NDLI: Wideband beam forming with a rectangular array antenna

Content Provider	IEEE Xplore Digital Library
Author	Uthansakul, M. Bialkowski, M.E.
Copyright Year	2005
Description	Author affiliation: Sch. of Inf. Technol., Queensland Univ., Brisbane, Qld. (Uthansakul, M.; Bialkowski, M.E.)
Abstract	This paper presents a wideband beamformer which avoids the use of frequency filters or delay networks to steer a beam in azimuth over a wide frequency band. To achieve an approximately constant radiation pattern with frequency a rectangular, instead of linear, array of wideband planar monopoles is used. The required weighting coefficients, for signals at individual antenna elements, are real numbers which can be realized by attenuators or amplifiers. For an assumed radiation pattern, these weighting coefficients are determined by neglecting mutual coupling effects between the array elements. The effects of mutual coupling are then studied by performing a full EM analysis of the array. It is shown that mutual coupling degrades the side lobe level in the radiation pattern. To overcome this impairment, the method to compensate this adverse effect is described. The compensated weighting coefficients are determined and the radiation patterns are simulated. The modified weighting coefficients are complex numbers. They can be realized in practice by including quadrature hybrid circuits in addition to attenuators or amplifiers already present in the beamformer
Starting Page	63
Ending Page	66
File Size	316687
Page Count	4
File Format	PDF
ISBN	296005511X
DOI	10.1109/ECWT.2005.1617655
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-03
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	EUROPEAN MICROWAVE ASSOCIATION
Subject Keyword	Mutual coupling Attenuators Filters Azimuth Frequency Broadband antennas Linear antenna arrays Wideband Antenna arrays Antenna radiation patterns
Content Type	Text
Resource Type	Article

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