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Offset dish antenna
From Wikipedia, the free encyclopedia
An offset dish antenna is a type of satellite dish. It is so called because the antenna feed is offset to the side of the reflector, in contrast to a typical circular parabolic antenna where the feed is in front of the center of the reflector.
The offset dish antenna still uses a parabolic dish with the driven element at the focus of the parabola; however, the curve of the dish is taken from one side of the parabola instead of the center.
Offset fed antennas are most commonly found on Ku Band DBS satellite dishes or ‘mini-dishes’. The benefit of the offset configuration is that it positions the feed horn away from the dish itself so that it does not cast a shadow on the dish. Offset dishes are often referred to as ‘asymmetrical’.
- Offset-fed Parabolic Dish Antennas by Paul Wade