Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978atttj..57.1257c&link_type=abstract
Bell System Technical Journal, vol. 57, May-June 1978, p. 1257-1288.
Astronomy and Astrophysics
Astronomy
8
Antenna Design, Antenna Feeds, Cassegrain Antennas, Communication Satellites, Millimeter Waves, Cross Polarization, Diplexers, Ground Stations, Horn Antennas, Radio Astronomy, Sidelobes, Wave Propagation
Scientific paper
A 7-meter offset Cassegrainian antenna with a precise surface has been built and tested. Measurements using a terrestrial source were made and compared with calculations for 19, 28.5, and 99.5 GHz. Low sidelobe level (less than or about equal to -40 dB) at one degree off the main beam and low cross polarization (less than or equal to -40 dB) throughout the main beam are achieved using a quasi-optical 19/28.5-GHz feed system that also demonstrates very low multiplexing loss (about 0.1 dB). The prime-focus gain measurement at 99.5 GHz found the difference between the measured and calculated gains to be 70.79 plus or minus 0.45 dB, which is consistent with the expected rms surface error of about 0.1 mm. Multiple-beam operation accommodates both propagation experiments with the Comstar beacons at 19 and 28.5 GHz and millimeter wave radio astronomy observations without physical disturbance of equipment.
Chu T. S.
England Richard W.
Gray Andrew D.
Legg W. E.
Wilson Richard W.
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