2004, volume 9, ¹ 2
DIFFRACTION OF H10-MODE WAVE ON STEPPED JUNCTION OF TWO RECTANGULAR WAVEGUIDES WITH IMPEDANCE SLOT IRIS
Nesterenko M.V., Katrich V.A., Penkin Yu.M.
325-334
The approximate analytical solution of the problem of the base mode diffraction on the impedance slot iris of finite thickness has been obtained. The iris is situated on the plane of the stepped junction of two rectangular waveguides. It is proposed that narrow rectilinear slot coupling aperture of semi-infinite waveguide sections of different cross-section was cut in the iris at which one (or two) surface is characterized with constant distributed impedance. The solution is based on the induced MMF method and Greens’ function method for vector potentials. The scattering matrix coefficients for asymmetrical H-plane junctions of two waveguides with impedance slot irises was studied.
BROADBAND MATCHERS OF RECTANGULAR WAVEGUIDE WITH TRANSVERSE DIELECTRIC LAYER
Shcherbak V.V.
335-340
We solve a problem about broadband matching of the rectangular waveguide with a thin dielectric layer (for optimization of vacuum windows of microwave devices). In strict statement we analyze wave scattering on such layer with discontinuities, which are compensator of his reactivity. We compare efficiency of different types of compensators: strip-type and of stepwise type, with longitudinal and transverse symmetry and of the other species. We analyze also influence of unideality factors.
FREQUENCY-SENSITIVE PROPERTIES OF MULTI-ELEMENT SCREEN WITH RECTANGULAR WAVEGUIDE CHANNELS
Gribovsky A.V., Prosvirnin S.L.
341-346
The frequency characteristics of reflection coefficient of electromagnetic wave for conducting multi-element screen with periodically placed rectangular perforations are presented in this report. Conditions of full resonant transmission of electromagnetic wave by symmetrical and non-symmetrical “closed modes” in waveguide channels are studied.
AN EXCITATION BY A PLANE WAVE OF A CYLINDRICAL MICROSTRIP ANTENNA PLACED ON AN ELECTRICALLY LARGE METAL CYLINDER
Svezhentsev A.Ye.
347-355
A problem of a cylindrical microstrip antenna excited by a plane wave is discussed in the case when the cross-sectional size of an antenna is bigger than wave length. The solution is obtained by the moment method using an improved representation of the Green’s function adapted to the case of an electrically large cylinder. In this representation a leaky wave contribution is added to previously extracted a singularity at the origin and a surface wave contribution which have been obtained in a quasi-analytical form. A resonance is found. Far field is calculated.
THE RESEARCH OF SMALL-SIZED AXISYMMETRICAL DIPOLE ANTENNA ARRAYS OF CIRÑULAR POLARIZATION
Ovsyanikov V.V.
356-360
The results of research of characteristics of small-sized axisymmetrical radial and azimuthal dipole antenna arrays are presented. For reducting of the sizes of antenna arrays the concentrated inductive elements inserted in gaps of radiating branches of vibrators are used. The calculation of antenna arrays is carried out in two basic stages. At the first stage value and coordinates of insertion of inductive elements are defined in initial approximation by a method of an equivalent long line. At the second stage the received electric parameters of the antenna arrays are analyzed by a method of the integral equation and values of inductive elements and coordinates of their insertion are optimized by minimization of some object function.
THE BUILDING OF STRUCTURE FUNCTIONS OF ELECTROMAGNETIC INTERACTION FOR RESONATOR WITH THE RESONANT MAGNETODIELECTRIC SPHERES
Kozar A.I.
361-371
There looked through the way of building the structural function of electromagnetic interaction for resonator with the resonant magnetodielectric spheres. Received the expressions of tensor functions of electromagnetic interaction of magnetical and electrical type for resonator with the spheres. The analysis of expressions for structural functions was held as well.
OPTIMIZATION OF A WAVEGUIDE WITH A CORRUGATED FLANGE ON THE BASIS OF GENETIC ALGORITHMS
Kirilenko A.A., Steshenko S.A.
372-377
The accurate two-dimensional mathematical model of radiation of the H-polarized wave from a waveguide with a corrugated flange has been built. Grooves of arbitrary rectangular profile are symmetrically cut of about the waveguide axis. This structure can be considered as the two-dimensional model of the surface-wave antenna with a slow-wave structure having finite number of grooves. The problem of synthesis of the narrow beam width with given side lobe level has been solved with use of genetic algorithms.
