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Antenna Array


Antenna array

Complex directional antenna consists of separate near-omnidirectional antennas (radiating elements) positioned in the space and driven by high-frequency …

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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 sizes are given....
Modified: 03/25/2008
Tags: analysis , transmitting , receiving , broadband , antenna array , AA
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... model of this antenna system is described and the results of numeric modeling are presented. Speaking about the effectiveness of various ways to provide ultrawidebandness and wide angleness of a receiving antenna system (AS), we should note that in an antenna array (AA) it is usually rather difficult to combine these two properties. The aim of this work is to suggest a variant of constructing of a receiving AA providing a wide band of operating frequencies and wide sector of operating angles simultaneously. Then,...
Modified: 11/17/2007
Tags: wideband , ribbon , antenna array , scanning , AA
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A method for solving boundary problems of electrodynamics for convex periodical antenna arrays by reduction to analogous boundary problems for flat surface using an iterative procedure is examined. The work ... ... , are vectors of electric and magnetic steady volume external “currents” caused by the curvature of the surface of the AA: (5) In the notation (5) — identity tensor, — tensor, covariant components of which are . If the carrier of exterior ...
Modified: 04/19/2007
Tags: iterative , method , calculation , electromagnetic , field , conformal , antenna array , AA
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Based on the solution of the boundary value problem for an infinite antenna array, a mathematical model of a finite flat antenna array in an infinite screen with impedance structure is built. Results of calculations are given by the example of radiant strips. In the work [1] based on the model of an infinite antenna ...
Modified: 01/01/2007
Tags: boundary effect , wideband , antenna array , AA , strip
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... When placing radiant strips over an optimized waveguide array, contact ratio in frequency up to 2 and more in sector of angles ±55° in main planes can be obtained. In the article [1] two requirements for radiant strips (RS) of a wideband wide-angle antenna array (AA) are formulated: they must have small electric sizes and be located in a plane, wave impedance Z of which satisfies the condition , where W =120π — wave impedance of the free space, in the entire working area. This article researches the ...
Modified: 12/14/2006
Tags: antenna array , rectangular , waveguide , AA
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... of rectangular printed–circuit radiators in plane phased arrays.— Interinstitute collection of scientific works. Machine design of microwave devices and systems.— M.: MIREA, 1981, p.58...77. (In Russian). Filippov V.S. Boundary waves in finite antenna arrays. Proceedings of institutes of MV and SSO USSR. Radioelectronics, 1985, t. 28, no.2, p.61...77. (In Russian). The radiator in question is a thin metallic plate, located on a single side of the dielectric substrate with dielectric permittivity ...
Modified: 01/31/2006
Tags: infinite , finite , antenna array , AA , vibrator , radiator
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