A quasioptical feed system for radioastronomical observations at millimeter wavelengths

Details A quasioptical feed system for radioastronomical observations at millimeter wavelengths A quasioptical feed system for radioastronomical observations at millimeter wavelengths

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977atttj..56.1483g&link_type=abstract

Bell System Technical Journal, vol. 56, Oct. 1977, p. 1483-1501.

Astronomy and Astrophysics

Astronomy

2

Antenna Feeds, Cassegrain Antennas, Microwave Antennas, Millimeter Waves, Sidelobe Reduction, Transmission Efficiency, Antenna Design, Antenna Radiation Patterns, Broadband, Low Noise, Mirrors, Mixing Circuits, Parabolic Reflectors, Radio Astronomy, Resonators

Scientific paper

A quasioptical feed system for use with a 7-meter Cassegrain antenna at millimeter wavelengths is described. Two offset parabolic mirrors couple the radiation from the F/D equals 5.7 antenna into the receiver feedhorn. A Fabry-Perot resonator operating at oblique incidence is used to inject the local oscillator energy into the signal path and to suppress response at the image frequency. The loss of the Fabry-Perot diplexer is 0.25 dB for the signal, while the coupling loss between the mixer waveguide flange and the main lobe of the antenna pattern should be not greater than 1 dB.

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