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中文摘要：
压电超声换能器在不同的工作频率下具有不同的输入阻抗,当驱动信号源输出阻抗与换能器输入阻抗失配时会产生能量损耗,导致无法满足换能器的功率要求,从而使其光谱衍射效率降低,影响光谱成像质量。为此对换能器阻抗频率特性的深入研究,设计了一种新型宽带阻抗匹配网络。通过ADS仿真及匹配电路的测试,最终在115-180 MHz超声波频率内可使换能器的光谱衍射效率最高达70%。
英文摘要：
The piezoelectric ultrasonic transducer has different input impedances at different frequencies. The mismatch between the output impedance of the driving signal source and the input impedance of the transducer will result in energy losses and can＇t meedt the power requirements of the transducer, thus the spectroscopy diffraction efficiency will be reduced and affect the spectral imaging quality. So to do this, the transducer impedance frequency characteristics has been studied deeply and a new broadband impedance matching network was designed. By ADS simulation and experimental testing of matching circuit, Finally, the spectral diffraction efficiency get up to 70% within the 115 - 180 MHz ultrasonic frequency.
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