Reduction of baseline ripple in millimeter radio spectra by quasi-optical phase modulation

Details Reduction of baseline ripple in millimeter radio spectra by quasi-optical phase modulation Reduction of baseline ripple in millimeter radio spectra by quasi-optical phase modulation

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....82..337g&link_type=abstract

Astronomy and Astrophysics, vol. 82, no. 3, Feb. 1980, p. 337-339.

Astronomy and Astrophysics

Astronomy

2

Microwave Spectra, Millimeter Waves, Phase Modulation, Radio Astronomy, Ripples, Carbon Monoxide, Line Spectra, Radio Antennas

Scientific paper

The paper describes a technique for reducing the baseline ripple in radio spectral line observations which has been used on a Cassegrain system but which should be applicable to prime focus systems as well. It involves a low loss dielectric designed to produce a phase delay which shifts the standing wave pattern produced by reflections between the feed horn and subreflector area by one half-period. By observing with the dielectric in the beam half the time, this component of the baseline ripple on the 14 m FCRAO millimeter antenna is reduced by at least a factor of ten.

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