NDLI: Comparison of time-domain responses of reflector and phased array antennas

Content Provider	IEEE Xplore Digital Library
Author	Leatherwood, D.A. Corey, L.E. Cotton, R.B. Mitchell, B.S. Hampton, J.G.
Copyright Year	2000
Description	Author affiliation: Georgia Tech. Res. Inst., Atlanta, GA, USA (Leatherwood, D.A.)
Abstract	This paper describes findings from a research program to investigate the main beam and sidelobe impulse responses of large phased array antennas and reflector antennas typically used for radar applications. Particular emphasis is given to the way that the impulse response changes from the main beam to the sidelobe region of the antenna. Antennas are designed to radiate a plane wave with a given polarization and frequency in a specified main beam direction. However, the time-domain impulse response will vary according to the actual implementation of the antenna design. Reflectors are designed to collimate a radiated beam by creating equal path delays and tend to have few parts. This produces a relatively simple and short time-domain impulse response. A phased array, on the other hand, generally collimates the beam by adjusting phases instead of path delays. In addition, there are more parts, which introduce multiple reflections. This gives the phased array a more complicated and longer impulse response than a reflector. These time-domain effects affect the transmit and received waveforms and therefore the advanced signal processing algorithms such as adaptive digital beamforming (ADBF) and space-time adaptive processing (STAP). Georgia Tech Research Institute (GTRI) has instituted an internal research program to investigate the time-domain phenomenology of phased array antennas and develop computer simulation tools and measurement capability for characterizing these phenomena. Some comparisons of a reflector antenna and a series corporate-fed phased array are presented.
Starting Page	595
Ending Page	598
File Size	314971
Page Count	4
File Format	PDF
ISBN	0780363779
DOI	10.1109/ISAPE.2000.894857
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-08-15
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phased arrays Time domain analysis Antenna arrays Reflector antennas Radar antennas Collimators Delay Radar applications Directive antennas Polarization
Content Type	Text
Resource Type	Article

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