Accession Number : ADD008475
Title : Beamforming Utilizing a Surface Acoustic Wave Device.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Jelks,Edward C
Report Date : 13 Jan 1981
Pagination or Media Count : 7
Abstract : A beamforming apparatus is provided for processing the outputs of a linear array of spaced apart receiving elements. The beamforming apparatus includes a surface acoustic wave device which has a pair of transducers mounted on a substrate in a spaced apart relationship. Each transducer is capable of receiving and converting an electrical chirp signal in an acoustic signal for propagation across the surface of the surface acoustical wave device. A plurality of taps are mounted on the substrate in a spaced apart relationship between the pair of transducers for receiving, sharing and converting the acoustic signals back into electric signals. Each tap is adapted to receive a bias voltage. A device is provided for mixing the signal from each tap with a signal from a respective receiving element so as to produce a plurality of mixed output signals, and another device is provided for summing the mixed output signals so as to provide a summed output signal. The summed output signal may then be processed by an upper sideband filter for controlling an indicating device. With this arrangement the beamforming is independent of the center frequency of the array from about 5 KHZ up to the millimeter frequency range.
Descriptors : *Patents, *Electroacoustic transducers, *Beam forming, Acoustic signals, Surface waves, Acoustic waves, Taps, Voltage, Signal processing, Phase shift circuits, Acoustic arrays
Subject Categories : Line, Surface and Bulk Acoustic Wave Devices
Acoustic Detection and Detectors
Distribution Statement : APPROVED FOR PUBLIC RELEASE