Perforated piezoelectric hydrophone, antenna comprising a plurality of hydrophones and method for making said hydrophone

The invention relates to a perforated piezoelectric hydrophone and an antenna comprising a plurality of hydrophones. The hydrophone comprises a stack (10) of layers (1, 2, 3, 4, 5) adhered to one another, the layers (1, 2, 3, 4, 5) comprising at least one piezoelectric layer (2, 4) and a plurality of so-called rigid layers (1, 3, 5), at least two of which are electrode layers, said rigid layers (1, 3, 5) having a stiffness perpendicular to the stacking direction (z), greater than the stiffness of the piezoelectric layer perpendicular to the stacking direction. According to the invention, at least one piezoelectric layer (2, 4) comprises a central area comprising a set of perforations (21) extending through the piezoelectric layer (2, 4) solely in the stacking direction (z), each perforation (21) being sealed by closure elements comprising portions of two of said rigid layers (1, 3, 5), said two rigid layers (1, 3) extending across the entire surface of the central area.