Design of antenna arrays for near-field focusing requirements using optimisation

An optimisation framework is proposed to properly focus on near-field locations using antenna arrays. This method is able to overcome the traditional problems of near-field focused antennas, obtaining some appropriate weights to be applied at the elements of the array so that the secondary lobes are reduced and the maximum level of the field is placed at the desired point. An illustrative example using simulated antennas is addressed to evaluate the capabilities of this framework.