Title: Apparatus and method for phase-encoded surface wave devices

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Abstract: Apparatus and method for phase-encoding electro-acoustic electro-acoustic elements, elements of an acoustic surface wave device to provide preselected transducer characteristics. By altering the position of a transducer element or portions of a transducer element, the phase of the acoustic wave propagated from, or the phase of the electrical signal received by the transducer element can be varied by an amount determined by the velocity of propagation of the acoustic wave. By altering the location of the electro-elements, or portions thereof, from a position determined for example by amplitude-encoding techniques, a resultant signal produced by a plurality of electro-acoustic elements, element portions, or combination of elements and element portions can provide the preselected transducer characteristics. In addition, the elements or element portions can be located such that the overlap amplitude between adjacent electro-acoustic elements is substantially a constant, providing increased directionality for acoustic waves orignating at the transducer. According to one embodiment, each electro-acoustic transducer can be phase-encoded permitting both an input and an output transducer to be phase-encoded with preselected characteristics. According to a second embodiment, the elements or portions thereof of a first transducer are displaced relative to elements or portions thereof of a second transducer to provide appropriate device phase-encoding.


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