THE INFLUENCE OF THE IMMERSION OF HEMISPHERIC DIELECTRIC RESONATOR IN LIQUID ON THE WHISPERING GALLERY MODES AMPLITUDES
Golubnichaya G.V., Kirichenko A.Ya., Kogut A.E., Kutuzov V.V., Maximchuk I.G., Solodovnik V.A.
378-382
The dynamics of HF signal changing traveling through the hemispheric dielectric resonator (e1) when the last was immersed in liquid with e > e1 is investigated. It was found that H-type resonator’s oscillations attenuates more weakly than such E-type at the same depth of immersion. It may be explained by the different field distribution along resonator surface for that types of oscillations. And point out the possibility to use H-type oscillations for investigation the electric properties of liquids with large values of e and tan d.
LINKS OF SCHUMANN RESONANCE INTENSITY WITH AVERAGE GLOBAL LAND TEMPERATIRE
Sekiguchi M., Hayakawa M., Hobara Y., Nickolaenko A., Williams E.
383-391
We present the results of correlation studies of the Schumann resonance intensity recorded in Japan from November 1998 to May 2002 and of the global soil temperature for the same period of time. The Schumann resonance intensity is shown to vary correspondingly to the average land temperature in the latitude belt ±45°: the correlation coefficient is equal approximately to 0.9. Reciprocity of seasonal variations reduces when the latitude interval is decreased. When the interval is greater that ±45°, the cross - correlation coefficient remains large, but does not substantially increase. The analysis of principal components (APC) was applied to extract annual, semi-annual and inter-annual variations. Similarity of electromagnetic and temperature records becomes especially obvious when examining variations of their principal components.
FEATURES OF ELECTROMAGNETIC FIELD STRUCTURE NEAR MEDIUM SECTION BOUNDARY STIPULATED DUE TO INHOMOGENATED OBJECTS
Sugak V.G.
392-399
On the basis of numerical methods of calculation of electromagnetic field in local regions with surface section boundaries of mediums having difference electrical constants it is investigated the structure and features of fields, radiated by dipoles system, located near section boundary. It is shown that the method can be applied at investigation of outcomes of subsurface probing in tasks of engineering geology, hydrogeology and ecology.
RADIOEMISSION CAUSED BY A TRANSVERSE CURRENT OF CHARGED PARTICLES OF EXTENSIVÅ AIR SHOWER
Filonenko A.D.
400-404
In the work a not investigated earlier mechanism of generation of electromagnetic pulse, caused by a break of quasistationary transverse current of electrons in extensive air shower is considered. Some important to the radio detection method properties of emission field have been investigated.
MICROWAVE BANDPASS FILTER BASED ON YBCO THIN FILMS
Korotash I.V., Tarasov V.F., Skoryk M.A., Lorenz M.
405-408
Microstrip band-pass filter on basis of YBa2Cu3O7-d thin films for frequency 1.7 GHz with bandwidth near 4%, high pass band edge steepness and low pass band losses was developed and investigated. The housing for HTS filter design features was considered. The encapsulated filter must provide cooling to the liquid nitrogen temperature. The behaviour of bilayer structure (a semi-infinite normal metal covered by superconducting YBCO layer) in microwave frequency range was investigated in dependence with superconductive layer thickness.
PHYSICAL PREREQUISITES TO THE PLASMA ANTENNA DEVELOPMENT
Novikov V.E., Puzanov O.O., Sin’kov V.V., Soshenko V.A.
409-412
The physical model has been suggested, the theoretical and experimental results establishing prerequisites to development of the plasma antenna have been represented. The properties of a plasma jet are researched; the experiments on its excitation by an electromagnetic field are carried out.
STUDY OF PERIODIC DUTIES OF LASING IN SINGLE- MODE SOLID-STATE LASERS
Kovalenko G.P., S.V.Kolomiets
413-420
Dynamics of semi-classical model of solid-state laser is studied by method of bifurcation of cycle initiation. The bifurcation analysis is conducted for quadratic, cubical and biquadratic dependencies of Q-switch of intensity of a photon flux. The criteria of stability of limiting cycles, which occur in consequence of Hopf’s bifurcation, are obtained, intervals of stability for control parameters are made.
ENERGY & FREQUENCY CHARACTERISTICS OF THE GANN DIODES ON THE BASIS OF SEMICONDUCTORS WITH LINEARLY CHANGING COMPOSITION IN ACTIVE ZONE
Arkusha Yu.V., Prokhorov E.D., Storozhenko I.P.
