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 ?
Don't misunderstand me," says Rebecca, who exposes disgusting hygiene in some of Britain's top eateries in ITV's new series Dishing The Dirt.
However, when it comes to the celebrities on everybody's lips, it's Victoria Beckham (23%), Angelina Jolie (18%) and David Beckham (17%) that British women most love dishing the dirt on.
is an eight-part series, dishing the dirt on some of Britain's grottiest houses.
WOMEN are better at dishing the dirt on their cars.
We were hoping this new Robson Green (above) show would be the one-time Soldier Soldier star dishing the dirt on all his fellow Geordies, such as Gazza, Cheryl Cole, Sting or Ant & Dec.
99 but you can win a copy by sending us a short, true story dishing the dirt about you or a pal.
I'll be dishing the dirt on what went on behind the smiles and posed photographs during my training programmes with various Merseyside sporting clubs and also publishing plenty of pictures that never quite made it into my weekly sports column.
IT made a change from dishing the dirt on each other as housemates performed a big clean-up yesterday.
When it comes to dishing the dirt, celebrity secrets are a favourite among British men and women (37%), with 12% of women actually admitting to being addicted to celeb gossip.
Anyhow, the best she can do on dishing the dirt on poor Micky 'The Nose' is that they did have sex, and then things started to turn ugly.
He suggested he would be dishing the dirt on his fourdecade-long career.
TWENTY five years after his death, and 37 years after the break-up of their marriage, Cynthia Lennon is dishing the dirt on her ex-Beatle husband.