应用证实了线缆对高频压电元件的阻抗性能有显著影响。目前压电换能器分析理论仅考虑换能器本身的电性能参数，未考虑线缆参数对高频压电换能器阻抗特性的影响。为了解决该问题，本文在 1-3 型压电复合材料换能器振动模型基础上，建立了包含线缆电参数的高频 1-3 型压电复合材料换能器的阻抗分析模型，推导理论计算公式。为验证模型的准确性，选取 0. 7 m 的 RG174 同轴线缆连接到 5 MHz 的 1-3 型压电复合材料换能器上，测量其阻抗曲线并与理论值进行对比。实验结果表明，建立的线缆参数对高频 1-3 型压电换能器阻抗特性影响分析模型与实测值具有良好一致性，其谐振频率误差＜2. 5%，反谐振频率误差＜0. 5%，证实该模型能准确预测连接线缆后的高频换能器的频率偏移。该研究可为高频 1-3 型压电复合材料换能器的性能优化、阻抗匹配与系统设计提供参考。

Applications have demonstrated that cables have a significant impact on the impedance characteristics of high-frequency piezoelectric elements. Current analytical theories for piezoelectric transducers consider only the electrical parameters of the transducer itself， without accounting for the influence of cable parameters on the impedance characteristics of high-frequency piezoelectric transducers. To address this issue， an impedance analysis model for high-frequency 1-3 piezoelectric composite transducers was established that incorporates cable electrical parameters， based on the vibration model of 1-3 piezoelectric composite transducers， and theoretical calculation formulas were derived. To verify the accuracy of the model， a 0. 7 m RG174 coaxial cable was connected to a 5 MHz 1-3 piezoelectric composite transducer， and its impedance curve was measured and compared with theoretical values. Experimental results show that the proposed model for analyzing the influence of cable parameters on the impedance characteristics of high-frequency 1-3 piezoelectric transducers agrees well with measured values， with a resonant frequency error of less than 2. 5% and an anti-resonant frequency error of less than 0. 5%. This confirms that the model can accurately predict the frequency shift of high-frequency transducers after cable connection. The findings of this study provide valuable references for performance optimization， impedance matching， and system design of highfrequency 1-3 piezoelectric composite transducers.

TN384

重庆市教育委员会科学技术研究项目（KJZD-M202300404）；重庆市自然科学基金项目资助（No. CSTB2024NSCQLZX0050）