2006, volume 11, № 3
INFLUENCE OF RANDOM BULK IMPERFECTIONS ON THE MICROWAVE QUASI-OPTICAL RESONATOR SPECTRUM.
II. EXPERIMENT
Ganapolskii E. M., Eremenko Z. E., Tarasov Yu. V.
331-338
The influence of random imperfections on the quasi-optical cavity cylindrical resonator spectrum was studied experimentally at millimeter wave band. The obtained data are agreed well with the spectral statistical theory of a cavity resonator with random imperfections, which was developed in the previous paper. The results of experiment confirm that the main mechanism of this influence is the intermode scatterng which reveals itself by the frequency shift and widening resonant lines. According to the theory, the scattering effect reaches maximal value when frequency interval between the adjacent resonant lines is minimal. The solitary lines almost are not changed by the influence of small imperfections. As a result of such a selective influence of imperfections, the spectrum of the resonator is rarefied. We found out that there are both the regular and the chaotic properties in the quasi-optical resonator with random imperfections. The obtained experimental results can be the basis for modeling the influence of random imperfections on the electron spectrum of closed nanoelectron structures (quantum dots and quantum billiards).
AZIMUTH OSCILLATIONS IN THE COMPOSITE DISK DIELECTRIC RESONATOR
Kirichenko A. Ya., Martynyuk S. P., Motornenko A. P., Skuratovskiy I. G.
339-343
Peculiarities of the eigen high azimuth electromagnetic oscillations for the composite disk dielectric resonator which consists of two disks of the different diameters located coaxial one on another have been investigated. The disk with the major diameter was made from the dielectric with the minor permittivity. It was demonstrated that the eigen resonance frequencies and Q-factors can be controlled by the thickness variation and the material choice of the auxiliary disk with the major diameter. The influence of the strongly absorbing liquid located in resonator on the its resonance characteristics has been studied.
THE ANALYSIS OF A BIG MICROWAVE CAPACITY TRANSFER OPPORTUNITY IN THE METAL-DIELECTRIC WAVE GUIDES IN A TERAHERTZ RANGE OF FREQUENCIES
Goroshco A. I.
344-347
The comparative analysis of various metal-dielectric wave guides (MDWG) on attenuations and possibility of heat caused by the microwave energy losses removal and also on electric durability are carried out. The possibility of transfer on the MDWG of a continuous microwave power in several MWt in terahertz range is shown.
FORMATION OF THE UNIFORM FIELD IN THE WAVEGUIDE QUASIOPTICAL RESONATOR WITH SPHERICAL CONVEX REFLECTOR
Volodenko A. V., Gurin O. V., Degtyarev A. V., Maslov V. A., Svich V. A., Topkov A. N.
348-352
A description of a method of forming in a waveguide quasioptical resonator, non-Gaussian light beams with a uniform intensity distribution is given. The mеthod is based on the coherent summation of transverse waveguide modes due to change of radius of curvature for one of mirrors. The theoretical model and calculation algorithm for characteristics of the basic mode with the uniform intensity distribution on the resonator output mirror with use of a method of eigenmodes are developed. The conditions of such mode existence and the stability of its characteristics are established by changing the parameters of spherical reflector and the waveguide geometry.
AMPLIFICATION OF THE MULTIFREQUENCY SIGNAL IN COAXIAL SLOW-WAVE STRUCTURE
Galaydych K. V., Markov P. I., Sotnikov G. V.
353-359
The nonlinear analysis of amplification of a wide packet of monochromatic electromagnetic waves by an electron beam in slow-wave structure with a wide range of a linear dispersion is carried out. The slow-wave structure represents a coaxial transmission line with disks on internal and external conductors. Distribution of amplitudes of the electric fields average on cross-section of structure, as function of longitudinal coordinate of structure has been investigated. Dependence of characteristic maximal values of waves excited in slow-wave structure on energy of an electron of a beam is found. It is shown, that in slow-wave structure, changing energy of an electron of a beam, it is possible to control a spectrum of an output signal. At one values of energy probably greatest simultaneous amplification of all waves at the certain value of length of structure, and at other values of energy, total power of an output signal has the maximal value, but its spectrum is determined by small number of monochromatic oscillations.
