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Scanning properties of large dual-shaped offset and symmetric reflector antennasSeveral characteristics of dual offset (DOSR) and symmetric shaped reflectors are examined. Among these is the amelioration of the added cost of manufacturing a shaped reflector antenna, particularly a doubly curved surface for the DOSR, if adjustable panels, which may be necessary for correction of gravity and wind distortions, are also used for improving gain by shaping. The scanning properties of shaped reflectors, both offset and circularly symmetric, are examined and compared to conic section scanning characteristics. Scanning of the pencil beam is obtained by lateral and axial translation of a single point-source feed. The feed is kept pointed toward the center of the subreflector. The effects of power spillover and aperture phase error as a function of beam scanning is examined for several different types of large reflector designs including DOSR, circularly symmetric large f/D and smaller f/D dual reflector antenna systems. It is graphically illustrated that the Abbe-sine condition for improving scanning of an optical system cannot, inherently, be satisfied in a dual-shaped reflector system shaped for high gain and low feed spillover.
Document ID
19920063346
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Galindo-Israel, Victor
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Veruttipong, Watt
(JPL Pasadena, CA, United States)
Norrod, Roger D.
(National Radio Astronomy Observatory Green Bank, WV, United States)
Imbriale, William A.
(JPL Pasadena, CA, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1992
Publication Information
Publication: IEEE Transactions on Antennas and Propagation
Volume: 40
Issue: 4, Ap
ISSN: 0018-926X
Subject Category
Communications And Radar
Accession Number
92A45970
Distribution Limits
Public
Copyright
Other

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