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| Keywords: Parabolic antenna types2.svg Diagram showing the most common types of parabolic antenna feeds The reflecting surfaces are shown in <font color red >red</font> the feed antenna in <font color green >green</font> and typical supporting structures in <font color blue >blue</font> 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 own 2010-11-25 Chetvorno I Chris Burks Chetvorno the author of this work release it into the public domain for any use whatever Parabolic antenna types2 fr svg Parabolic antennas Antenna diagrams | ||||
