Angle of arrival processor using bulk acoustic waves

Abstract

A bulk acoustic wave angle-of-arrival processor in which a bulk acoustic body having the property of conducting bulk acoustic wave beams has formed and defined thereon at acoustically reflecting and focusing surface, the acoustically reflecting surfaces including a portion of one concave inward surface, positioned to receive acoustic beams launched from an input transducer. The body has at least one output transducer set, and each has a plurality of juxtaposed directed finger-electrodes aligned in a row perpendicular to the long direction of the electrodes, and positioned to receive steered beams from at least one of the reflecting surfaces. An input transducer set is positioned upon one surface of the body to steer beams into the body toward at least one of the reflecting and focusing surfaces. The input transducer set has individual electrodes on its outer surface which are positioned and spaced to the same pattern as the respective antennas to which they are attached. Between each electrode of the input set and the bulk acoustic wave body is a piezoelectric transducer. The transducer electrodes have spacings, that are proportional to the corresponding spacings, that are the same as the spacing of the antennas to which they are attached.