File:Parabolic antenna types2.svg

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

Summary[edit]

Description
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.
Date
Source Own work
Author Chetvorno
Permission
(Reusing this file)		 I, Chris Burks (Chetvorno), the author of this work, release it into the public domain for any use whatever.
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Date/TimeThumbnailDimensionsUserComment
current05:43, 13 July 2011Thumbnail for version as of 05:43, 13 July 2011850 × 1,820 (23 KB)Chetvorno (talk | contribs)Added to label for "axial feed" antenna a more common name for this type of feed: "front feed"
14:39, 2 December 2010Thumbnail for version as of 14:39, 2 December 2010850 × 1,820 (22 KB)Chetvorno (talk | contribs)Made rays thicker
11:33, 26 November 2010Thumbnail for version as of 11:33, 26 November 2010850 × 1,820 (21 KB)Chetvorno (talk | contribs)Increased size of font for readability
01:10, 26 November 2010Thumbnail for version as of 01:10, 26 November 2010800 × 1,930 (21 KB)Chetvorno (talk | contribs)== Summary == {{Information |Description={{en|Diagram showing types of parabolic antenna feeds.}} |Source={{own}} |Date=2010-11-25 |Author=Chetvorno |Permission=I, Chris Burks (Chetvorno), the author of this work, rel

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