**2001, volume 6,
¹¹ 2-3**

** **

** **

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**GENERALIZATION
OF THE MODE-MATCHING TECHNIQUE FOR THE WAVEGUIDE T-JUNCTION WITH INNER METALLIC
INSERT**

*A. A. Kirilenko,
D. Yu. Kulik, V. I. Tkachenko, S. F. Kulishenko*

181-186

A mode-matching
technique modification is proposed for the calculation of *S*-matrices of *T*-junctions
with metal inserts within the branching region. The *H*-plane tee with
bifurcating plate in the straight is under consideration as the widespread
configuration in OMTs. The new algorithm revealed good numerical efficiency
excluding irregular points, which caused by eigen oscillations of the branching
region with metallized walls.

**REJECTION IRISES
AS EXTRACTED POLE E-PLANE FILTER SECTIONS**

*A. A. Kirilenko,
L. P. Mospan*

187-194

The paper
presents numerical results for design and optimization of an extracted pole *E*-plane
filter. Rejection poles are introduced by a rejection waveguide section. The
section is either a single rejection iris or a doubled rejection iris.
Significant improvement of BPF performances (namely, outband rejection level
and skirt selectivity) is achieved. Numerical data for 1-5% bandwidth *X*-
and *Ku*-range extracted pole E-plane filter are presented.

**THE EXACT
MODELING TRANSIENT PROCESSES FOR TWO-DIMENSIONAL OPEN RESONANCE STRUCTURES**

*A. I. Vyazmitinova,
A. O.Perov, Yu. K. Sirenko*

195-200

The paper deals with the problem of finding a correct way to restriction of the computational domain in the FDTD-method in its application to the analysis of transient wave processes in infinite two-dimensional domains containing compact inhomogeneous. The basis for the relevant approach is the formulation and incorporation into the computational scheme exact absorbing boundary conditions on the grid of Cortesian coordinates.

**QUASI-OPTICAL
DIELECTRIC RING- RESONATOR WITH CONDUCTING ENDPLATES**

*A. A. Barannik,
Yu. V. Prokopenko, T. A. Smirnova, Yu. F. Filipov,
N. T. Cherpak*

201-205

Characteristic equation for complex frequencies of two-layered (along radius) quasi-optical dielectric resonator with conducting endplates has been obtained. In a particular case of inner hole in dielectric cylinder, the experimental dependences of the resonator eigenfrequencies versus of the hole radius are given for eight-millimeter wave band. Frequency spectrum evolution of "whispering gallery" waves in spectrum of dielectric ring-waveguide is shown. Good coincidence of theoretical and experimental data is obtained for EH and HE oscillations in the teflon resonator.

**ALGORITHS OF THE
ANALYSIS AND SYNTHESIS OF REJECT CELLS BUILT ON PARTIALLY FILLED H-PLANE STUBS
IN RECTANGULAR WAVEGUIDES**

*L. B. Minakova,
L. A. Rud*

206-211

Algorithm for
the synthesis of reject units built on *H*-plane partially filled stubs in
rectangular waveguides is developed basing on exact solutions of the scattering
and spectral problems. The results of stub synthesis are presented for the case
of a dielectric with *ε*=9.5(1+*i*10^{-4})
that are used for the design of a three-pole band-stop filter.

**POTENCIAL
FUNCTIONS IN THE PROBLEM OF EXCITATION OF A WAVEGUIDE WITH THREE LAYERED
DIELECTRIC WITH A LONGITUDINAL MAGNETIC CURRENT**

*L. P. Yatsuk*

212-217

The rectangular waveguide filled with a three-layered dielectric inside and with a longitudinal slot in its broad wall is considered. The eigen waves method is modified in order to obtain the convergent solution for the magnetic field excited in this waveguide by the slot. For this purpose the potential functions have been obtained for a waveguide with a three-layered dielectric filling. They are used for expanding the magnetic current which is present in a clear form in the solution obtained with the eigen waves method. The convergent series were obtained for the partial inner admittance of the slot considered. The velocity of these series convergence practically does not depend on the width and permittivity of a dielectric slab inserted into the waveguide in parallel with its narrow sides.

**POSSIBILITY OF
THE SPECTRUM CLEANING OF EXCITED WHISPERING GALLERY MODES IN DIELECTRIC
CYLINDRICAL RESONATOR**

*V. V. Kutuzov,
A. E. Kogut, V. A. Solodovnik, S. N. Kharkovsky*

218-221

The experimental methods of the many-modes spectrum cleaning of excited whispering gallery modes in cylindrical dielectric resonator are investigated in this paper. The possibilities of the highest modes cleaning and selection of the single polarization modes are shown. The comparison results of the spectral characteristics of the whispering gallery modes which are excited in resonators based on dielectric cylinder by various ways are demonstrated.

