The negligible effect of non-Gaussian surface deviations in large MM-Lambda reflectors' aperture efficiency and the performance of Itapetinga 45-ft antenna at Lambda = 3.3 MM

Details The negligible effect of non-Gaussian surface deviations in large MM-Lambda reflectors' aperture efficiency and the performance of Itapetinga 45-ft antenna at Lambda = 3.3 MM The negligible effect of non-Gaussian surface deviations in large MM-Lambda reflectors' aperture efficiency and the performance of Itapetinga 45-ft antenna at Lambda = 3.3 MM

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8626488k&link_type=abstract

Unknown

Physics

Optics

Antennas, Cassegrain Optics, Errors, Predictions, Reflectors, Surface Properties, Telescopes, Brightness Temperature, Iterative Solution, Mechanical Measurement, Radiometers, Temperature Measurement

Scientific paper

The aperture efficiency at lambda = 3.3 mm of the 45-ft Itapetinga reflector was found to be about 25 percent. This radiometric result suggests an equivalent surface accuracy of less than 0.25 mm, root-sum-square (rss), assuming a Gaussian distribution of errors, which is smaller than the actual rss estimated for the dish, and represents a 5 dB improvement in gain. This result confirms that non-Gaussian errors across a smooth surface have negligible effects on the aperture efficiency, and that antenna efficiency may be predicted from mechanical measurements when the slowly varying errors across the source are known. It is possible to predict that relatively simple mechanical readjustments of the reflector and subreflector may raise its efficiency to 30 percent.

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