MEMS acoustic transducer, MEMS microphone, MEMS microspeaker, array of speakers and method for manufacturing an acoustic transducer

A MEMS acoustic transducer, comprising:

• a substrate having a cavity therethrough;
• a conductive back plate unit including a plurality of conductive perforated back plate portions which extend over the substrate cavity;
• dielectric spacers arranged on the back plate unit between adjacent conductive perforated back plate portions;
• and
• one graphene membrane supported by the dielectric spacers and extending over the conductive perforated back plate portion so that the graphene membrane comprises a plurality of deflectable areas extending over the cavity, wherein
• the conductive back plate unit comprises a plurality of adjacent cells, each perforated back plate portion comprising a perforated back plate, ad each cell including one of the perforated back plates;
• the dielectric spacers are arranged on the back plate unit between the adjacent cells;
• the graphene membrane extends over the cells of the back plate unit;
• and
• each of the cells of the back plate unit comprises a hexagonal shaped back plate, wherein the back plate comprises an outer hexagonal shaped frame and an inner hexagonal shaped frame, and wherein the outer frame and the inner frame are connected by a plurality of bars connected with each other at a center of the back plate, each bar extending from the center via one corner of the inner frame to one corner of the outer frame.