File:Parabolic antenna types.png

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Parabolic_antenna_types.png (187 × 572 pixels, file size: 9 KB, MIME type: image/png)

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Summary

Description
English: Parabolic antenna types; three main types of parabolic antenna
  • Center fed: The feed antenna is at the focus of the antenna, on the beam axis.
  • Off-axis: The reflector is an asymmetric segment of a parabolic surface so the focus is off the beam axis, outside the beam area. This prevents the feed structure and its supports from blocking part of the beam.
  • Gregorian: The feed is located on or behind the center of the primary reflector. Its beam illuminates a concave secondary reflector at the focus, which reflects the beam back toward the primary reflector, This is mistakenly labelled "Cassegrain"; Cassegrain antennas have a convex secondary reflector.
Date
Source Miikka Raninen
Author Miikka Raninen


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Date/TimeThumbnailDimensionsUserComment
current23:45, 14 April 2006Thumbnail for version as of 23:45, 14 April 2006187 × 572 (9 KB)wikimediacommons>Ransu~commonswikiParabolic antenna types: Parabolic, Off-center and Cassegrain. Miikka Raninen 2006.
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