Patent ID: 6522305
Filing Date: 2003-02-18
Classification: H01Q

Abstract:
A dual-reflector microwave antenna comprisinga main reflector having a shape that is a portion of a paraboloid generated by revolution of a parabola around having a single, common axis of rotation and symmetry, a primary feed extending along said axis on the concave side of the main reflector and having an aperture spaced away from said main reflector, and a subreflector located beyond the end of said primary feed for reflecting radiation from the main reflector into the primary feed and for reflecting radiation from the primary feed onto the main reflector, said subreflector having an image-inverting surface configuration that has a ring focus located between the main reflector and the subreflector and extending around said axis of revolution of said paraboloid, said ring focus having a diameter at least as large as the diameter of the aperture of said primary feed.