Fitxer:Parabolic antenna types2.svg

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Resum

DescripcióParabolic 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.
Data	25 de novembre de 2010
Font	Treball propi
Autor	Chetvorno
Permís (Com reutilitzar aquest fitxer)	I, Chris Burks (Chetvorno), the author of this work, release it into the public domain for any use whatever.
Altres versions	Derivative works of this file: Parabolic antenna types2 fr.svg Parabolic antennas 2.svg Parabolic antennas.png
SVG genesis InfoField	El codi font d'aquest SVG és vàlid. Aquesta imatge vectorial ha estat creada amb Inkscape. This diagram uses embedded text that can be easily translated using a text editor.

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Historial del fitxer

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	Data/hora	Dimensions	Usuari/a	Comentari
actual	07:43, 13 jul 2011	850 × 1.820 (23 Ko)	Chetvorno	Added to label for "axial feed" antenna a more common name for this type of feed: "front feed"
	16:39, 2 des 2010	850 × 1.820 (22 Ko)	Chetvorno	Made rays thicker
	13:33, 26 nov 2010	850 × 1.820 (21 Ko)	Chetvorno	Increased size of font for readability
	03:10, 26 nov 2010	800 × 1.930 (21 Ko)	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