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Analysis of near-field Cassegrain reflector - Plane wave versus element-by-element approachA near-field Cassegrain reflector (NFCR) is an effective way to magnify a small phased array into a much larger-aperture antenna for limited scan applications. Traditionally the pattern analysis of NFCR is based on a plane wave approach, which simplifies the computation tremendously, but fails to provide design information about the most critical component of the whole antenna system, the feed array. Currently available computers make it possible to calculate the pattern of an NFCR by a more exact element-by-element approach. Each element in the feed array is considered individually, and the diffraction pattern from the subreflector is calculated by the geometrical theory of diffraction (including uniform theories at the shadow boundaries). The field contributions from all elements are superimposed at the curved main reflector surface, and a physical-optics integration is performed to obtain the secondary pattern.
Document ID
19900060384
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Houshmand, Bijan
(Illinois Univ. Urbana, IL, United States)
Lee, Shung-Wu
(Illinois, University Urbana, United States)
Rahmat-Samii, Yahya
(California, University Los Angeles, United States)
Lam, Peter T.
(Deskin Research Group Santa Clara, CA, United States)
Date Acquired
August 14, 2013
Publication Date
July 1, 1990
Publication Information
Publication: IEEE Transactions on Antennas and Propagation
Volume: 38
ISSN: 0018-926X
Subject Category
Communications And Radar
Accession Number
90A47439
Distribution Limits
Public
Copyright
Other

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