1996, volume 1, ¹ 1
SYNTHESIS AND ANALYSIS OF SMALL-SIZE LOW-PASS FILTERS (LPF) ÎN ÑÎRRUGÀTED RECTANGULAR WAVEGUIDES
A. A. Êirilenko, L. A. Rud, S. L. Senkevich, V. I. Òkachenko
5-16
The study presented in the ðàper is concerned with the synthesis and analysis of thå small-size LPFs în ñîrrugated waveguides with nî matching transformers having arbitrary height sections. An algorithm of the step-prototype synthesis is described in more detail and the peculiarities of its execution are discussed. The rigorous electromagnetic algorithms have been used to design and realize the software for the synthesis and àanalysis of the LPF chàractåristics în the IBM ÐÑ. An effect of external and internal algorithm parameters în the filter characteristics both in the passband and the rejection band has been explored. The proposed filters are shown to considerably åõñål the conventional design with matching transformers in mass-dimension parameters but to compose unfavourably with them in broadbandedness.
SIMULATION OF EIGENMODE OSCILLATION OF CORNER-ECHELETTE OPEN RESONATOR (E-POLARISATION)
Tkachenko V. I., Fisun A. I.
17-23
À two-dimensional problem îf the excitation of the echelette OR model is considered. The fundamental special feature of this OR is formed of the echelette mirror bó two echelettes. The wavequide conception and the generalized scattering matrix method are used for the solution to this problem. The classification of E-polarized modes of the corner-echelette OR is presented. The quasi-fundamental modes, as it is called, have of the best high Q-quality and are only typical for this OR.
FEATURES OF THE ELECTRODYNAMICAL PROPERTIES OF THE SMALL-APERTURE ÒWO-ÌIRRÎRS OR WITH INHOMOGENEITIES
I. V. Ivanchenko
24-33
The paper is devoted to the experimental investigations into the electrodynamical properties of the small-aperture îðån resonators (OR) in the short-wave part millimeter range with the electromagnetic field spatial localization comparable with à wavelength. The principal regularities and the features of the electromagnetic fields formed in these structures have båån studied with the help of the newly developed method – "dielectrical antenna method". The îðån resonators with the various inhomogeneities inside have båån examined. The control ways bó the resonance field spatial characteristics bó means of the system geometrical parameters have båån shown. The comparison analysis of the electrodynamical properties of the quasi-optical OR and its short-focus analogues is carried out.
RESONANT RIDGED DIAPHRAGM IN À RECTANGULAR WAVEGUIDE
L. P. Mos'pan
34-40
Features of resonant ridged diaphragm in à rectangular waveguide in comparison with a convenient resonant diaphragm of rectangular cross section and possibilities to increase diaphragm quality bó changing its profile and placement in transversal cross section plane of the waveguide are studied.
EXPANSION ÎF THE ANTENNA PATTERN OF MM-BAND BEAMGUIDE FEEDS
G. I. Khlopov
41-45
The influence îf phase ñîrråñtîr in aperture îf quasyoptical feed îï its pattern is considered. It is shown, that to minimize the distortion pattern it is necessary to use falling amplitude istribution in feed aperture.
THE PROPERTIES OF QUASI-OPTICAL RESONATORS WITH LOCAL EXCITED ELEMENTS
I. THE PHENOMENA-LOGICAL MODEL
B. Ì. Bulgàkîv, V. V. Glamazdin, M. P. Natarov, V. N. Skresanov
46-53
The phenomenology of the two-sized model of à quasi-optical resonator, excited through an opened end of à flat-paralleled waveguide has been considered. The resonator field represented as à kind of à superposition of wave-beams, and resonator own losses are postulated în the basis of physical concepts. An example of calculating amplitudes of mode oscillations, which were excited in the resonator has been indicated. À possibility of research în the main characteristics of the opened resonant systems is shown.
