1999, volume 4, ¹ 3
PHONON ABSORPTION OF MICROWAVE ELECTROMAGNETIC FIELD IN THE SUPER-HIGH QUALITY DIELECTRIC CRYSTALS
E. M. Ganapolskii
7-15
A new method for
measuring extremely low dielectric losses of microwave electromagnetic field in
dielectric crystals in millimeter wave band was proposed and implemented. These
losses are associated with the phonon absorption (PA) of the electromagnetic
field caused by the nonlinear (anharmonic) properties of a crystal phonon
system. The method is based on the use of a sphere dielectric resonator (SDR)
made from the crystal being measured. The electromagnetic “whispering gallery”
oscillations with the super-high quality factor are excited in this resonator
in the case where the quasi-optical parameter 
where k
is the wave vector of the electromagnetic wave in open space, a is the sphere
radius, 
and 
are the
dielectric and magnetic permeabilities of a sphere material. A theoretical
background of the SDR method has been provided. A SDR-based technique of
measuring extremely low dielectric losses in solids over the 8-mm wave band at
different temperatures including the low temperatures is described. The results
obtained by measuring dielectric losses temperature dependence in sapphire,
ruby, quartz and fluorite crystals at a frequency of 36.7 GHz within the
temperature interval varying from room-air temperature to that of liquid helium
are presented. Possible mechanisms responsible for the microwave
electromagnetic field residual absorption in the dielectric crystals are
discussed.
GENERATION OF THE SECOND HARMONIC BY REFLACTING FROM A NON-LINEAR PERIODICAL MEDIUM
A. A. Bulgakov, S. A. Bulgakov
16-30
In the present paper, a theory of nonlinear interaction of electromagnetic waves in a half-limited periodical dielectric structure is developed on the example of the second harmonic excitation. It is assumed that our of the period-forming layers has a non-linear polarization. The suggested analysis method is based on the disturbance theory, and namely on the Green's formula (16). It was shown that the synchronism conditions for interacting waves have the form of the Bregg resonances, individual layers, or on a structure period. Besides, as it follows from the consideration below, the interaction is most efficient at the pass band interfaces by a full-period resonance.
CURRENT SELF-OSCILLATION MODELLING IN BACKDISPASE SEMICONDUCTING PNIPN STRUCTURES
K. A. Lukin, P. P. Maksymov, A. A. Colavita, H. A. Cerdeira
31-36
The difference equations of the diffusion-drift model of backdispase semiconducting pnipn structures have been solved. The results of calculation of electrical field of pnipn structure and currents, flowing through this structure have been presented. It has been shown, that the backdispace pnipn structure has a positive back-coupling on drift current, which stipulated nonlinear regime of current self-sustained oscillations. This regime make perspective the backdispace pnipn structures in the sense of creating on their base different semiconducting devices, e. g., chaotic oscillations generators, avalanche photomultiplexers, high-frequency thyristors, etc.
UHF ELECTROMAGNETIC PHENOMENA IN SEMICONDUCTOR STRUCTURE WITH PECULARITTIES INTERACTIONS
V. A. Abdulkadyrov
37-41
Electrodynamical analysis of an active semiconductor structure has been made. A characteristic equation of the structure has been derived. Complex constants of space-charge waves have been determined. The starting characteristics of the resonance system have been found.
CALCULATION OF THE DOMAIN OF DOUBLE OSCILLATION MODES
A. A. Gurko
42-44
The analytical expressions have been suggested, which describe the relation between the magnetic field upper boundary of the oscillation mode domain under consideration and the parameters of the interaction domain and the magnetron oscillation system. The theory is illustrated by experimental results.
OPTIMIZATION OF PARAMETERS OF THE MAGNETRON TRANSFORMING UNIT
A. A. Gurko
45-49
In the present paper, the methods of experimental measuring of the geometric length of the waveguide resistance transformer are described/ The designing of the transforming unit of energy output, which reduces the selectivity of the latter, is illustrated by examples.
