Fan-beam antenna
![Side and frontal view of the beam produced](/Images/godic/202501/12/Fan1p2408.gif")
![Circular paraboloid (red) and its truncated reflector (green).](/Images/godic/202501/12/Fan_beamp2408.jpg")
![AN/FPN-36 radar, with search (left) and height-finding (right)](/Images/godic/202501/12/Radarantenne_FPN-362408.jpg")
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.)