2010, volume 15, № 1
SLOT RADIATOR IN A COAXIAL CABLE
V. A. Katrich, V. A. Lyaschenko, N. V. Medvedev
7-16
By means of magnetomotive forces the problem of characteristics transverse slot in the external conductor of coaxial cable in the wide band of wavelength, including multimode conditions was solved. The amplitudes of space harmonics in the function of distribution tangential component the electric field in the slot were investigate. The dependences of radiation and reflection factor from the dimension of the slot, geometrics of coaxial cable and permittivity of the dielectrics inside and outside the line was studied.
THE MODE MATCHING TECHNIQUE TAKING INTO ACCOUNT FIELD SINGULARITIES APPLIED TO THE INNER PROBLEMS WITH ARBITRARY PIECEWISE-COORDINATE BOUNDARIES
PART 1. EIGENMODE SPECTRUM OF ORTHOGONIC WAVEGUIDES
S. A. Prikolotin, A. A. Kirilenko
17-29
We describe a generalized method of finding the eigenmode spectrum of hollow waveguides with complicated cross-section and arbitrary piecewise coordinate boundaries. This method is based on taking into account the field singularities near the edges of boundary. Ridged, T-septum, cross-shaped, coaxial, split-ring-shaped waveguides, waveguides with multiple grooves etc. are considered. Such waveguides are the structural units of many microwave devices. All stages of implementing the algorithm of the mode matching technique accounting for field singularities are given. That ensures consideration of complicated waveguide and perforated screens vector scattering problems. Distributions of the transverse electric fields for the lower and higher modes of some exotic cross-section waveguides are shown. This demonstrates the effectiveness of final computer code.
SCATTERING PROPERTIES OF RESONANT SLOT-FRAMED PATCHES FOR CYLINDRICAL MICROSTRIP ANTENNA
А. Ye. Svezhentsev, V. V. Kryzhanovskiy
30-34
A radar cross-section of cylindrical microstrip antenna with new slotted strip-framed patches has been calculated. A resonant behavior versus frequency for slotted strip framed patches has been studied. The amplitude and the phase current density distributions on the patch surface have been calculated. It has been found that the resonant frequencies of slotted strip-framed patches can be at substantially lower frequencies as compared to the rectangular cylindrical patch case. The potential of the discussed patches has been shown for the application to small-size cylindrical microstrip antennas including the short-wave employment.
APPLICATION OF THE SIGNALS SCATTERED FROM THE SEA SURFACE FOR DIAGNOSING OF CM-WAVE PROPAGATION
I. M. Mytsenko, S. I. Khomenko
35-42
The summary of the works on problem in research is presented. The experimental mean and specific effective scattering surfaces for extreme range distances of detecting reflections from the sea surface at different cm-wave propagation conditions are determined. The main attention was given to the over horizon area. Dependence between “illuminated” area and range of detection of above water objects was defined for the over horizon radar. The conclusion that reflections from the sea surface may be used for on-line diagnostics of cm-wave propagation conditions in the over horizon area was drawn.
THE INFLUENCE OF HORIZON LINE ON MEASUREMENTS OF TROPOSPHERE REFRACTION USING GPS SATELLITES RADIOSETTINGS OVER THE DRY LAND
V. B. Sinitsky
43-50
The results of field measurements of GPS satellites radiosetting angles above the dry land surface are presented. The possibility for separating the effects related to the uneven horizon line from the variable component due to seasonal changeability of troposphere refraction is shown. The property of synchronousness of GPS satellites orbits is used in statistical processing which is conducive to grouping the data being measured in the fixed azimuthal directions.
DOUBLE FREQUENCY SOUNDING OF THE POLYDISPERSE SOLID AEROSOLS
R. Knoechel, А. М. Linkova, А. L. Tepljuk, G. I. Khlopov, К. Schuenemann
51-61
Double frequency method for the remote sensing of the polydisperse solid aerosols is considered for measurement of particle dimensions. Results of the numerical simulation based on the rigorous solution of the diffraction problem are given, which allow to estimate limits of the method applicability and influence of the medium polydispersity. Results of the development of measuring bench and model data of the solid aerosols by the instrumentality of calibrated particles of beach sand are also given.
Noise radar with synthesizing a spectrum of sounding signal
K. A. Lukin, A. A. Mogyla, V. P. Palamarchuk, A. V. Kravchuk, B. S. Cherniy
62-71
The results of development and experimental research of L band noise radar with the synthesized spectrum of sounding signal are presented. Behavior of a synthesized noise signal phase has been studied in case of stepped frequency increase. Besides, we have investigated the basic radar performance such as, spectral characteristics of probing signal, its central frequency switching time, output signal of quadrature detector, range profile, etc. Possibility of range limitation is experimentally shown in the required observation area jointly with selection and measuring of the target distance within this area when using sounding noise signals with the synthesized spectrum.
