Recent advancement in electronics technology is helping accelerate the development of new generation of underwater acoustic equipment. The transducer, a sensor of the underwater acoustic equipment, generally has directivity in its beam pattern. Many papers on the improvement of the directivity have so far been presented. However, most of the papers have focused the suppression of the level of sidelobe, and the improvement of the mainlobe has not been presented much.
We have made their effort in the improvement of the mainlobe and have succeed in developing “quasi-ideal beam transducer”. This paper describes the theory of its beam forming and the method of its optimum design. Further, the practical design method and the measurement result of the directivity of the quasi-ideal beam transducer are described.
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