A phase array acoustic device using array of horns and optional faceplates is presented. Said horn phased-array acoustic device can be used as a passive sensor, a sound projector, or both (sonar).
It is shown that by correct selection of the fill-factor and apodization faceplate, grating-lobes and side-lobes cab be greatly reduced.
An optional use of acoustic valves as phase-shifter in the wave domain to improve Signal to Noise Ratio is presented.
An optional aperiodic tiling of the horns' mouth to reduces aliasing is presented.