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Phased array feed (PAF) is an emerging technology which can greatly improve the survey speed of telescopes. As a world-class radio telescope, the Five-hundred-meter Aperture Spherical radio Telescope (FAST) is also trying to enhance its observation capability and open up new scientific studies at several frequency bands by PAFs. At the first partof this paper, the blue print of the FAST PAFs development...
Sensitivity, one of the most important parameter of a radio telescope, is highly depended on the dish optical design for a dish-type telescope. This paper presents several ways to improve the sensitivity, i.e., higher aperture efficiency and lower noise temperature in dish optical design, for example, dish optical configuration selection, beam shaping, and reflector extension.
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