Homology Parameters for Large Axisymmetric Shaped Dual-Reflector Antennas

We extend the concept of best-fitting paraboloids for large single and dual reflectors with conic-section surfaces to best-fit shaped surface for large dual reflectors shaped for uniform amplitude distribution. The point focus of the paraboloidal main reflector is replaced by focal lines for the mai...

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Bibliographic Details
Published inIEEE transactions on antennas and propagation Vol. 65; no. 7; pp. 3392 - 3398
Main Authors Ban, You, Duan, Baoyan, Wang, Congsi, Wang, Wei, Feng, Shufei, Xiang, Binbin
Format Journal Article
LanguageEnglish
Published New York IEEE 01.07.2017
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Antennas
Apertures
Feeds
Fitting
Gravitation
Homology
Homology parameters
Least squares method
Mean square values
Reflector antennas
Reflectors
root mean square (rms)
shaped dual-reflector antennas
Surface fitting
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Summary:We extend the concept of best-fitting paraboloids for large single and dual reflectors with conic-section surfaces to best-fit shaped surface for large dual reflectors shaped for uniform amplitude distribution. The point focus of the paraboloidal main reflector is replaced by focal lines for the main reflector and the primary subreflector focus, whereas the secondary subreflector point focus at the feed is kept. The reflector surfaces are shaped, and all rays from the main-reflector aperture to the feed meet an equal-path-length condition. This condition may be represented by a set of "homology parameters" determined by a least-squares method. Finally, we calculate the homology parameters and the root mean square of surface errors for an 8-m dual-reflector system including gravity effects for the antenna pointed toward zenith and the horizon.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2017.2700230