Patent ID: 6396441
Filing Date: 2002-05-28
Classification: H01Q

Abstract:
A dual band antenna comprising:(i) a single band antenna arranged to operate in a first frequency band and with a first beamwidth; and (ii) a plurality of single band, directly radiating, antenna elements arranged to operate at a second frequency band; and wherein said single band antenna elements are positioned around said single band antenna such that they operate together in use with a second beamwidth approximately equal to said first beamwidth; and wherein said plurality of single band antenna elements comprise a flat-plate array comprising a distribution network layer comprising a plurality of probes co-planar with the distribution network layer; said distribution layer being positioned under, substantially parallel to, and spaced apart from a plate of electrically conducting material comprising a plurality of apertures positioned such that each aperture is above a probe; said single band antenna and single band antenna elements having substantially co-planar radiating apertures together forming an aperture of the dual band antenna, and said flat-plate array and distribution network layer being substantially parallel to said aperture of the dual band antenna.