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Journals and Conferences
The last decade was characterised by the rapid development of satellite communication and broadcasting systems all over the world. It has caused the introduction of systems with frequency reuse and systems whose channel separation is based upon space selection, into the field of antenna technology. The development of such antennas and research of… (More)
The results of design of horn antennas with inhomogeneous waveguide as excitation device are considered. The experimental characteristics of the antenna radiation are shown and the results of horn antenna matching for 2.4 GHz radio networks are reported.
The former of ultrawideband signals with controlled time shift for the phased antenna array is developed. Formation of coherent harmonious signals with the necessary time shifts comparable to duration of a signal, is carried out by synthesizers of direct digital synthesis. Synchronization of synthesizers is carried out by signals of the common clock… (More)
In article results of working out of universal system of monitoring and managing are presented. The primary tasks solved by the multiservice system are listed. There are described the general principles of separate components construction intended for the decision of problems in the most important and interesting areas: medicine, objects guard, fire-control… (More)
In this report the results of designing of reflector antenna for transmission systems of the digital information with the usage of radiomodems in frequency band 2.4...2.485 GHz are presented. The detailed analysis of antenna feed device is carried out. The calculation of VSWR, input impedance and radiation characteristics are made. The outcome of… (More)
Wireless local networks of Wi-Fi standard, which are actively used presently, is supposed application nondirectional antennas. For the increase of efficiency of communication lines between user's terminals and access points it is better to use the directional antennas with the control radiation pattern. The results of theoretical and experimental research… (More)
The PSK signals modulator is designed on the basis of DDS. The problem of creation of the modulator is analyzed on the basis of several synthesizers; it is connected with realization of system of a clock signal distribution. The practical realizability of the modulator variant is shown on the basis of two synthesizers.
Some aspects of terminological correctness of the traditional term "pyramid horn antennas" that is widely used in antenna engineering are discussed. Performed analysis allows making a conclusion that "obelisk horn antennas" is a more correct term for the description of this type of antennas. As an example, this term is applied to the design and experimental… (More)
A reflector antenna for digital data transmission systems using 2.4...2.485 GHz radiomodems has been designed. The SWR, input impedance and directional characteristics have been calculated. Experimental studies of the antenna are described.