Abstract: A compact electromagnetic antenna pattern range includes a planar reflector which is controllable between a reflective condition and a transmissive condition. The controllable reflector is placed parallel to a second planar reflector, and a pulse of electromagnetic energy is injected into the space between the reflectors, propagating toward one of the reflectors. After a number of re-reflections, the controllable reflector is rendered transmissive and a substantially planar wavefront is made available for application to the antenna under test.

Abstract: An array of flared horn antennas is adapted to be fed from circular waveguide. The apertures of the horns are closely spaced. Prior art horns with circular apertures leave gaps in the aperture. The gaps are eliminated, and the gain of the array is increased by about 1/2 dB by tapering the horns from a circular cross-section at the feed end to a hexagonal cross-section at the radiating aperture end.