Datoteka:Parabolic antenna types2.svg

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Sažetak

Opis
English: Diagram showing the most common types of parabolic antenna feeds.
The reflecting surfaces are shown in red, the feed antenna in green, and typical supporting structures in blue. A few typical rays are shown, in black. The types are:
  1. Axial or front feed This is the most common type, with the feed antenna suspended in front of the dish on the beam axis, at the focal point, pointed back toward the dish. One drawback of this type is that the feed and its supports partially block the beam.
  2. Off-axis feed or offset-feed The primary reflector is asymmetric, with the focus, and the feed, located to one side, outside the beam area. This avoids the problem of the feed obstructing the beam. It is used in home satellite dishes.
  3. Cassegrain In this design, the feed is located on or behind the dish, and its beam illuminates a small hyperboloidal secondary reflector at the focus of the dish, which reflects the beam back to the parabolic dish. It is used in antennas with bulky or complicated feeds, such as satellite ground antennas and radio telescopes.
  4. Gregorian This is similar to the Cassegrain, except the secondary reflector has a concave ellipsoidal shape.
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Izvor Vlastito djelo
Autor Chetvorno
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Opisi

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A diagram showing the most common types of parabolic antenna feeds.

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URL Bosanski: https://commons.wikimedia.org/wiki/user:Chetvorno
suradničko ime na Wikimediji Hrvatski: Chetvorno
ime autora Hrvatski: Chetvorno

nastanak

25. novembra 2010

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Datum/vrijemeMinijaturaDimenzijeKorisnikKomentar
aktualna13. jula 2011. u 06:43Minijatura verzije (13. jula 2011. u 06:43)850 × 1820 (23 KB)wikimediacommons>ChetvornoAdded to label for "axial feed" antenna a more common name for this type of feed: "front feed"

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