Patent ID: 7068218

Claim:
An antenna array comprising: at least one feed connection; a reflector; plural antenna elements arranged in plural columns in front of the reflector, the plural columns having inputs; a beam forming network being connected between the feed connection and the column inputs for N antenna elements arranged in a respective column, N being a natural number; a calibration device comprising no more than N/2 coupling devices for said N antenna elements, said N/2 coupling devices being associated with only some of said N antenna elements, said coupling devices receiving a small amount of signal received or transmitted by the antenna array for use in antenna array calibration; and a combination network connected to the N/2 coupling devices, the combination network being designed such that the electrical delay from the input of the respective column to the output of the combination network is of approximately the same value for all the antenna inputs for a single-polarized antenna array or for at least one polarization for a dual-polarized antenna array, over the entire operating frequency band of the antenna array.