GREEN’S FUNCTION OF CYLINDRICAL VOLUMES WITH LONGITUDINALLY-INHOMOGENEOUS FILLING
Yu. M. Penkin
50-59
The Green’s functions of electric and magnetic types for the Hertz vector potentials have been derived for cylindrical volumes (included rectangular) with longitudinally-inhomogeneous dielectric filling. Infinite, semi-infinite structures and resonators (with plane ideally conducting butt-end boundaries) are considered in the case of their exitation by longitudinal currents. Green’s functious are derived for both two-layerd and three-layerd longitudinally-inhomogeneous filling.
SPECIFIC BEHAVIOR OF EIGEN FREQUENCIES OF DIFFRACTION-BOUND OPEN RESONATORS BY SOME TYPES OF BOUNDARY TRANSITIONS
P. N. Melezhik
60-65
In this paper, a method of investigating the spectral characteristics of diffraction-bound open resonators in the form of circular cylinders with longitudinal slots has been suggested. An algorithm of calculating eigen frequencies of such type of electrodynamical structures has been developed. The behavior of eigen frequencies by boundary transitions from the system of connected resonators to an isolated resonator has been analyzed.
NUMERICAL ANALYSIS OF LOSSY CIRCULAR MICROSTRIP ANTENNA
N. Yu. Bliznyuk, A. I. Nosich
66-70
In this paper the method of analytical regularization combined with the Galerkin method has been proposed to determine the fundamental antenna effects of a circular lossy patch antenna on dielectric substrate backed by a perfectly conducting ground plane and excited by a vertical electrical dipole. Due to analytical regularization the dual integral equation in transform domain proved possible to convert into the infinite matrix equation of Fredholm second kind. This matrix equation has been solved by means of the efficient numerical procedure. Antenna characteristics, such as surface and space wave power, radiation patterns and radiation efficiency have been obtained for different values of patch resistivity and results are discussed.
NATURAL OSCILLATIONS OF WAVEGUIDE-DIELECTRIC RESONATORS BASED ON SECTIONS OF PARTIALLY FILLED RECTANGULAR WAVEGUIDES
L. Minakova, L. Rud
71-77
The qualitative
characteristics of eigen-frequency spectrum of 
natural
oscillations in waveguide-dielectric resonators, formed by sections of
partially filled rectangular waveguide, have been investigated on the basis of
rigorous setting and solution of the spectral boundary-value problem. The
conditions were round and characteristic features of the regimes of full
adsorption and transformation of modes for the case of a lossy dielectric. The
theoretical conclusions were confirmed by the results of numerical analysis of
spectral dependencies and fields of natural oscillation in resonators with
below-cutoff and upper-cutoff output ports.
E-TEE DIPLEXER WITH THE CHANNEL FILTERS ON IRISES
A. A. Kirilenko, D. Yu. Kulik, L. A. Rud', V. I. Tkachenko
78-84
Design of waveguide diplexers on E-plane tees with tuning iris in the side arm and iris channel filters in the straight arms is considered. The S-matrix technique and mode-matching algorithms are used for creating full-wave models. The synthesis of filters is based on Levy-Rhodes circuit theory scheme. The design of diplexer as a whole is derived with the help of the so-called Y-scheme, which leans upon the search of common junction with equal reflection coefficients in all ports. The special emphasis is placed on the problems of efficient numerical modeling that provides optimization of frequency response on PC.
QUASI-OPTICAL COMBINERS BASED ON ONE-DIMENSIONAL DIFFRACTION GRATINGS
A. A. Kostenko, G. I. Khlopov
85-89
The properties
of quasi-optical two- and four-port combiners based on one-dimensional
diffraction gratings are considered in the millimeter wave range. In
particular, the quasi-optical combiner of signal powers in the frequency bands
of standard-size waveguides - 2.4
1.2 mm2,
3.61.8 mm2,
5.22.6 mm2
, and 7.23.4
mm2 is realized and investigated.
