A Thickness-Mode High-Frequency Underwater Acoustic Transducer with a Low Sidelobe Level

Thickness vibration mode is commonly used for high-frequency transducers. For disc piezoelectric ceramics, there no ideally pure thickness because the coupling between radial and modes always exists. Furthermore, it also deteriorates transmission voltage response directivity of transducer. In this paper, based on theoretical calculation finite element simulation method, a new method was proposed, related experiment carried out to convince idea. Both analysis experimental results show that drilling hole at center simple but effective obtain ceramic, then improve transmitting ability The sidelobe level as low −21.3 dB.