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 ElectroDynamic Systems Software ScientificTM Radiolocation Systems ResearchTM 
Antenna array Complex directional antenna consists of separate near-omnidirectional antennas (radiating elements) positioned in the space and driven by high-frequency … (from 'Glossary' of our web–site)  |
Archives for 2008Paged Sunday, April 06, 2008 at 12:04AM
We present a method for matching waveguide radiators used in wide bandwidth phased antenna arrays with wide-scanning 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 at the aperture, and also a matching device in the form of inductive rods and capacitive diaphragm.
Saturday, April 05, 2008 at 12:04AM
It is presented the electrodynamics analysis of complex cross-section waveguide phased-array antennas with dual polarization. Energetic, polarization and frequency characteristics of cross-ridged circular and square waveguides as elements in phased-array 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.
Friday, April 04, 2008 at 12:04AM
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 and frequency characteristics of these PAA in scanning sectors is included. An optimization method for the design of this kind of arrays in order to achieve broad frequency band and scanning sectors is also presented.
Monday, March 31, 2008 at 12:03AM
A mathematical model of a printed radiator pattern on a screen with finite dimensions is developed. Results of numerical experiments are presented.
Sunday, March 30, 2008 at 12:03AM
Approach for the analysis and Q–factor estimates of patch antennas with artificial dielectrics substrates for decimeter and larger wavelengths have been considered. Parameters range not leading to significant normal dispersion have been estimated and treated. Also shown that a frame of periodic system of capacitive elements aligned along the patch wedges provides smaller Q compared to the homogeneous dielectric substrate with the same equivalent permittivity. Implementation samples for the high accurate positioning with the help of the Global Navigation Satellite Systems are shown.
Saturday, March 29, 2008 at 12:03AM
The method for estimating the characteristics of longitudinal printed-circuit oscillators in phased arrays with the help of a model in the form of an infinite flat-plate array antenna.
Friday, March 28, 2008 at 12:03AM
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.
Thursday, March 27, 2008 at 12:03AM
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 the flat phased antenna arrays containing longitudinal printed radiators.
Wednesday, March 26, 2008 at 12:03AM
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.
Sunday, March 23, 2008 at 12:03AM
A short digest of the methods that are applied for antennae decoupling decreasing in the presence of an underlying surface is given. The computation results of weakly directional antennae decoupling with the help of periodic ribbed and strip structures located on an underlying surface along a coupling line for antennae are prezented; recommendations for the optimal (in a frequency range) construction of a deconpling structure are formulated. In this case some experimental data that confirm the possibility of the guarantee of a sufficiently high deconpling level by means of periodical structures are presented.
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