Electronics, radio engineering and telecommunications

Simulation of Current-Voltage Characteristics of Triode Technological High Voltage Glow Discharge Electron Sources with Taking into Account Processes of Interaction of Charged Particles in Anode Plasma

TThe paper studies the problems of mathematical simulation of triode high voltage discharge gap and defines its current-voltage characteristics. We obtain analytical relations to calculate current voltage characteristics of triode high voltage glow discharge (HVGD) electron sources. The proposed calculation technique is based on analyzing charged particles balance in HVGD anode plasma taking into account the condition of self-dependence of its lighting. The model is very simple and universal.

Nanocrystalline Silicon thin Film Solar Cells

The aim of this paper is to determine advantages and disadvantages of replacing amorphous silicon by nanocrystalline one in thin film solar cells with different structures. Review of national and international literature has shown the effective technologic ways of replacing amorphous silicon by nanocrystalline one in each of three possible structures of photovoltaic cells: structure of a p-n-junction, cascade or multi-layered structure and НIT structure.

The Principles of Adaptive Interconnection for Open Systems

This paper develops the principles of adaptive interaction of open systems that minimize the administrative traffic and provide the integration of diverse traffic in convergent telecommunication networks. To this end, we employ the method of comparative analysis of benefits and open problems applied to the known concepts of NGN networks. We delineate three future generations of NGN networks with specific development stages and implementation of key technology solutions and ideas.

Construction Features of City Data Transmission Network Based on the MITRIS Technology

This paper presents possibilities of constructing the city data transmission networks on the microwave integrated multimedia systems of a multiservice radio access (MITRIS technology) basis using the cable standard DOCSIS modems. We describe and propose parameters of the system and its constituents: base station, repeaters, secondary concentrators, and the user's station. Also, we consider the competitiveness and specifics of implementing the data transmission city networks based on the MITRIS technology in the range of frequencies 10,15–10,30 and 10,50–10,65 GHz.

On Transport Layer Retransmission Timeout in Ad Hoc/Manet Networks

This article describes a key aspect of providing the reliability of the network transport layer TCP/IP based networks, such as a retransmission timeout. We are improving the efficiency of the transport mechanisms by adapting the retransmission timeouts of the transport protocol to the conditions of operation of self-organizing radio networks. The basis for the proposed new method for determining the retransmission timeout of packets is to calculate the timeout for each route individually, rather than the cumulative timeout packet-receipts.

Estimation of Time Delay in IP Networks and MPLS in Servicing Complex Messages in Сomplex Multitransit Communication Lines

We propose the analytical model of the guaranteed packets transfer in the IP/MPLS networks, aimed at finding the ways of accelerating the packet transmission via the transport network. We also estimate the effectiveness of IP and MPLS technologies by the network’s time delay in the process of packets transmit along the complex composite way. The size packet delay is calculated as a sum of delays on the complex way. A number of transit nodes, communication length expressed in a number of packets, and network congestion serve as variable parameters.

The Study of a Single-Element Dielectric Resonator Antenna In Case of Orthogonal Orientation of Dielectric Resonator Relative to Microstrip Line

The study introduces the design of a single-element dielectric resonator antenna fed by the microstrip line in case of orthogonal orientation of cylindrical dielectric resonator relative to a line. We demonstrate the results of measurements of basic characteristics of the antenna. In addition, we compare the experimental values of VSWR, theoretical analysis and the result of mathematical computer modeling of the device. We also represent the directivity patterns of the antenna.

The Research of Possibility of Signal Transmission by the COFDM Radio-Relay Line

We demonstrate the results of theoretical and experimental research at the transmission of the COFDM signal on a radio-relay line with the use of the “Evrika equipment” in the range of frequencies 12,75–13,25 GHZ. We also study the influence of nonlinear distortions in a passing block on the spectrum of outgoing signal at the change of the entrance power level. We elaborate the chart of conducting the measuring of nonlinear channel distortions of transmission of the radio-relay station.

Estimation the Sensitivity of Receiver that Implements “Non-Energetic” Method of Signal Reception

In this paper, the impulse radio UWB receiver sensitivity is estimated. The receiver implements “non-energetic” method of signal reception which provides pulses selection with amplitude that exceeds the root mean square value of noise and interference rather than accumulation of received pulses energy. Selected pulses are used to start a generator of pulses with a longer duration and higher amplitude. The latter are processed by a passive match filter.

Effect of thin Film Dielectric Barrier Parameters on the Ozonizer Characteristics

The aim of this paper is to investigate the influence of properties of thin films and glass dielectric barriers (thickness from 8 um to 1 mm) on the ozonizer characteristics and choose the best. This paper presents experimental results on the effect of parameters of dielectric barriers made from polymeric materials (Lavsan, Teflon), quarts glass as well as SiO2 thin films, deposited by the reactive electron-beam vaporization on the ozonizers characteristics. Experimental results show that the dielectric barrier breakdown voltage decreases with roughness of electrode surface under dielectric.