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滤波器由短的压电材料组成,其一侧上有发射电极阵,另一侧有接收电极阵。滤波器频率由极间距离控制。当相反极性的电极间距离等于1/2波长时,发生最大的声能。Mullard研究所在物理学展览会上展出
The filter consists of a short piezoelectric material with a transmitting electrode array on one side and a receiving electrode array on the other side. The filter frequency is controlled by the distance between poles. The maximum acoustic energy occurs when the distance between electrodes of opposite polarity is equal to ½ wavelength. Mullard Institute exhibited at the Physics Exhibition