ABOUT RADIAL DISTRIBUTION OF THE MODES ENERGY AT THE SHIELDED LAYERED HEMISPHERICAL RESONATOR
Yu. F. Filipov, A. E. Kogut, V. V. Kutuzov, S. N. Kharkovsky, Z. E. Eremenko
90-95
The results of theoretical and experimental investigations of the spectral characteristics and radial energy distribution of the resonant modes field at the shielded layered hemispherical resonator are shown in this paper. The whispering-gallery-modes are excited in this resonator under the certain parameters of dielectric hemisphere and metal shield. Their Q-factor exceeds by an order that of the modes of open dielectric hemisphere.
INVESTIGATION OF THE HARMONIC WAVE UNPROPAGATION REGION BOUNDARIES FOR PERIODIC LAYERED BIANISOTROPIC MEDIA
K. A. Vytovtov
96-99
The non-propagation regions of harmonics by periodic layered media with uniaxial bianisotropy have been investigated. The applied analytical approach was based on the method of the conversion matrix for a period. The expressions determining the non-propagation region boundaries have been derived and analyzed.
RANGE RESOLUTION OF THE VIDEO IMPULSE RADAR IN THE MEDIUM WITH ABSORBTION AND DISPERSION
Yu. V. Kornienko
100-104
The theory of optimal signal reception in the medium with absorbtion and dispersion for the case of superwide band location of a double point object has been developed, and the dependence of the range resolution of the locator on the signal and noise spectra has been found. It is shown that, with infinitely small difference of the distances from the object’s components, one can distinguish the double object from the single one having the same reflecting properties with a high reliability if the signal-to-noise ratio is sufficiently large. This result is based essentially on the point nature of the object.
NOISE RADAR TECHNOLOGY FOR SHORT RANGE APPLICATIONS
K. A. Lukin
105-111
Noise Radar Technology (NRT) is a radar technology that uses the noise continuous (or quasi continuous) waveform (NCW) as a probe signal and correlation processing (or double spectral one) of radar returns for their optimal reception (matched filtration). The NRT has been shown to be both promising for short range applications and adequate to today's microwave and electronic technologies. Noise Radar of two different types proved developed. One of them uses the correlation processing of the radar returns, while the second one exploits their, so-called, double spectral processing. It has been shown experimentally that the NRT could be successfully used in the radar development for various civil applications, such as automatic cruise control, ground based SAR imaging, automatic aircraft landing and ship/boat docking, etc.
THERMAL RADIATION OF A ROUGH SURFACE IN THE SMALL-SLOPE APPROXIMATION
D. V. Mikhaylova, I. M. Fuks
112-117
In the small-slope approximation of the Kirchoff technique, influence of the rescattered thermal radiation of the atmosphere on the total rough surface brightness temperature is investigated. Numerical studies of the rough surface thermal radiation brightness temperature with various values both of the surface dielectric constant and of the atmosphere optical thickness were carried out. The results show that, with an external radiation, the surface irregularities lead to increase of the rescattered component of the atmosphere thermal radiation intensity.
FAST ALGORITHM OF FOCUSING THE RADIO LOCATION IMAGES OBTAINED BY BISTATIC VIDEO-PULSE SOUNDING
V. O. Kovalenko
118-124
A fast algorithm of the radio location image focusing is presented. It is assumed in the algorithm that the bistatic scheme of the ultra wide band probe pulses transmitting and receiving is used. Comparing with the generic scheme of the image focusing, the method does not bring any additional losses into the data being processed. On the other hand, it provides a three to eight times faster performance. The methods efficiency and correctness has been tested theoretically and illustrated by the computational experiment results. The algorithm proposed can be used in both subsurface radar imagery and remote sensing applications.
ON THEW ISSUE OF REDUCING THE EFFECT OF IONIC BOMBARDMENT OF THE CATHODE ON THE PERFORMANCE OF MICROWAVE VACUUM TUBES
G. Ya. Levin, C. A. Churilova, V. G. Chumak
125-127
A possibility of reducing the effect of ionic bombardment on the operation of cathodes in vacuum electron tubes has been considered. The improvement can be reached by modifying the geometry of the cathode - emitting surface. Results of experimental investigations of millimeter and submillimeter wave clinotrons with such cathodes are presented. Such clinotrons show improved performance characteristics.