421-425
Gunn diodes on the basis of the different A3B5 variband semi-conductor alloys (Inx(z)Ga1-x(z)As, Alx(z)Ga1-x(z)As, InP1-x(z)Asx(z)) composition which linearly depend on the coordinate with the help of intervalley electron transfer two temperature model in the variband semiconductor have been studied in the wide range frequency. Critical generation frequencies, power and frequencies characteristics have been defined. The list of perspective A3B5 threefold variband semiconductor alloys for using Gunn diodes have been proposed.
FREQUENCY-STABILIZED SEMICONDUCTOR SOURCES OF ELECTROMAGNETIC OSCILLATIONS OF MM WAVELENGTH
L.V.Kasatkin, V.P.Rukin
426-436
There were investigated some ways of formation the frequency-stabilized sources of MM range on the base of semiconductor diode and transistor generators, working in self-oscillation range, frequency multiplication, synchronization by subharmonics’s signal. There were estimated relations of frequency similarity, which give the opportunity to estimate the accessible characteristics of frequency stability in wavelength range. Performed comparative analysis of stabilizing characteristics for diode and transistors’ sources of the investigated classes.
FLIGHT-PATH ANALYSIS OF CHARGED PARTICLE’S MOVE IN SPECIAL FORM OF ANODE VOLTAGE
M.A. Kopot’, Nikitenko A.N.
437-441
Theoretically, while applying the flight-path analysis in single-particle approach, there were investigated the possibility of receiving secondary electrons in devices of magnetron type with cool cathode. In dependence on the impulse form of anode voltage, one can receive the energy of initial electrons, which can be enough for an avalanche formation of secondary electrons.
QUASI-OPTICAL LAYERED BALL RESONATOR FOR MEASUREMENT OF HIGH LOSS LIQUID PERMITTIVITY IN MILLIMETER WAVE BAND
Eremenko Z.E.
442-451
The new method of measurement of high loss liquid dielectric permittivity in millimeter wave range is proposed. The method is based on the use of layered ball resonator with the measured liquid outside of the layered ball. The spherical dielectric layer between the liquid and the ball is used to dose of the losses in the resonator. The characteristic equations for eigen resonator frequencies are obtained and studied numerically. The electromagnetic field distributions in the resonator are obtained. The spectral resonator characteristics are studied. The resonance frequencies and resonator Q-factor are calculated at the measured liquid parameters' deviation. The resonator properties to measure high loss liquid permittivity are found out. The optimal resonator's sizes and the operating oscillation mode are obtained to provide the maximal sensitivity for measurement of the liquid permittivity.
ÒHÅ FEATURES OF RADAR DEVELOPMENTS FOR PEOPLE DETECTION UNDER OBSTRUCTIONS
Vyazmitinov I.A., Myroshnychenko Y.I., Sytnik O.V.
452-462
In the article are motivated the main requirements to the radars’ features from standpoint of conditions of the wave spreading on short, lumpy or composition route, so there are considered problems of the choice of the radar station structures, intended for finding the alive people under blockages of buildings. Complex conditions in which it is necessary to work to systems of a similar sort causes the requirements to radars signals. Presence of multiplicate handicaps complicates creation of optimum algorithms of processing of echo - signals. Application of signals with the big base and a complex kind of modulation demands creation of the hardware means providing precision accuracy of formation and processing of a signal. Merits and demerits of various variants of construction of block diagrams of radars for detection of people under blockages are discussed. Results computer simulation are given.
A THERAHERTZ QUASI-OPTICAL POLARIZATION PHASE SHIFTER WITH THE CRYSTAL QUARTZ PHASE SECTIONS
Bezborodov V.I., Kiseliov V.K., Kuleshov Ye.M., Yanovsky M.S.
463-465
A polarizing phase shifter for quasi-optical transmission line with phase sections made of crystal quartz and polarizers executed on the basis of small-period wire grids is considered. The phase shifter intended for operation in therahertz frequency region. It was examined at 0.89 THz frequency ( f0 ). The influence differential phase shift deviation in the sections on the phase shifter error is considered. The error was ±2° in the frequency region which is ±15% of f0.
DIFFERENCE BASES FOR HEXAGONAL GRIDS
Kopilovich L.E.
466-469
The notion of the difference basis for a hexagonal grid as a configuration of elements that provides the complete coverage of a definite hexagonal domain in the spatial-frequency plane is introduced. Configurations having the threefold symmetry and representing difference bases for hexagonal grids of given (arbitrary) radii are builded.