Offset dish antenna

With an offset parabolic reflector antenna of the is an excerpt from a paraboloid. The pathogen ( a horn antenna ) and its holder are located outside the main radiation direction and can thus not negatively influenced by " shadowing " the antenna pattern.

Of the excitation light both upwards into a Parabolreflektorausschnitt and the lower half of the parabolic mirror is not used. The mirror surface is not circular but elliptical, so that it is better illuminated because of the offset of the pathogen. The exciter corrugated horn radiators are mostly used.

Offset antennas are primarily used in satellite broadcast reception systems. Here the advantage of an offset antenna lies in the fact that the reflector can be mounted almost vertically despite typical of Central Europe by about 30 ° upward receive direction, so that can not collect snow on the reflector in winter, which would significantly degrade the reception.