Abstract: An active electronic scan microwave reflector, capable of being illuminated by a microwave source to form an antenna. The reflector includes a set of elementary cells arranged side by side on a surface, each cell including a phase-shifting microwave circuit and a conductor plate arranged substantially parallel to the microwave circuit, the phase-shifting circuit including at least two half-phase-shifters. One half-phase-shifter includes at least a dielectric support, at least two electrically conductive wires substantially parallel to a given direction, arranged on the support and bearing at least a two-state semiconductor element, the conductors being substantially normal to the wires, and two conductor zones arranged towards the periphery of the cell, substantially parallel to the control conductors.