File:Parabolic antenna types2.svg

Original file (SVG file, nominally 850 × 1,820 pixels, file size: 23 KB)

This is a file from the Wikimedia Commons. Information from its description page there is shown below.
Commons is a freely licensed media file repository. You can help.

Any autoconfirmed user can overwrite this file from the same source. Please ensure that overwrites comply with the guideline.

Summary

DescriptionParabolic antenna types2.svg	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: 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. 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. 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. Gregorian This is similar to the Cassegrain, except the secondary reflector has a concave ellipsoidal shape.
Date	25 November 2010
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.
Other versions	Derivative works of this file: Parabolic antenna types2 fr.svg Parabolic antennas 2.svg Parabolic antennas.png
SVG development InfoField	The SVG code is valid. This diagram was created with Inkscape. This diagram uses embedded text that can be easily translated using a text editor.

Licensing

I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
In some countries this may not be legally possible; if so:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

File history

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Dimensions	User	Comment
current	05:43, 13 July 2011	850 × 1,820 (23 KB)	Chetvorno	Added to label for "axial feed" antenna a more common name for this type of feed: "front feed"
	14:39, 2 December 2010	850 × 1,820 (22 KB)	Chetvorno	Made rays thicker
	11:33, 26 November 2010	850 × 1,820 (21 KB)	Chetvorno	Increased size of font for readability
	01:10, 26 November 2010	800 × 1,930 (21 KB)	Chetvorno	== 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