Patent ID: 7385552

Claim:
A method of receiving millimeter wave radiation, said method including the steps of: scanning a field of view using a fan beam to receive millimeter wave radiation; rotating polarization of incident millimeter wave radiation through 90 degrees using at least one polarization rotating transflector; and scanning said field of view using another fan beam to receive said polarization-rotated millimeter wave radiation, said fan beams intersecting and being geometrically orthogonal to each other, and said radiation being co-polarized, said fan beams are provided by respective fan beam antennas, each fan beam antenna being a modified pill-box antenna including: a metal housing with an elongated aperture in at least one side of said housing; a curved primary reflector surface located within said housing and opposite said aperture; a feed horn within said housing; and one or more sub-reflectors for coupling said feed horn to said primary reflector surface, at least one of said sub-reflectors being designed to rotate and providing one-dimensional beam scanning in a narrow direction of said other fan beam.