Rectilinear phased array transducer using 2-2 ceramic-polymer composite

When a dynamic focus is desired in two spatial dimensions, it is convenient to form the array from elements of different shapes or radiating areas. It is then usually more difficult to achieve uniform acoustic response from the various elements. It is shown that a 2-2 composite, polymer and ceramic plates stacked on an axis normal to both the transducer face and the phased array steering direction, provides many of the desirable properties of 1-3 composites for a rectilinear phased array without the need for additional segmentation of the element width. The saw kerf provides excellent mechanical isolation between elements in the steering direction, thus suppressing lateral coupling. For fine enough stacking pitch, the element response is relatively independent of the element dimensions in the stacking direction