Patent ID: 7855690

Claim:
An array antenna comprising: a region of reference potential and a spatially extended collection of at least two antenna elements capable of being at least partly balanced driven and at least partly unbalanced driven, wherein said antenna elements further comprise: a first radiating element coupled to a first port, and a second radiating element coupled to a second port, which radiating elements are arranged substantially adjacent and parallel to each other so as to extend at least a first distance approximately perpendicularly from said region; a radiating arrangement coupled to said first and second radiating elements so as to extend at least a second distance above and approximately parallel to said region, wherein the first and second ports of each antenna element are coupled to a feeding arrangement wherein the feeding arrangement is arranged to vary the phase difference φ between a first signal communicated between the first port and the feeding arrangement and a second signal communicated between the second port and the feeding arrangement and further wherein the feeding arrangement further comprises a device arranged so that a signal (IQ) communicated with a first terminal of the device is divided with a first substantially fixed phase difference φ-j between said first signal and said second signal and a signal communicated with a second terminal of the device is divided with a second substantially fixed phase difference between said first signal and said second signal.