Patent ID: 10122475

Abstract:
A system for generating and transmitting ULF/VLF signals comprises a plurality of MEMS transmitter devices arranged in an array. Each transmitter device includes a first ground plane; a beam coupled to the first ground plane by an anchor, such that the beam extends over and is spaced apart from the first ground plane; an electret coupled to the beam and spaced apart from the first ground plane; an electrical bias drive coupled to the beam to generate a stress on the beam; and a second ground plane spaced above the beam. The system also comprises a vibration drive stage operatively coupled to each transmitter device. The vibration drive stage synchronically drives each transmitter device such that each electret vibrates in a substantially perpendicular direction with respect to the first and second ground planes. Each electret also vibrates at substantially the same modulated frequency to generate and transmit ULF/VLF signals.