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Tonpilz design of transducers has been widely used for underwater applications due to their low cost, simplicity in fabrication and good acoustic performance like radiation of high power ultrasonic waves apart from their high sensitivities. But in recent years, there have been requirements for wide-band signals in different fields of underwater acoustic technology. In the transducer high sensitivity and high bandwidth are very much essential, but do not normally go hand-in-hand and require a significant trade-off between the two. In this paper different designs are discussed in detail to enhance the bandwidth of the conventional tonpilz piezoelectric transducers with a minimal effect on acoustic sensitivity without using any exotic transduction material. The most important parameter that affects significantly the bandwidth of the tonpilz transducer is the mechanical quality factor of the device. This is directly proportional to effective mass and inversely proportional to radiation resistance. But, for a given frequency, the radiation resistance is fixed and the only parameter that can be tweaked is effective mass. This paper describes how to make radiating head mass as lighter as possible, which in turn make the effective mass lighter and increases the bandwidth. This paper also presents detail analysis, optimisation and fabrication details of the design.
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