Segmented structure, in particular for a satellite antenna reflector, said segmented structure comprising: - at least two panels (2, 3, 4), intended to be deployed in space, a first panel referred to as the main panel, comprising a front face and a rear face, and a second panel (3, 4) referred to as the secondary panel, also comprising a front face (3A, 4A) and a rear face (3B, 4B); and - at least one deployment device which is connected to the respective rear faces of said main and secondary panels and is capable of bringing said secondary panel (3, 4) into one or the other of the following two positions, relative to said main panel; • a storage position, in which said secondary panel (3, 4) is positioned at least in part on said main panel on the rear face thereof, the front face (3A, 4A) of said secondary panel (3, 4) being directed in the same direction as the front face of said main panel; and • a deployed position, in which said secondary panel (3, 4) is positioned towards the outside of the main panel, to the side and against said main panel in order to form a continuous assembly at least on the front faces thereof, - said deployment device comprising a rotation system that is capable of causing said translation system and the secondary panel (3, 4) connected to said translation system to rotate relative to said main panel, said rotation system comprising at least one rotation unit capable of generating a rotation between a first structural element rigidly connected to the rear face of the main panel and a second structural element, to which the translation system is connected, characterised in that said deployment device comprises further the translation system comprising at least one translation unit provided with a helical geared motor, said translation system being connected to said secondary panel (3, 4) and being capable of generating a translational movement of said secondary panel (3, 4) relative to said main panel. - at least two panels (2, 3, 4), intended to be deployed in space, a first panel referred to as the main panel, comprising a front face and a rear face, and a second panel (3, 4) referred to as the secondary panel, also comprising a front face (3A, 4A) and a rear face (3B, 4B); and - at least one deployment device which is connected to the respective rear faces of said main and secondary panels and is capable of bringing said secondary panel (3, 4) into one or the other of the following two positions, relative to said main panel; • a storage position, in which said secondary panel (3, 4) is positioned at least in part on said main panel on the rear face thereof, the front face (3A, 4A) of said secondary panel (3, 4) being directed in the same direction as the front face of said main panel; and • a deployed position, in which said secondary panel (3, 4) is positioned towards the outside of the main panel, to the side and against said main panel in order to form a continuous assembly at least on the front faces thereof, • a storage position, in which said secondary panel (3, 4) is positioned at least in part on said main panel on the rear face thereof, the front face (3A, 4A) of said secondary panel (3, 4) being directed in the same direction as the front face of said main panel; and • a deployed position, in which said secondary panel (3, 4) is positioned towards the outside of the main panel, to the side and against said main panel in order to form a continuous assembly at least on the front faces thereof, - said deployment device comprising a rotation system that is capable of causing said translation system and the secondary panel (3, 4) connected to said translation system to rotate relative to said main panel, said rotation system comprising at least one rotation unit capable of generating a rotation between a first structural element rigidly connected to the rear face of the main panel and a second structural element, to which the translation system is connected,