Patent ID: 7576696

Claim:
An antenna system comprising at least two antenna assemblies, wherein: a first antenna assembly of said antenna system is tuned to a first frequency band ν1 and comprises a first array of antenna elements rotatable about a phase control axis orthogonal to the plane of the first array, a first electrical ground plane electromagnetically coupled to said first array of antenna elements, and a first transmission network conductively coupled to said first array of antenna elements; a second antenna assembly of said antenna system is tuned to a second frequency band ν2; said first ground plane is configured as a frequency selective surface that is substantially reflective of radiation in said first frequency band ν1 and substantially transparent to radiation in said second frequency band ν2; and said first and second antenna assemblies are incorporated within said antenna system such that said first antenna assembly is positioned to at least partially obstruct the field of view of said second antenna assembly; said first transmission network is substantially transparent to radiation in said second frequency band ν2 and comprises a primary feed line, a plurality of secondary feed lines, and a plurality of couplers; said secondary feed lines are connected to individual ones of said antenna elements; said secondary feed lines are coupled to said primary feed line via said couplers; and said couplers are electrically connected in series along said primary feed line.