Microwave reflector assembly

A reflective assembly for use in an antenna for receiving an incident microwave signal having a wavelength .lambda., comprising a sequence of microwave reflective surfaces facing in a common direction, each said reflective surface being at least a portion of a concave surface of one of a corresponding sequence of paraboloids that have a common axis and a common focal point, and means for mounting said reflective surfaces in an array such that when said incident microwave signal is received parallel to said axis, each reflective surface reflects said incident microwave signal as a reflected microwave signal onto said common focal point, wherein each reflected microwave signal arrives at said common focal point in-phase with each other of said reflected microwave signals;

• wherein the focal length of each paraboloid differs by m.lambda./2 from the focal length of a paraboloid directly adjacent in the sequence of paraboloids, where m is a non-zero integer;
• and wherein said means for mounting said sequence of microwave reflective surfaces forms a region which is bounded by first and second major surfaces which are spaced an equidistance apart and edge surfaces and wherein said first and second major surfaces cut the concave surface of each paraboloid in said sequence of paraboloids such that each reflective surface of said sequence of reflective surfaces totally lies within said region.