ON THE OSCILATIONS IN THE DISK DIELECTRIC RESONATORS
Golovashchenko R. V., Derkach V. N., Prokopenko Yu. V., Smirnova T. A., Tarapov S. I., Filippov Yu. F.
360-365
A comparatively good agreement between theoretical and experimental results of investigations of a disk dielectric resonator made from the fused and crystalline quartzes was obtained. The spectral and energy characteristics have been studied using an electrodynamic analysis of the resonator model with the ideally-conducted plane surfaces.
CHARACTERISTICS OF AN OPEN RESONATOR EXCITATION BY THE SYSTEM OF ELECTRIC DIPOLES
Bulgakov B. M., Natarov M. P., Skresanov V. N.
366-371
The model of an open resonator excitation by the system of electric dipoles has been considered. The model is based on the presentation of an open resonator field as the superposition of Hermit-Gauss modes. The amplitude spectrum and the excitation efficiency have been calculated for some cases of dipoles location. It has been found the conditions of the increase of the excitation efficiency for cases of dipole arrays in comparison with one dipole.
METHOD OF FRACTIONAL OPERATORS IN PROBLEM OF EXCITATION OF THREAD OF ELECTRIC CURRENT ABOVE PLANE BOUNDARY
Ivakhnychenko M. V.
372-376
Fractional fields, obtained as a result of applying
fractional curl operator 
to known solution of classic problem of
excitation of two-dimensional source above plane boundary, are analyzed.
Fractional fields describe fractional or intermediate solutions of considered
problem. It is shown that fractional solutions corresponds to anisotropic and
bi-anisotropic boundaries of special kind and can be used as intermediate cases
between perfectly electric and magnetic conducting boundaries.
LOW ALTITUDE RADAR TRACKING OVER SEA SURFACE
Razskazovsky V. B., Pedenko Yu. A.
377-384
The statistical computer simulations of two techniques for radar low-altitude target elevation angle estimation - monopulse and off-axis - in conditions of multipath propagation over the rough sea surface has been executed. The main attention at modeling is given dependences of errors of elevation angle estimation versus a phases difference between direct and specular reflection signals from the target. It is marked, that at use of a monopulse technique on some sites of a difference of phases arise it is anomalous high fluctuations of errors of elevation angle estimation and the conditions promoting lost of target tracking are created. The phases differences between the direct and specular reflect signals on these sites differs from values appropriate to a minimum or a maximum of the inteferense structure of the field, referred to the centre of receiving radar antenna. It is shown, that use in similar conditions of the off-axis technique excludes lost of tracking and essentially, up to several times, reduces estimation elevation angle errors.
FEATURES OF PROCESSING OF SIGNALS AT SUBSURFACE RADAR PROBING IN DISPERSIVE MEDIUM
Sugak V. G.
385-392
The distortions of signals appearing at subsurface probing in dispersive medium, caused by functional dependence of phase speed of propagation of radiowaves on frequency are considered. The method of compensation of these distortions is offered, allowing essentially to increase depth resolution of a probing signal with step-by-step frequency modulation.
PROPAGATION FACTOR DISTANCE DEPENDENCIES IN METER, DECIMETER AND CENTIMETER WAVE RANGES IN THE REGION OF THE WORLD OCEAN
Mytsenko I. M.
393-399
Almost every sea-going vessel is equipped with navigation, communication and other radio tools providing the sailing safety and basically operating at microwave band. In developing such devices and calculating of the power potential it is necessary to provide for required range, signal attenuation on a radio path. The basic parameters of radio path are the radio-wave attenuation factor V and its distance dependence V(r) [1]. Because of a great variety of synoptic factors influencing radio signal attenuation above the ocean surface as well as lack of systematic experimental data, multiyear complex radiophysical investigations in the different areas of the Atlantic, Indian, Arctic and Pacific Oceans by IRE NAN of Ukraine have been carried out. In this work the distance dependences and its occurrence probabilities in different areas of the World Ocean are presented. Differences of radio-waves propagation above the ocean surface and land are noted.
