

Antenna array Complex directional antenna consists of separate nearomnidirectional antennas (radiating elements) positioned in the space and driven by highfrequency … (from 'Glossary' of our web–site) 
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Search on siteUse tags cloud or enter into field a search phrase and choose section of search. 1/ 2/ 3/ The thesis is devoted to designing broadband highly directional scanning antenna arrays based on waveguides with a complex (in general case, random) cross section working on a linear (vertical or horizontal) or double (orthogonal or circular) field polarizations in the monopulse mode.
The aim of the thesis comes down to solving ...
Modified: 08/14/2008
Tags: waveguide , antenna array , electrodynamic theory , mathematical apparatus Path: Home / Publications / Dissertations We present a method for matching waveguide radiators used in wide bandwidth phased antenna arrays with widescanning angle. In order to achieve matching, the following parameters are used: the geometrical parameters of waveguides, the dielectric parameters of materials inside the waveguides, waveguide transformators and reactive waveguide ...
Modified: 04/06/2008
Tags: waveguide , radiator , antenna array , broadband , scanning Path: Home / Publications / Archives It is presented the electrodynamics analysis of complex crosssection waveguide phasedarray antennas with dual polarization. Energetic, polarization and frequency characteristics of crossridged circular and square waveguides as elements in phasedarray antennas with dielectric covers and supports are studied. An analysis chart is introduced to aid the computation of their mode of operation with sector scanning and frequency band.
Antennas
Modified: 04/05/2008
Tags: broadband , waveguide , radiator , antenna array , PAA , polarization Path: Home / Publications / Archives Phased antenna arrays (PAA) of waveguides with complex cross sections are analyzed in this work. Particularly, the analysis focuses on linearly polarized waveguides with dielectric matching units (inserts, covers and waveguide transformers). The study of power ...
Modified: 04/04/2008
Tags: broadband , waveguide , radiator , antenna array , PAA , polarization Path: Home / Publications / Archives The method for estimating the characteristics of longitudinal printedcircuit oscillators in phased arrays with the help of a model in the form of an infinite flatplate array antenna.
Antennas
Modified: 03/29/2008
Tags: antenna array , model , method Path: Home / Publications / Archives The numerical research results of scattering characteristics of a microstrip–stubs reflectarrays, which have obtained due to a mathematical model, developed by the authors, are represented. The mathematical model of a reflectarray allows introducing into a construction of each microstrip element some shunts with controllable loads. It is shown, that due to shunts it is possible to control amplitude and phase of a scattering fields.
Antennas
Modified: 03/28/2008
Tags: model , microstrip , antenna array , field Path: Home / Publications / Archives The mathematical model of longitudinal printed radiators phased antenna array is developed based on integral equations method of electrodynamics. Numerical results and measurements of broadband microstrip radiators of the phased antenna arrays characteristics are presented. The obtained results can be used at designing ...
Modified: 03/27/2008
Tags: modeling , microstrip , antenna array , broadband , oscillator Path: Home / Publications / Archives The algorithm of estimating the density of surface magnetic current induced on the array aperture has been obtained as a result of the rigorous solution of the problem of plane wave diffraction on a double periodic array of stripline elements of any shape with passive loads.
Electromagnetic wave diffraction
Modified: 03/26/2008
Tags: wave , diffraction , current , antenna array Path: Home / Publications / Archives The principles of constructing antenna arrays (AA) and beam formers (BF) for broadband isolation increase between AA are formulated. The values of isolation levels for cosine and exponential amplitude distributions at the BFD outputs of microstrip broadband array antennas of various ...
Modified: 03/25/2008
Tags: analysis , transmitting , receiving , broadband , antenna array , AA Path: Home / Publications / Articles Asymptotic solution for the diffraction problem on a periodic array of microstrip radiators located above the surface of an infinite generalized cylinder, the curvature radius of which satisfies the condition of slow change along the guide, is considered. By using the matrix reflectivity coefficients, the problem is solved assuming the multilayer isotropic dielectric coating is present. For partial excitation the electric Green tensor function of Maxwell equations is written in closed form, which...
Modified: 11/24/2007
Tags: modeling , antenna array , microstrip , radiator impedance , surface , cylinder Path: Home / Publications / Archives 1/ 2/ 3/ Sort by relevance / Sorted by date 
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