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Summary form only given. Calculated in the present work are the dependences of components of a GaN Gunn diode's microwave conductivity on frequency in the terahertz waveband.
A new highly effective Gunn diode is offered. The power and frequency characteristics of Gunn diodes with two active regions (InP/sub 0.7/As/sub 0.3/-In/sub 0.4/Ga/sub 0.6/As) are calculated. The greatest efficiency /spl sim/14% and flow of target capacity /spl sim/15.5 kW/cm/sup 2/ are received on the diode with blocking metal cathode at frequency /spl sim/55 GHz; the width frequency of a range is...
A double-drift (DD) millimeter wave IMPATT diode has been developed. Pulse output power was 5 W. The diode is intended for implementation in oscillators and amplifiers.
The signals coherent subtraction mode in the synchronized Gunn diode oscillator is theoretically described and experimentally investigated. We have detected high sensitivity of the investigated operation mode to the change of Gunn diode natural frequency and oscillation power. Coherent subtraction mode can be used in semiconductor synchronized microwave oscillators for the high-precise indication...
Considered in this paper is the model of a large-orbit M-type oscillator. Theoretical analysis of oscillator energy characteristics is conducted on shortening the operating wavelength.
Thuraya provides a GSM-based satellite telecommunications platform. This provides roaming via GSM networks all over the world. Coverage area: Europe, North and Central Africa, the Middle East and Indian subcontinent. Modulation /spl pi//4 QPSK. Channel bit rate is 46.8 kbps. 1.8 billion expected subscribers. Describes the possibility of multiple use of Thuraya space vehicle (SV). High energy potential...
Presents the results of experimental check of passive radio extender efficiency within cellular communication networks. There are several possible ways of communication assurance when mobile station (MS) is out of the coverage area of the base station (BS). The first of them offers microcell application, when two antennas are used along with the other BS equipment. The second method assumes the use...
For the last 5-6 years thousands of kilometers of RRL SDH have been created in Russia using the equipment of Siemens, Nera, NEC, Harris, Alcatel, and Fujitsu. In Russia such equipment is not produced yet. However, work in this field was conducted for many years by various enterprises. At present, two Russian enterprises "Radius-2" and "Microtex-Paging" are at the development and...
Some results of scientific elaboration and technical design of a local radio astronomical center of the Solar Service of Ukraine are given. The equipment at the Crimean Astrophysical Observatory will consist of the radio telescope RT-22 and three small radio telescopes.
VHDL has been shown to be an effective means of modeling complex electronic devices. Initially targeted as handling digital devices, it was later extended to Analog and Mixed Signal devices. In this paper, the authors show how VHDL can be extended further to accommodate microwave and RF modeling for use with Harmonic Balance Simulators. The authors refer to this extended modeling capability as VHDL-FD,...
Several techniques exist concerning the design of low-noise microwave amplifiers. Presented in this paper are the results of the design of low-noise microwave amplifier using GaAs Schottky barrier FETs. The possibility of the achievement of a minimum noise figure for different amplifiers is shown.
The practice of use of Ka-band therapy on consumptives of different stages is presented in this article. It is shown that for cases at any of the three stages of the disease an optimal method of treatment with Ka-band therapy exists. I.e. points and zones of influence, frequency, duration and quantity of sessions must be chosen. A description of these methods is presented.
The influence of microwaves on cell membrane permeability, chromatin condensation state and electrokinetic properties of human buccal cell nuclei was investigated. Microwave irradiation was found to induce increases in membrane permeability and chromatin condensation, and to decrease the electronegativity of the cell nuclei. The obtained data are discussed in connection with the mechanisms of microwave...
The results of bioelectric brain activity analysis by a nonlinear dynamics method based on the Grassberger-Procaccia algorithm are presented. It was observed that the preserving of the brain interhemisphere asymmetry was influenced by microwaves, but its degree is lower than in control mode. It was demonstrated that synchronization of oscillation processes for both brain hemispheres are possible after...
Presents the fundamental conceptual positions of creation of regional information networks on the basis of MITRIS system. It is shown, that such a network allows the establishment of a uniform teleinformation space in Ukraine.
The development of pulsed coherent semiconductor transmitters for the millimeter wave range has made possible the creation of a new generation of short distance radars having high resolution and interference immunity. This paper presents the results of the design and production of high power pulsed coherent Ka-band semiconductor transmitters having high frequency stability, low phase noise and fast...
Presented in this paper are the fragments of the review that reflect both perspectives and problems of satellite communication and broadcasting at the beginning of the third millennium. The fields of application of space telecommunication technologies are shown.
The possibility of increasing the efficiency of timber microwave processing by microwave power distribution optimization was studied. The latter was calculated for different polarization modes of radiation incident on the timber layer, which allowed us to determine optimal methods of layer irradiation.
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