ESTIMATION OF RADIO WAVE PROPAGATION CONDITIONS ABOVE SEA SURFACE ON RADIOMETRIC MEASUREMENTS AT GRAZING ANGLES
Kabanov V. A.
400-403
Grounding on conducted researches [1] the method of estimation radio wave propagation conditions above sea surface is proposed. The method is based on radiobrightness temperature measurements at grazing angles. The parameters of radiobrightness temperature elevation profile on vertical polarization well correlating with radio wave propagation conditions on beyond the radio horizon paths are used for estimation. As far as the relative measurings are used the requirements to radiometer stability are reduced.
IMAGING WITH THE HELP OF NOISE WAVEFORM SAR IN THE NEAR ZONE OF RADIATOR
Vyplavin P. L., Lukin K. A., Kolchigin N. N.
404-408
Operation of the synthetic aperture radar (SAR) in the near zone of radiator is analyzed. A SAR imaging algorithm accounting near zone fields is described. Besides that results of modeling of noise waveform SAR operation in the near zone of horn radiator are presented. Modeling enabled to analyze differences in the images obtained with the given algorithms.
THE IONOSPHERE PARAMETERS DETERMINATION ON SPACE WEATHER VARIATIONS
Tcherniak Y. V., Lysenko V. N.
409-415
The method incoherent scatter of radio waves allows to determine experimentally both regular variations of the basic parameters ionosphere, and their behavior during perturbation of various origin. The parameters determination technique of a quiet ionosphere bases on the certain premises: the temporary variations of parameters is passed slowly, the main maximum of electron density (Ne) is distinct, at heights of topside ionosphere plasma density is exponential decreases with a height increment. During perturbations, the dependence between scattering cross-section and ionosphere parameters is retained, but altitude and temporary dependence of dispersing medium correlation function can differ from these in undisturbed conditions. During a main phase of ionosphere storm can be observed “coherent echo”, reconfiguration of F2 layer, that changing altitude dependence of plasma parameters. It has result to modification of ionosphere parameters determination technique in ionosphere perturbations conditions. Results of experimental measurements during magnetic storms 30.05.2003 and 9-10.11.2004 are described. Altitude dependences of correlation and spectra function, cross section and drift velocity of ionosphere plasma, time-altitude distributions of scatter signal power are presented. The comparison of obtained results and matching with space weather characteristics is made.
ONE-DIMENSIONAL MAGNETOPHOTONIC CRYSTAL OF MILLIMETER WAVEBAND SIMULATING
Chernovtsev S. V., Tarapov S. I.
415-420
Results of experimental and theoretical studies of the ferrite based magnetic multilayered periodic structure’s (a model of one-dimensional magnetophotonic crystal) spectral properties versus the external static magnetic field are presented. The possibility to control spectral properties of such structure by magnetic field is shown. It is revealed, that varying of the spectrum by the external magnetic field is caused by the dispersive properties of ferrite. Using of such structures as a tunable filter of a millimeter waveband is offered.
INP1-X(Z)ASX(Z) VARIBAND GUNN DIODES OF WITH DIFFERENT CATHODE CONTACTS
Storozhenko I. P.
421-429
Physical phenomena of the transfer electron effect in Gunn diodes on the based InP1-x(z)Asx(z) variband semiconductor compounds with n+-n and n+-n--n cathode contacts at different active region length and variband layer thickness has been done. It has been proved that InP1-x(z)Asx(z) diodes output power and efficiency oscillation in all frequency range exceed of diodes on the base of the InP1-xAsx spatially homogeneous composition semiconductor alloy at the x = 0…0,4.
DIFFRACTION RADIATION OSCILLATOR IN MILLIMETER WAVEBAND, OPERATED AT LOW VOLTAGE
Miroshnichenko V. S., Demchenko M. Yu., Lopatin I. V., Senkevich Ye. B., Tishchenko A. S.