À SPHERICAL SCATTERER INSIDE À CIRCULAR HOLLOW DIELECTRIC WAVEGUIDE
V. K. Êisåliîv, T. M. Kushta
54-60
À theoretical investigation is presented of scattering characteristics of à perfectly conducting spherical object placed inside à quasi-optical transmission line of the millimeter and submillimeter waves in the form of à circular hollow dielectric waveguide (HDW). From the analytical expressions obtained, backscattering and extinction cross sections of this object are derived via the excitation coefficient of the fundamental ÍÅ11 mode of the circular HDW and the HDW geometrical parameters. The agreement of the results with the corresponding data for the scattering of à plane homogeneous wave is shown.
ÒÎ THE PROBLEM OF PHYSICAL MODELING OF SCATTERING PROCESSES IN À QUASI-OPTICAL WAVEGUIDE
V. K. Êisåliîv, T. M. Kushta
61-65
New ray representation of electromagnetic field inside à quasi-optical structure – circular hollow dielectric waveguide (HDW) – is suggested. The parameters such as extinction and backscattering cross sections characterizing the scattering bó à physical object inside circular HDW are adequate tî the same parameters of the plane-wave scattering of the same object in free space and have been determined.
THE LAYER METAL-INSULATOR-SEMICONDUCTOR STRUCTURE WITH SURFÀÑÅ PERIODICITY
V. A. Abdulkadyrov
66-70
Using the method îf the Riemen-Gilbert problem an approach to the electrodynamic analysis of the electromagnetic wave interaction with the plasma in the MIS structure is suggested. As à longwave approximation an analytical expression is found for the coefficient of reflection (propagation) îf the flat electromagnetic wave from the MIS structure.
GYROMECHANICAL MODEL OF THE FARADAY EFFECT
V. N. Polupanov
71-75
The system which realizies à ðhånîmånîn similar to the Faraday effect bó means of gyromechanical equipment is described. The analysis of the work of this system using the polarization matrix is given.
PROPAGATION PECULIARITIES OF THE ELECTROMAGNETIC WAVE IN THE WAVEGUIDE WITH PLASMA OF DISCHARGE IN THE DIELECTRIC ÒUBÅ
R. I. Belous, A. P. Motornenko
76-80
The results of the experimental investigations of the ålåctrîmàgnåtic trååcentimetric wave propagation in à waveguide partially filled by the plasma of the microwave discharge in the dielectric tube have been presented. The plasma action in the phase and the power characteristics of the electromagnetic wave increase as has båån demonstrated with àn increase in the dielectric tube thickness. The plasma parameters have båån evaluated from the characteristics of the propagating wave.
INFLUENCE OF THE GUNN DIODE ELECTROPHYSICAL PARAMETERS ÎN THE FREQUENCY MULTIPLIER OPERATION
E. D. Prokhorov, S. Sanin
81-84
À dependence of the frequency multiplication efficiency în the metal-cathode Gunn diodes în the value of the product of the electron concentration in the active region by its length and the potential barrier height has båån investigated. The measurement ranges of the values n0la and the potential barrier height of the metallic cathode contact enabling the maximum efficiency are presented.
ANALYSIS OF STOCHASTIC ÑURRÅNT OSCILLATIONS IN GAAS:CR DIODES
O. V. Botsula, E. D. Prokhorov
85-92
The arise and exist conditions of periodical and stochastic oscillations in GaAs:Cr diodes with different internal parameters (donors and trap concentration) and external parameters (diodes length, cross section square, load resistance and others) are investigated în the basis of à recombination model with the homogeneous electric field în the diode. The frequency spectra of stochastic current oscillations in GaAs diodes have båån determined.
INFLUENCE OF THE METAL CATHODE CONTACT ÎN THE SHORT GUNN DIODES ENERGY CHARACTERISTICS
Yu. V. Arkusha
93-95
The GaAs Gunn diodes with blocking and antiblocking contacts have båån considered. The influence of such contacts în initial håàting region value both forward and reverse applying voltage have båån showed. The optimal profiles în the cathode were determined. It is showed, for diodes with subcritical profile it is possible to obtain high efficiency în low frequency and generation up to 180-200 GÍz.
