Quasioptical coupling of Gaussian beam systems to large Cassegrain antennas

Details Quasioptical coupling of Gaussian beam systems to large Cassegrain antennas Quasioptical coupling of Gaussian beam systems to large Cassegrain antennas

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ijimw...7.1511l&link_type=abstract

International Journal of Infrared and Millimeter Waves (ISSN 0195-9271), vol. 7, Oct. 1986, p. 1511-1536.

Astronomy and Astrophysics

Astronomy

7

Beams (Radiation), Cassegrain Antennas, Optical Coupling, Radio Astronomy, Radio Telescopes, Antenna Feeds, Defocusing, Horn Antennas, Interferometers, Mirrors, Point Sources

Scientific paper

Expressions for the coupling between Gaussian beam modes and the field in a Cassegrain antenna produced by a distant point source are presented. These are used to obtain parameters relating to the performance of quasi-optical systems which are used on radio telescopes. Initial consideration is given to a single fundamental Gaussian mode which is used to derive the aperture efficiency and defocusing properties of an ideal 'Gaussian feed'. Higher order Gauss-Laguerre modes are subsequently included and used to ascertain the efficiency of an antenna fed by a corrugated horn.

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