Enhancing the bandwidth and output power of Tonpilz underwater acoustic transducers is critical for improving sonar detection performance. Constrained by limited space in underwater platforms, conventional methods—such as adjusting transducer dimensions or adding acoustic matching layers—are impractical for boosting power output and broadening operational bandwidth. This study therefore proposes a novel radiating head structure design combined with wideband impedance matching. Parameter optimization of the structure was conducted via finite element analysis. Subsequently, an active power calculation model incorporating residual vibration damping resistors was established by extending the conventional Krimholtz-Leedom-Matthaei (KLM) equivalent circuit model with an impedance matching network. Finally, component parameters of the network were calculated using an adaptive Gauss-Newton algorithm, with the objective of minimizing the average impedance across the target frequency band. Experimental results demonstrate that, compared to traditional transducers, the proposed design achieves a 4~13 dB increase in transmitting voltage response (TVR) within the operational bandwidth, triples the active power output, broadens the bandwidth by 1.5 times, and reduces residual vibration interference in excitation signals by 90%. These improvements significantly enhance the acoustic radiation characteristics of Tonpilz transducers, providing a solid foundation for advancing the performance of domestically produced underwater acoustic detection equipment.