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Tapered transmission line technique based graded matching layers for thickness mode piezoelectric transducers

机译:基于锥形传输线技术的厚度模式压电换能器的渐变匹配层

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摘要

Conventionally, in order to acoustically match thickness mode piezoelectric transducers to a low acoustic impedance load medium, multiple quarter wavelength (QW) matching layers are employed at the front face of the device. Typically a number of layers, 2-4 in number, are employed resulting in discrete impedance steps within the acoustic matching scheme. This can result in impedance matching with limited bandwidth characteristics. This paper investigates the application of tapered transmission line filter theory to implement a graded impedance profile, through the thickness of the matching layer scheme, to solve the impedance mismatch problem whilst accounting for enhanced transducer sensitivity and bandwidth.
机译:常规地,为了使厚度模式压电换能器与低声阻抗负载介质声学匹配,在设备的正面采用了四分之一波长(QW)匹配层。通常,使用数量为2-4的多个层,从而在声学匹配方案内导致离散的阻抗阶跃。这会导致阻抗匹配具有有限的带宽特性。本文研究了锥形传输线滤波器理论在通过匹配层方案的厚度来实现分级阻抗曲线的应用中的应用,以解决阻抗不匹配问题,同时考虑了换能器灵敏度和带宽的提高。

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