Fan-beam antenna
Directional antenna / From Wikipedia, the free encyclopedia
A fan-beam antenna is a directional antenna producing a main beam having a narrow beamwidth in one dimension and a wider beamwidth in the other dimension. This pattern will be achieved by a truncated paraboloid reflector or a circular paraboloid reflector. Since the reflector is narrow in the vertical plane and wide in the horizontal, it produces a beam that is wide in the vertical plane and narrow in the horizontal. (The larger the antenna dimension, the narrower the beam.)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/50/Fan1p.gif/320px-Fan1p.gif)