MEASUREMENT AND HANDLING ALGORITHMS OF PHASE SCATTERING DIAGRAMS IN THE MANY CHANNEL AUTOMATED SYSTEM OF QUASIOPTICAL MICROCOMPACT RANGE
S. V. Mizrakhy
401-404
The results of developing the measurement and handling algorithms of phase scattering diagrams in the many channel automated system of quasioptical polarimetric microcompact range are presented. It is used for realizing the quasioptical waveguide modeling method. The program algorithms and testing results describing the complex possibilities are presented.