Abstract
Arrays having a constant beam-width (in one or more planes) over a wide frequency band have an important application in several branches of acoustical engineering, and particularly in sonar systems. Methods of obtaining this result using linear or planar arrays with electrical networks have been described earlier; the present paper is concerned primarily with methods involving the shaping of the surface of the transducer or array. Particular attention is given to transducers with cylindrical or spherical curvature and to twisted arrays. The results indicate that there is no restriction on the band-width ratio over which a reasonably constant beam-width can be maintained.
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