Berkas:Parabolic antenna types2.svg

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Deskripsi
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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Sumber Karya sendiri
Pembuat Chetvorno
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A diagram showing the most common types of parabolic antenna feeds.

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sejak

25 November 2010

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terkini13 Juli 2011 06.43Miniatur versi sejak 13 Juli 2011 06.43850 × 1.820 (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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