Diffraction analysis of a proposed dual-reflector feed for the spherical reflector antenna of the Arecibo Observatory

Details Diffraction analysis of a proposed dual-reflector feed for the spherical reflector antenna of the Arecibo Observatory Diffraction analysis of a proposed dual-reflector feed for the spherical reflector antenna of the Arecibo Observatory

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989rasc...24..601k&link_type=abstract

Radio Science (ISSN 0048-6604), vol. 24, Sept.-Oct. 1989, p. 601-617. Research supported by the Norwegian Telecommunications Adm

Physics

Optics

Antenna Feeds, Geometrical Optics, Physical Optics, Radio Astronomy, Spherical Antennas, Two Reflector Antennas, Antenna Design, Antenna Radiation Patterns, Astronomical Observatories, Circular Polarization, Cross Polarization, Diffraction, Gregorian Antennas

Scientific paper

A proposed dual-reflector feed for the spherical reflector antenna in Arecibo is presented. This is analyzed over a large frequency range: at the lower frequencies by physical optics (PO) integration, and at the higher ones by a geometrical optic (GO) ray tracing technique described in another work. The latter calculations are extended with the transition region theory (TRT) to include edge diffraction. The results clearly demonstrate the usefulness of the time efficient TRT method. However, they also show that PO integration is important, as this has detected an under illumination of the central region of the aperture. This effect is related to a similar problem with the line feeds, but can in the present case be reduced by moving the subreflectors away from the paraxial focus.

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