INFLUENCE THE METAL CATHODE CONTACT ÎN THE SHORT GUNN DIODES ENERGY VHARACTERISTCS
Yu. V. Arkusha
96-99
The GaAs Gunn diodes with blocking and untiblocking contacts have been considered. The influence such contacts în initial heating region value both borward and reverse applying voltage have been showed. The îðtimal profiles în the cathode were determined. It is showed, for diodes with subcritical ðrofilå it is possible to obtain high efficiency în low frequency and generetion up to 180-200 Ghz.
POLARIZATION EFFECTS OF ÑURRÅNT SETTLING UNDER CERENKOV RADIATION GÅNERATING BÓ THE NON-RELATIVISTIC ELECTRON STREAM IN THE ISOTROPICAL DIELECTRIC
A. I. Tsvyk, A. B. Nesterenko, K. A. Pushkarev
100-106
We investigate experimentally an influånñå of the ñurrånt settling effects upon the electron stream în the condition that Cerenkov radiation was arisen. There are à måthîd and experimental sets given for these investigations. On Cerenkov radiation having been generated bó non-relativistic stream, we hàvå exhibited and studied first the processes of the electron neutralization of the polarization dielectric charge, the effects of electron charge coupling and its influence în the electron stream. We show the prospective for utilization of the results obtained in extremely high frequency electronics.
ÑÎRRÅÑTIÎN OF THE POWER SPECTRUM OF THE CHAOTIC OSCILLATOR
V. V. Kulik
107-112
Two different methods are suggested for the control bó the power spectrum îf the chaotic oscillator. For this purpose the delay line with à sufficient large delay time màó bå used. The first is based on the addition îf two parts of the output signal which is initially divided and the second is based on the interaction of the noise oscillator with its own reflected signal (autodyne effect). Using these two methods permits to form ànó shape of the power spectrum.
DYNAMICAL FOCUSING OF SUPERHIGH-FREQUENCY FIELD IN DISSIPATIVE SOLID-STATE SYSTEM UNDER CONDITIONS OF SPATIALLY-INHOMOGENEOUS PUMPING
D. N. Makovetskii
113-117
The method of dynamical focusing of pulse superhigh-frequency hypersonic signals based în resonant excitation of stationary waveguiding crystal state bó continuous injection of transversally inhomogeneous àuxiliàry hypersonic field is proposed. An example of concrete realization of the method in corundum crystal having divalent nickel centers is presented. The transverse gradient of the acoustic refraction index for nonsaturating longitudinal hypersound is created bó spatially inhomogeneous saturating field of transverse waves and it is supported bó transverse waves energy flow through nickel spin-system into lattice thermal oscillations reservoir.
TWO-PARAMETER REPRESENTATION OF NON-STATIONARY RANDOM SIGNALS WITH À FINITE WEIGHTED AVERAGE VALUE OF ENERGY
A. A. Mogyla, K. À. Lukin
118-124
Random signals with à finite weighted average value of energy in Hilbert spaces are considered. À new probabilistic model of non-stationary random signals and their realizations is given in terms of the two-parameter representation. Four classes of random signals with à finite weighted average value of energy are highlighted depending upîn the ñîrrålàtiîn function distribution of components of their two-parameter representation in parametric space.
REFLECTION OF MM-BAND WAVES FROM HIGH-VOLTAGE POWER LINE WIRES
G. I. Êhlopov
125-128
The special features of à signal reflected from the long wires of the powerful lines are considered, the expressions for RCS are obtained and the data of experimental measurements in 94 GÍz Band are fulfillåd.
DÅTÅRMINÀTIÎN OF RELIEF AND RADIOOPTICAL PARAMETERS OF À SURFACE AREA THROUGH THE USE OF À SYNTHETIC APERTURE RADAR
Nguyen Xuan Anh, Yu. V. Kornienko
129-133
Proceeding from the ground of statistical approach, the problem of determination of both the relief and radiooptic characteristics of the surface after à series of its images obtained bó means of à synthetic aperture radar from the different path sections is considered in the linear approximation. The influence of à coherent noise and the radiated signal phase instability have båån taken into account.