Potter horn antenna

Image of the Potter horn antenna.

The Potter horn (not to be confused with the vuvuzela used in the recent FIFA world cup in South Afrca) was first suggested by P. D. Potter in 1963 and is very popular in applications where a radiation pattern with suppressed sidelobes and equal E- and H-beamwidths are required with minimal complexity of manufacture.

As with the Corrugated conical horn, the Potter horn achieves complete beamwidth equalization in all planes, complete phase centre coincidence, and at least 30 dB sidelobe suppression in the electric plane over a narrow operating band; using a technique referred to as dual-mode excitation. This is achieved without the need of an OMT (orthogonal mode transducer) feed or corrugations in the structure. Although the Potter horn is longer than the corrugated horn, it has smooth walls and is much simpler to manufacture, particularly for higher frequency applications.

The following image shows typical normalized E- and H- plane patterns of a Potter horn, illustrating the beamwidth symmetry.

Typical normalized E and H plan patterns of the Pottern horn having identical main lobes.