压电薄膜换能器的电机耦合系数k非常重要,为此,从换能器的应用来决定k值最适用的范围。用于微波声学衰减的测量时,希望k值低,而用于微波声学延迟线和其他类型器件时,要求k值高。对应用于压缩波来说具有最高k值的材料是氧化锌,因此我们选用氧化锌 Piezoelectric film transducer motor coupling coefficient k is very important, therefore, from the application of the transducer to determine the most suitable range of k value. For microwave acoustical attenuation measurements, the k value is expected to be low, and for use with microwave acoustic delay lines and other types of devices, the k value is required to be high. The material with the highest k value for compressional waves is zinc oxide, so we chose zinc oxide