中文摘要：

水声换能器的宽带匹配网络设计是宽带声纳发射系统的关键技术之一，良好的匹配网络可以有效地减少功放的能量损失，扩展换能器工作频带，改善发射波形失真度。由于传统的宽带匹配网络设计需要较复杂的解析理论，并需要对换能器的等效电路进行有效分析，因而采用基于计算机辅助设计（CAD）的实频数据技术对多谐振模态水声换能器的宽带匹配网络进行设计。对实频数据技术中的简化实频数据技术（SRFT）进行分析讨论，仿真分析了宽带匹配网络与传统窄带匹配的功率传输增益（TPG），完成耐压圆管水声换能器的宽带匹配网络设计，并在消声水池进行了匹配效果试验。试验结果表明：采用简化实频数据技术设计出的宽带匹配网络在兼顾工作带宽的同时能有效改善系统发射效率。在同等测试条件下，相比较无匹配的发射系统，宽带匹配系统声源级提高了10 dB以上；相比传统窄带匹配发射系统，换能器工作带宽扩展了约64%。整个宽带匹配网络的设计过程全部采用计算机辅助完成且无需获得换能器的等效电路，具有一定的工程实用价值。

英文摘要：

The broadband matching network design of underwater acoustic transducer is one of the key technologies for broadband sonar system which can effectively reduce the power loss,expand the working bandwidth of the transducer and improve the distortion of the transmitted waveform.In this paper,a broadband matching network design for multi-resonant mode transducer with the real frequency method was proposed.For underwater acoustic pi-ezoelectric ceramic transducer,the impedance varies with the frequency which is difficult to be expressed by the analytical function.Therefore,it is difficult to achieve good broadband matching performance in a wide frequency range.The traditional broadband matching technology lies on complex analytical theory and analyzes the equivalent circuit of the transducer.In fact,the single inductor matching and multi-resonance method are often used fornbsp;underwater acoustic transducer broadband matching design,however,the actual matching effect cannot achieve the desired.In the radio field,the theory and method of broadband matching has been well developed,combined with computer aided design（CAD）technology,a series of broadband matching numerical methods applied in the antenna broadband and microwave amplifier matching.The design process was accomplished with computer aided and without equivalent circuit of the load.Taking this advantage,the real frequency direct computational technique is utilized for broadband matching network of underwater acoustic transducer.Firstly,the matching principle of the transducer was briefly discussed,and the theory of Simplified Real Frequency Technique（SRFT）was also discussed. Secondly,the matching network of the pressure pipe transducer was designed.The nonlinear least squares algorithm was used to optimize the transducer power gain（TPG）,with the continued fraction expansion method to synthesize wideband matching network.Finally,the matching performance was tested in anechoic pool.The results show that the broadband matching network can improve the t