Monopole Design for Superdirectivity with Pattern Radiation Reconfigurable

This paper presents a global study for superdirectivity of an array of 2 monopoles antennas. It is principally based on Uzkov's theory, who define the possibility to obtain a high directivity in order of N
²
in a desired direction by linearly associating a large number N of radiators closely spaced. A first study is made by exciting monopoles by specific currents excitation in magnitude and phase to obtain a superdirectivity reconfigurable in a desired direction. Secondly, to reduce until eliminate mutual coupling between monopoles, we excite one of monopole by a unit current and loaded the other one by an impedance Z
_load
determined from uzkov's theory. Simulator Ansys HFSS is used to calculated impedance matrix H
_mn
of monopoles antennas array and then currents excitation coefficients a
_0n
used after to determine impedance Z
_load
. Simulations show approximately similar results in the 2 cases with a reconfigurable directivity a least in around of 8.5dB in a desired direction.