430-435
The prospects of decrease of an accelerating voltage and power consumptions for vacuum sources of diffraction radiation are considered. The estimation of a starting current for the low-voltage diffraction radiation oscillator (DRO) is carried out. The features of design of the optimized electrodynamical system and results of experimental researches of the output characteristics of DRO in 5-mm waveband, working at accelerating voltage 600-1000 Volt and power consumption no more than 70 Watt, are presented.
CURRENT-VOLTAGE CHARACTERISTICS’ WIDTH OF ALXGA1-X N
Pavlenko D. V., Prokhorov E. D.
436-439
Impact ionization in GaN, AlN and their combination is considered, the current-voltage characteristics width and voltages enough for impact ionization development in Gunn diodes made of GaN, AlN and their combinations are defined.
DISPERSION RELATION FOR A HYBRID PLANAR UBITRON
Goryashko V. A., Ilyenko K. V., Opanasenko A. M.
440-446
In the linear in the microwave field approximation the dispersion relation for an arbitrary waveguide loaded with a thing electron beam moving in external spatially-periodic magnetostatic field of a planar ubitron and uniform guide magnetic field is obtained. Non-perturbed electron trajectories are found as solutions to a non-linear system of equations via an asymptotic expansion in the small ratio of the amplitude of the undulator magnetic field to the magnitude of the guide magnetic field. As solutions to the traveling wave amplification problem, we calculated the amplification band, spatial growth rate and made an efficiency estimate taking into account magnetostatic resonance.
UNIVERSAL LABORATORY MAGNETIC SYSTEM FOR UHF DEVICES
Kuleshov A. N., Zavertaniy V. V., Karpenko V. I., Yefimov B. P.
447-450
Experimental research results on the development of magnetic system with both longitudinal magnetic field with high homogeneity on whole system length and homogeneous longitudinal magnetic field with parts of slow increasing field on the system edges have been presented. It is shown that many sectional solenoid systems placed in magnetic core are favorable in the creation of magnetic field length 270 mm with inhomogeneity less then 5 %. The dependences of magnetic induction on current for both whole magnetic system and its sections are also given.
PRECISION CONTROL OF FREQUENCY IN MILLIMETER BAND ESR SPECTROMETER
Varavin A. V., Ermak G. P., Nedukh S. V., Poznahirev P. I., Tarapov S. I., Khodzitskiy M. K.
541-455
Results of design of the frequency synthesizer for
millimeter band ESR spectrometer are described. Adjusting of the output signal
frequency is realized by the reference digital synthesizer, which is controlled
by the computer or the remote-control unit. The long-time frequency instability
of the generated frequency is not worse than 
; the minimal step of frequency tune-out is 10 Hz. The high operating
characteristics of the device are demonstrated at the registration of
ESR-response of the control sample.
USE OF WIDE-ANGLE OPTICAL SYSTEM FOR ANALYSIS OF CAPILLARY WAVES IN LIQUID
Uzlenkov А. V.
456-466
The optical system for estimation of capillary waves on surface of liquid is offered. The physical features of functioning of the offered system are considered in this appendix, limitations of applicability are certain. The results of the numerous and experimental research of the optical system are shown. Frequency and dynamic properties are appraised. A high sensitivity to the presence of surface-active-substance is marked.
THE STUDY OF HEAT INDUCED TRANSITIONS BLOOD SERUM PROTEINS OF THE PREGNANT RATS UNDER CONTAINING CALCIUM DRUGS EFFECT BY EHF DIELECTROMETRY METHOD
Ruzhelnyk E. A.
467-470
In this work the heat induced transitions of blood serum proteins of pregnant rats was investigated under containing calcium drugs effect in vivo and calcium addition in vitro by method of EHF dielectrometry. The influence of small amounts on the conformational state of blood serum proteins was detected. Our results have shown that use EHF dielectrometry is perspective method for investigation calcium metabolism processes on clinical materials of patients. It is also possible for substitution in vivo for in vitro.