Patent ID: 8731483

Claim:
A method for an antenna system comprising a transmitting phase array antenna comprising a transmitting antenna subarray comprising a number Q antenna elements transmitting on a first frequency and a receiving phase array antenna comprising a receiving antenna subarray comprising a number P antenna elements, the transmitting antenna subarray antenna being positioned at a distance relative the receiving antenna subarray antenna, wherein the transmitting antenna subarray antenna transmits a first signal at a first time period and wherein the receiving antenna subarray antenna receives the first signal at least partly within the first time period causing a coupling between the transmitting antenna subarray antenna and the receiving antenna subarray antenna, the method comprising: deciding the coupling between the antenna elements in the transmitting antenna subarray antenna and the antenna elements in the receiving antenna subarray antenna are in a scattering-matrix S BA , and utilizing the scattering matrix S BA as a constraint in order to modify a quiescent excitation x 0 in the transmitting antenna subarray in order to get nulls at the elements in the receiving antenna subarray by controlling the elements in the transmitting antenna subarray antenna to transmit a signal that nullifies the coupling energy in the receiving antenna subarray antenna.