PASSIVE СОHERENT RADIOLOCATION AT HF BAND
PART 1. DETECTION OF AIR TARGETS
A. V. Vichkan’, P. A. Melyanovsky, A. I. Shut’
72-77
The physical principles, energetics and structure of passive coherent radar at HF band are presented. Theoretical estimation of expected maximum detection ranges of air targets is given.
MODEL OF GLOBAL ELECTROMAGNETIC RESONANCE DISTURBANCE BY EXTRA-GALACTIC GAMMA-BURST ON DEC. 27, 2004
A. P. Nickolaenko, M. Hayakava
78-85
We model and discuss possible impact on the Schumann resonance records of a giant extra-galactic gamma-burst that occurred in Sagittarius constellation (SGR 1806-20). The lower ionosphere modification is shown to be capable of causing an abrupt change in the power spectra of global electromagnetic resonance. Spectral modification gradually diminishes, so that the habitual picture restores in some time after the burst, and the disturbances disappear. A technique is proposed for measurements, which underlines the gamma-burst effect.
ANGULAR SELECTIVE PROPERTIES OF ONE-DIMENSIONAL ANISOTROPIC PHOTONIC CRYSTALS
K. A. Vytovtov, A. D. Arhipov
86-90
In the work an anisotropic photonic crystal with an arbitrary direction of an anisotropy axis is considered. The dependence of the reflection coefficients on an incidence angle of a plane harmonic wave on a plane-parallel slab is studied. The resonant characteristics in the incidence angle plane are obtained. It is offered to use them as formers of optical radiators patterns.
INFLUENCE PARAMETER DIODE WITH CATHODE STATIC DOMEN UPON OSSILATION THRESHOLD OF UHF NOISE
E. D. Prokhorov, O. V. Botsula, S. B. Sокоlоv
91-95
It is considered diode, in which under determined condition is formed static cathode domain, in which under greater voltages can develop impact ionization. The impact ionization lead to avalanche transit effect and arising UHF range noise. Influence parameters cathode region (mobility electron and holes, drift saturation velocity of the electron and holes, chromium doping level of cathode region) upon voltage-current characteristics of the diode with cathode static domain are shown below.
DIFFRACTION RESONANCE EMISSION OF ELECTROMAGNETIC WAVES BY ELECTRON BEAM CLOSE TO REFLECTION GRATING WITH METAMATERIAL
O. P. Kusaykin, P. M. Melezchyk, A. Yu. Poyedynchuk
96-102
By the decomposition method diffraction problem of the plane inhomogeneous H-polarized wave, generated by the modulated electronic beam, on a periodic reflecting grating, is solved. The grooves of this grating are filled with metamaterial with negative dielectric permeability and frequency dispersion. The resonance radiation effect of electromagnetic waves by such structure is found and the conditions of its occurrences are definite.
THE NONLINEAR THEORY OF THE ELECTROMAGNETIC WAWES GENERATION BY ELECTRONS IN THE FIELD OF CHARGED FILAMENT
Yu. V. Kirichenko, I. N. Onishcenko
103-110
The nonlinear theory of electromagnetic field generation in orbitron is developed. The set of the equations including the equations of field excitation and equations of 2-dimential motion is constructed and numerically solved. It is shown, that mechanism of energy exchange of electrons with the wave in orbitron and in magnetron has much in common. For the fixed parameters of orbitron from the point of view of generated energy and electronic efficiency there is some optimal value of electron density in the interaction region.
Multibeam two-stage O-type frequency multiplier
E. N. Odarenko
111-118
Theoretical investigation of the frequency multiplication in the hybrid O-type electric vacuum device with multi-beam electro-optical system is performed. Multidimensional nonlinear theory of the two-stage electron devices with prolonged interaction is used for analysis of the physical phenomena. Physical reasons of the interaction efficiency enhancement due to forming of the partial streams initial velocities distribution in the multilayer electron beam are determined.
HIGHER HARMONICS GENERATION IN DIFRACTION RADIATION OSCILLATORS
V. G. Kurin
119-122
It is shown that the investigated oscillator operating in a 2-nd harmonic oscillating mode is physically equivalent to oscillator operating on the 2-nd time harmonic with the subsequent signal amplification in an interaction space of the same device. The advantage of oscillators operating in the oscillating mode, in particular, a 2-nd harmonic in comparison with its operating on “purely” time harmonic (frequency multiplication mode) or “purely” space ones, is concluded in amplification effect.