**CHARACTERISTICS
OF WAVEGUIDE-DIELECTRIC RESONATOR WITH TWO-LAYERS DIELECTRIC ELEMENT AT SYMMETRICAL
H_{0np} OSCILLATIONS**

*R. I. Belous,
Yu. G. Makeev, A. P. Motornenko*

222-225

Expressions
which make it possible to calculate eigen frequencies *f*, partial *Q*_{1} - *Q*_{3}
and eigen *Q*_{0} *Q*-factors of the resonator based on
circular evanescent waveguide with two-layers coaxial dielectric element for
tha case of symmetrical *H*_{0np} oscillations modes have
been obtained. Computer calculations *f* and *Q* for the oscillation *H*_{011}
in sm and mm bands of wavelength have been made. An influence physical and
geometric parameters of the structure at the resonance frequency and eigen *Q*-factor
has been presented.

**A CLUTTER MODEL
CREATED BY THE BACK SCATTERED SEA SIGNAL IN THE FREQUENCY RANGE 1-100 GHz**

*G. P. Kulemin,
Ye. A. Goroshko*

226-234

The factors defining in a wide frequency band of 1-100 GHz the normalized RCS of a sea surface at small grazing angles in a wide range of speeds of wind, and also parameters of the scattered signal analyzed spectra. The main relations for simulation of the reflected signal are given.

**THE INFLUENCE OF
SOIL ELECTRIKAL PROPERTIES ON GPR SIGNAL CHARACTERISTICS**

*O. O. Ovchinkin,
V. G. Sugak*

235-241

On the basis of improved model of electrical constants of typical soils it was considered their influence on characteristics of GPR signal passed across layer of different depth. It is evaluated the influence of dispersive properties of electrical constants of soils on the depth resolution of GPR sensing signal. It is estimated the requirements to spectral width and its position on frequency axis of GPR sensing signal in relation to needed penetration depth at different soil humidity.

**THE SURFACE
OBJECT OVERHORIZON DETECTION PECULIARITIES IN UNF AND VNF RANGES WITH INVERSE
LAYERS**

*I. M. Mytsenko,
S. I. Khomenko*

242-246

It is show an effect of the sea surface reflections on radio wave attenuation factor distance dependence and, therefore, on a possibility of the surface object overhorizon detection detection on specific distances with inverse layers.

**ENERGY
CHARACTERISTICS AND DIRECTIONAL PROPERTIES OF ELECTRICALLY LONG SLOTS IN
RECTANGULAR WAVEGUIDE**

*S. L. Berdnik,
V. A. Katrich, V. A. Lyaschenko, N. A. Poluyanenko*

247-251

The long longitudinal slots cut in a wide wall of rectangular waveguide are investigated by method of magnitomotive forces. Physical regularities of forming of distribution of electric field on antenna aperture slot waveguide are cleared up. The thickness of waveguide walls was taken into account in numerical calculations. Computer analysis showed the possibility of optimization of energy characteristics of leaky-wave antennas on the base of long longitudinal slots.

**INFLUENCE OF
PLASMA FORMING GAS JET ON DISCHARGE STRUCTURE IN MICROWAVE PLASMATRON**

*À. Ya. Kirichenko,
A. P. Motornenko, O. A. Suvorova*

252-255

The dynamics of structural changes in microwave plasmatron discharge was studied in the paper. It is established that the discharge transition from filament into torch arose from changes of plasmaforming gas jet parameters. The behavior of maximum electrical field magnitude in discharge cross section is found.

**THE ENERGY
CHARACTERISTICS OF UHF PLAZMATRON WITH NONEQUILIBRIUM PLASMA**

*S. P. Martynyuk,
A. P. Motornenko, K. Schünemann and I. G. Skuratovskiy*

256-260

The energy characteristics of UHF coaxial plazmatron with nonequilibrium plasma excited CW microwave power of 10 GHz were investigated. Argon was used for creating of plasma expiring in free space. The coefficient of absorption of plasma is increase with increasing of generators power. The minimal powers for maintenance steady plasma flame have been obtained for two ways of gas supply in discharge region.

