dish

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dish

A type of antenna used in radio telescopes and consisting of a large spherical or parabolic metal reflector, usually circular in outline, by means of which radio waves are brought to a focus above the dish center. The waves are collected at the focus by a secondary antenna, called a feed, or are reflected from a curved secondary to be brought to a focus elsewhere (see Cassegrain configuration). At low radio frequencies the feed may be a dipole mounted in front of a small reflector; at high frequencies it is usually a horn antenna (see waveguide). The signals picked up by the feed are transferred by means of the feeder to the receiver for amplification and analysis. Both the angular resolution and the sensitivity of the telescope to a point source increase with the area of the dish.

The dish is usually mounted so that it can be steered to point in different directions and can be made to track a moving object. Some dishes, however, can move in only one coordinate and rely on the Earth's rotation to provide coverage in the other coordinate. The 305-meter dish mounted in a natural hollow in the ground at the Arecibo radio telescope, Puerto Rico, achieves partial beam steering by moving the feed.

dish

[dish]
(electromagnetism)

dish

A parabolic reflector type of radio or radar antenna.

dish

A bowl-shaped antenna that receives signals from a satellite. See DBS and parabolic antenna.
References in periodicals archive ?
THE KILLERS O2 Arena, London DISHING out high-fives to the front row after the final song was singer Brandon Flowers' way of rewarding the fans and showing how thankful he was to be back in action.
A banking watchdog is dishing out huge bonuses to a handful of top staff despite being axed over its botched handling of the credit crunch.
He is not averse to dishing out misguided and inaccurate criticism, but he reacts badly when criticism is directed at his own actions, as he shows regularly during PM's Question Time in Parliament.