Patent ID: 7245269

Claim:
A method of beam steering comprising: a. arranging an antenna so that the antenna radiates a tunable impedance surface with RF radiation, the tunable impedance surface having a plurality of tunable resonator cells, each resonator cell being tunable by at least one tuning element associated therewith; b. applying an initial set of control signals to the tuning elements associated with the tunable impedance surface group by group; c. adjusting the coritrol signal up and down by an incremental amount v for a selected group; d. transmitting and/or receiving an RE signal which is reflected from the tunable impedance surface and measuring a parameter associated with power of the transmitted and/or received RE signal for three cases of −v, 0, and +v adjustments of the control signal for said selected group; e. noting a best value of the control signal for the three cases and setting the control signal accordingly for said selected group and adjusting the control signal up and down by said incremental amount v for another selected group; f. repeating steps d and e to adjust the tuning elements for said another selected group until all the tuning elements have been adjusted; and g. repeating steps c–f to adjust the tuning elements for a period of time.