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Reflector antennas us a reflective object as intermediary between the radiating element and the far field pattern. For example: a corner reflector with a dipole or parabolic with a horn feed.

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A piece of metal in space.

Reflector Antenna Diagram

A Plane Reflector

Usually a source antenna situated over reflective plane. The apex location and the angle between the planes determine the radiation pattern

Plane

A Corner Reflector

Usually a dipole antenna situated between two reflective planes. The apex location and the angle between the planes determine the radiation pattern

Corner