THE COMPARATIVE ANALYSIS OF DYNAMIC CHARACTERISTICS OF THE TWO-TRANSIT-REGIONS IMPATT GENERATOR IN THE TWO-FREQUENCIES REGIME FOR VARIOUS DIODE DOPING PROFILES AND GENERATION ZONES POSITIONS
A. Y. Osadchuk
128-134
Amplitude characteristics of the two-transit-regions IMPATT millimeter band diode in the two-frequencies regime have been obtained for various doping profiles and generation zones (IMPATT and spurious frequencies) positions. Proceeding from characteristics obtained, the stability of IMPATT generator in the two-frequencies regime was compared for above-mentioned variants and the conclusions were made about sensitivity of two-frequencies amplitude characteristics to variations of system parameters considered.
ELECTROMAGNETIC RADIATION GENERATION BY ELECTRONS IN THE CAVITY WITH CROSSED FIELDS UNDER CHERENKOV RESONANCE CONDITIONS
Yu. V. Kirichenko
135-140
A possibility of a electromagnetic wave generation by relativistic electrons rotating in crossed axial-magnetic and radial-electrostatic fields in a cylindrical cavity has been theoretically investigated. A dispersion equation describing the wave-electron interaction has been derived. It was demonstrated that the radiation can be generated under the Cherenkov resonance conditions. In this case, the electron velocity and the phase velocity of the waves are directed across the magnetic field. The wave increment as a function of the relativistic factor and the magnetic field shows maxima. This enables one to choose the optimum generation mode. Under certain conditions, the increment is strongly dependent on the dissipative processes. In some cases, the generation is possible only with losses due to the cavity wall absorption and radiation.
ON SOLVENT EFFECTS IN THE DYE LASER ACTIVE MEDIUM DOPED WITH BENZOPYRONE DERIVATIVES
V. V. Maslov
141-147
The influence of intermolecular interactions in solutions of laser dyes - benzopyrone derivatives on spectral-fluorescence and laser action characteristics of these dyes and the deactivation mechanisms of electron excitation of their molecules has been investigated. The effect of dye molecular structure on intermolecular interaction processes has been analyzed.
AUTOMATED SPECTROMETER FOR EMISSION SPECTRAL ANALYSIS
A. D. Yegorov, A. P. Motornenko, V. A. Yegorov, S. A. Yegorov, Ye. V. Zdor, V. G. Korzh, I. G. Skuratovsky
148-153
A high-voltage spark-discharge spectrometer for atomic spectrum analysis using a multi-cell photosensor and a personal computer has been designed and fabricated. The spectrometer capabilities are illustrated by the examples of obtaining the calibration charts with standard specimens to determine the concentration of a series of elements in different grades of steel.
EFFECT OF MILLIMETER WAVE ON THE CELLS OF BARLEY EMBRIO SEEDS
L. N. Golovina, T. A. Dolgova, Ye. B. Senkevich, N. G. Shestopalova
154-156
The present
paper considers the results of experimental studies of effects of different
temperature conditions on the synchronization of the first mitosis of shooting
seeds, which were preliminary exposed to radiation of millimeter wave band. The
microwave and 
-radiation
effects on the synchronism of plant cell division have been analytically
compared.
EFFECT OF LOW-LEVEL INTENSITY EHF RADIATION ON ENDURANCE AND REPRODUCTIVITY OF DROSOPHILA MELANOGASTER
V. G. Shakhbazov, B. M. Bulgakov, S. P. Sirenko, L. M. Chepel, O. I. Belous, A. I. Fisun
157-160
The effect of the low-intensity microwaves on three generations of the imago Drosophila melanogaster has been investigated out. The radiation source was tuned from 37 to 53 GHz. The thermoimmunity and reproductivity of the first generation of females and males of imago after processing by radiation. The obtained effect can be considered as physiological heterosis.