Martins, M. S.Barardo, C.Matos, T.Gonçalves, L. M.Cabral, J.Silva, AntónioJesus, Sergio2019-11-202019-11-202017978-1-5090-5278-30197-7385http://hdl.handle.net/10400.1/13279This work describes the development and characterization of a wide beam and wideband ultrasonic transducer, designed as an emitter for underwater communications up to 1.5 MHz. The active element being used is composed of two layers of 110 mu m PVDF (Polyvinylidene fluoride) film, with NiCu electrodes. The transducer has a semicircular shape with a diameter of 15 cm. Pool trials show a transmitting voltage response of approximately 150 dB re mu Pa/V @ 1m from 750kHz to 1MHz and higher than 130 dB re mu Pa/V @ 1m between 250kHz and 1.5MHz. At 1 MHz, when excited with 12V, the transducer has a power consumption of 37.5 mW.engEmitter transducersconference object