Noise reduction shield on a double-offset reflector antenna and its effect on antenna sidelobe structure

Author

Srikanth, S.

Author_Institution

Nat. Radio Astron. Obs., Charlottesville, VA, USA

Volume

2

fYear

1995

fDate

18-23 June 1995

Firstpage

881

Abstract

The Green Bank Telescope (GET) which is under construction at the Associated Universities, Inc./National Radio Astronomy Observatory (AUI/NRAO) site in Green Bank, WV. The telescope uses a double-offset geometry providing an aperture free of any blockage. The main reflector has a projected aperture of 100 meters in diameter. The subreflector is an ellipsoid of 7.5 meters in diameter. The telescope will operate from secondary focus at frequencies of 1.15 GHz and higher and will provide continuous coverage from 290 to 1230 MHz from prime focus. A study has been undertaken to install shields that will block the support arm structure and direct the spillover energy into the main reflector. This will alter the sidelobe structure in a controlled manner.

Keywords

antenna radiation patterns; antenna testing; offset reflector antennas; radiotelescopes; reflector antennas; 1.15 GHz; 290 to 1230 MHz; 3.75 m; 50 m; Associated Universities; Green Bank Telescope; National Radio Astronomy Observatory; antenna sidelobe structure; double-offset geometry; double-offset reflector antenna; ellipsoid; main reflector; noise reduction shield; prime focus; secondary focus; shields; spillover energy; subreflector; support arm structure; Apertures; Educational institutions; Ellipsoids; Frequency; Geometry; Noise reduction; Observatories; Radio astronomy; Reflector antennas; Telescopes;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 1995. AP-S. Digest

Conference_Location

Newport Beach, CA, USA

Print_ISBN

0-7803-2719-5

Type

conf

DOI

10.1109/APS.1995.530158

Filename

530158