**THE
DETERMINATION OF THE ANTIFERROMAGNETIC RESONANCE FREQUENCY IN SEMIMAGNETIC
SEMICONDUCTORS BY MEANS OF SURFACE POLARITONS**

*N. N. Beletskii
and S. A. Borisenko*

261-267

In the articles surface polaritons are investigated in semimagnetic semiconductors which are in a phase of antiferromagnetic ordering. The influence of the external static magnetic field and the electron concentration on the dispersion properties of the surface polaritons is determined. It is shown that the surface polaritons can have the dispersion independent of the direction of their propagation in the Voigt geometry. A new method based on excitation of the surface polaritons in the semimagnetic semiconductors is proposed for determination of the antiferromagnetic resonance frequency.

**MICROWAVE
AMPLIFICATION IN A DISTRIBUTED SEMICONDUCTOR STRUCTURE ON SMITH-PURCELL EFFECT**

*V. A. Abdulkadyrov,
E. M. Khutoryan, A. I. Tsvyk*

268-273

Within small signal theory a microwave amplification in a distributed semiconductor structure on Smith-Purcell effect has been investigated. The plasma in a semiconductor was considered in quasi-hydrodynamical approximation. A characteristic equation has been obtained and it’s numerical solution has been conducted.

**INTERACTION OF A
NON-RELATIVISTIC ELECTRON BEAM WITH A SEMICONDUCTOR CYLINDER IN AN EXTERNAL
MAGNETIC FIELD**

*A. F. Rusanov,
V. M. Yakovenko*

274-279

The paper presents a theoretical study of electrostatic oscillations in a cylindrical system, which represents an electron beam surrounded by a finite-size semiconductor, that borders isolator or metal, in an external magnetic field. It is shown, that in this structure space charge waves and cyclotron waves could be unstable. It is also shown that, as the external magnetic field or the collision frequency of electrons increases the instability increment of these waves decreases.

**2001-3**

**AXIAL INDEX OF "WHISPERING
GALLERY" OSCILLATIONS IN DISK DIELECTRIC RESONATOR**

*A. A. Barannik,
Yu. V. Prokopenko*

286-288

The researches of quasi-optical dielectric disk resonators which differ by the longitudinal sizes have been obtained. The axial components of "whispering gallery" oscillations wave number have been obtained by a solution of the inverse spectral problem. The axial indexes of resonance oscillations in the studied resonators have been determined.

**NONLINEAR
SURFACE POLARITONS IN SEMIMAGNETIC SEMICONDUCTORS BEING IN A PHASE OF
ANTIFERROMAGNETIC ORDERING**

*N. N. Beletskii
and S. A. Borisenko*

289-293

In the articles nonlinear urface polaritons are investigated in semimagnetic semiconductors which are in a phase of antiferromagnetic ordering. It is shown that there exist two types of the nonlinear surface polaritons which characterized by nonotonic and non-nonotonic decaying of the electromagnetic field into semimagnetic semiconductor. It is found that nonlinear surface polaritons with monotonic decaying of electromagnetic field exist in the same frequency range as linear surface polaritons. It is found out that nonlinear surface polaritons with non-monotonic decaying of electromagnetic field propagate in the frequency range which is the non-passage range for linear surface polaritons. The influence of the electron plasma frequency on the dispersion properties of the nonlinear surface polaritons is determined.

**HCN LASER WITH
COMBINED PUMPING**

*Yu. E. Kamenev,
A. A. Filimonova*

294-297

An HCN laser with HF pumping plus DC or AC has been studied. The obtained results evidence good prospects for using the pumping in the form of HF plus low frequency alternating current.

**QUASISTATIC
FLUCTUATIONS IN OROTRON WITH HARD EXCITATION**

*G. A. Alexeev,
L. V. Stulova*

298-304

Based on the analytical theory using the successive approximation method the behaviour of the resonance microwave oscillators of the orotron-type is investigated in the steady-state mode and steadying one at the hard excitation oscillations and the slow variations of the accelerating voltage. The dependences of the stationary amplitude and steadying time of oscillations on the transient electron angle are calculated. The analysis of average characteristics is performed in the quasistatic approximation. The intensities of the amplitude and frequency fluctuations are calculated in the steady-state mode and near by thresholds of the autoexcitation and the failure of the oscillations and in the electronic hysteresis presence. The probabilities of the autoexcitation and the failure of the oscillations are performed.

**SECONDHARMONICGENERATION
FROM FLASHLAMP-PUMPED DYE LASERS**

*M. I. Dzyubenko,
I. G. Naumenko, V. V. Shevchenko*

305-308

Second harmonic generation (SHG) from flashlamp-pumped dye lasers (FLP DL) has been studied. There was shown that both bandwidth and divergence of the FLP DL on efficiency of the SHG is determined. The tunable radiation was received for two range of the UV spectrum.

