Other
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jeeea...2..193f&link_type=abstract
Journal of Electrical and Electronics Engineering, Australia, vol. 2, Dec. 1982, p. 193-201. Research supported by the Radio Re
Other
1
Antenna Design, Millimeter Waves, Multibeam Antennas, Radio Telescopes, Antenna Feeds, Geometry, Sidelobes, Subreflectors
Scientific paper
The geometric constraints related to annular synthesis telescopes and other aspects related to their realization are reported. Flat subreflectors for the unit-collecting areas of annular synthesis telescopes can be used in the regime where the ratio of D (the overall diameter of the annular synthesis telescope) to lambda is greater than or equal to 150; the curved subreflectors can be used in the regime where this radio is less than or equal to 17,000. It is shown that high-quality hybrid mode feeds having a small flare angle can be used to illuminate the unit-collecting areas of annular synthesis telescopes. The considerable isolation between adjacent feeds illuminating the unit-collecting areas of annular synthesis telescopes can be obtained without decreasing the number of independent antenna beams realizable.
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