Patent ID: 7868828

Claim:
An antenna comprising a plurality of radiating elements; a first sub-array defined by a plurality of rows of serially interconnected radiating elements and disposed on a first layer of a substrate, all first sub-array radiating elements connected to a first signal feed port; a second sub-array defined by a plurality of rows of serially interconnected radiating elements and disposed on a second layer of the substrate, all second sub-array radiating elements connected to a second signal feed port; the first and second sub-arrays disposed such that each of the radiating elements in one row of the first sub-array is overlapped with each of the radiating elements in one row of the second sub-array to form a shared row; and a coupler connected to the radiating elements of the shared row for providing signals to the radiating elements of the shared row when a signal is applied to either of the feed ports, respectively.