File:Parabolic antennas ru lands.svg

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Captions

Captions

Diagram showing the most common types of parabolic antenna feeds. landscape orientetion

Summary

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Description
Русский: Основные типы зеркальных параболических антенн:
  1. Однозеркальная прямофокусная. Облучатель расположен перед параболическим зеркалом, в его фокусе. Облучатель и его крепления затеняют часть зеркала.
  2. Однозеркальная офсетная, асимметричный рефлектор, полученный вырезкой с края параболического зеркала. Облучатель расположен в точке фокуса с края антенны и не затеняет собой зеркало. Наиболее распространенный тип для спутниковых антенн небольшого размера, в частности антенн спутникового ТВ. По офсетной схеме могут быть выполнены также двухзеркальные антенны.
  3. Двухзеркальные, с облучателем, расположенным со стороны основого зеркала и дополнительным контррефлектором, по схемам Кассенгерна (гиперболический контррефлектор), Грегори (эллиптический контррефлектор) и производный от офсетной со схемой Грегори вариант схемы с кольцевым фокусом (контррефлектор в виде конуса с эллиптической образующей).
English: Diagram showing the most common types of parabolic antenna feeds.
  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. Offset feed can also be used in multiple reflector designs such as the Cassegrain and Gregorian, below.
  3. Feed with secondary reflector. In in these designs the feed is located on or behind the dish, and its beam illuminates a small secondary reflector. Cassegrain design use hyperboloidal secondary reflector, in Gregorian design the secondary reflector has a concave ellipsoidal shape, one of possible Ring focus designs is derived from Gregorian offset and uses elliptical conical secondary reflector.
Date
Source This file was derived from: Parabolic antenna types2.svg: 
Author Vsatinet


This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Translated to Russian, Ring focus design is added, Orientation is changed. The original can be viewed here: Parabolic antenna types2.svg: . Modifications made by Vsatinet.

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