Step horn

A horn that has a relatively sudden change in cross sectional area in the region of the node, which is used to produce a high gain. The transition from a large cross-sectional area to a smaller area usually takes place via a radius.

Horns with a gradual change in area (e.g., catenoidal horns, exponential horns, conical horns) are not considered to be step horns.

Also called stepped horn.

See unshaped horn.