ABSTRACT The bandwidth of composite transducer was successfully expanded via matching layer design. Firstly, the admittance equation of transducer was deduced through combining the equivalent model of 1–3 piezoelectric composite with the electromechanical equivalent circuit of piezoelectric crystal thickness vibration. Then, the relations between bandwidth and the parameters of matching layer were summarized by the conductance curves. Finally, a composite transducer with matching layer was designed and fabricated. Experimental results show that the bandwidth reaches to 56 kHz and the mechanical quality factor Q drops to 1.8. The results are in agreement with the theoretical calculation.

中文翻译：

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通过匹配层设计扩展复合换能器的带宽

摘要 通过匹配层设计，成功扩展了复合换能器的带宽。首先，将1-3压电复合材料的等效模型与压电晶体厚度振动的机电等效电路相结合，推导出换能器的导纳方程。然后，通过电导曲线总结了带宽与匹配层参数之间的关系。最后，设计并制作了具有匹配层的复合换能器。实验结果表明，带宽达到56 kHz，机械品质因数Q下降到1.8。结果与理论计算一致。