**RESEARCH OF
FEATURES OF THE SECOND HARMONIC GENERATION BY PULSE-PERIODIC FLASHLAMP-PUMPED
DYE LASERS**

*M. I. Dzyubenko,
S. N. Kolpakov, V. P. Pelipenko, V. V. Shevchenko*

309-313

There were investigated the influence both of parameters of laser radiation and the focusing conditions on efficiency of second harmonic generation by flashlamp-pumped dye lasers experimentally. There were optimized conditions that are necessary for tuning of the radiation wavelength by a continuously variable amount in a spectral range limited to a spectral band of dye. There was designed the pulse-periodic dye laser that oscillates in UV-range of spectrum 280-300 nm.

**ON THE THEORY OF
HARD EXCITATION IN O-TYPE RESONANCE OSCILLATOR WITH LONG-TIME INTERACTION**

*Yu. V. Kornienko,
D. S. Masalov*

314-319

Analytical theory of hard excitation in a long-time-interaction O-type resonance oscillator is developed in assumption of small amplitude of radio frequency electric field. An expression for the steady-state amplitude is obtained. Existence of the applicability domain of this theory is proved. Four initial intervals of hard excitation are found. Consideration was carried out using traditional methods but required the approximate solution of the electron motion equation in sixth approach which so far was not obtained because of need to deal with rather sophisticated expressions.

**THE
INTERRELATIONSHIP OF ONE- AND TWO-PARAMETRIC MODELS OF LIMITED ENERGY RANDOM
SIGNALS**

*A. A. Mogyla,
K. A. Lukin*

320-326

The interrelationship between orthogonal one- and two-parametric models of limited energy random signals is obtained. The interrelationship is obtained between one- and two-parametric models of their samples and the interrelationship between correlation function of component these models on this framework too. To obtain these interrelationships, the mathematical apparatus of Hilbert spaces of random processes over Hilbert space of samples and methods of random processes energetically theory is used. An energy characteristic of one- and two-parametric models random signals in arbitrary orthonormal basises is analyzed and the interrelationship between these characteristics is obtained.

**performance evaluation OF NOISE RADAR BY METHODS**

**OF ambiguity function**

*K. A. Lukin,
A. A. Mogyla, Yu. À. Àlexandrov, T. K. Lukina*

327-337

The analytical relation for ambiguity function of sampling narrow-band stationary ergodic noise signal has been obtained. The algorithm of experimental estimation of ambiguity function of this signal, using imitator of uniform in-line motion of point target has been substantiated. The optimal performance of measurements has been defined. The vibrating corner reflector was used as an imitator. The measuring bench was created. By means of it the estimation of the range resolution and the accuracy of range and radial velocity measurements using the considered type of signals as probing ones has been carried out. These estimates were conducted by means of ambiguity function. They were shown to have the same values both for partite and joint estimation.

**APPLICATION OF
INPUT ADMITTANCES METHOD FOR DEVELOPING NEW INFORMATION TECHNOLOGY OF
RECORDING-READING BINARY DATA**

*V. V. Demyokhin*

338-340

Peculiarities of coherent optical signals reflection from layered medium with operated optical thickness are considered by means of input admittances method. It is shown that using these peculiarities in memory systems, keeping several bits in every signalogram elements, allows one to reduce as number of power levels of recording laser, and wavelengths number of multi-value information reading.

**USE OF THE
EHF-DIELECTROMETRY METHOD FOR THE STUDY OF GROWTH PHASES OF E.COLI CELLS**

*N. V. Dreval,
T. Ju. Schegoleva, V. G. Kolesnicov, A. P. Belosorov,
E. I. Miljutina*

341-344

The EHF-dielectrometry method has been applied in the millimeter wavelength range, for the study of a culture of E.coli cells of different ages. It is shown that there is an essential modification of permittivity parameters of cell structures of the growing bacteria on application of antibiotics.

**EHF ****Ñ****OMPLEX
DIELECTRIC PERMITTIVITY AND STRUCTURE OF LIVER DNA FROM RAT'S IRRADIATED IN
CHERNOBYL ZONE**

*V. A. Kashpur,
O. V. Khorunzhaya, A. A. Krasnitskaya, V. Ya. Maleyev,
M. A. Semenov*

345-349

It was studied the hydration environment and changes of structure of DNA from liver of rats irradiated in Chernobyl NPS zone. For aqueous solutions, changes of complex dielectric permittivity in mm range have been discovered. It was found a decrease of hydration value pointing on a weakening of ordering influence on water environment for irradiated DNA in comparison with the influence of native one. The effect is explained by violations of DNA conformation due to irradiation. IR spectra derived indicate on essential distortions of secondary structure of the macromolecule while electrophoresis points on considerable disintegration of DNA.