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三次回波效应是SAW器件中特有的一种讨厌现象。抑制三次回波的方法已研究出多种,其中有一种构思巧妙的方法,其原理是设法利用器件中质量/电气加载反射波和压电再生反射波有机掺和以使三次回波自身相消。文献[1、2]就是如此。其中前者是使接收换能器正负极性的指宽以及叉指间隙宽度分别为3/16λo、1/16λo和1/8λo(λo是工作中心频率fo对应的声
Three echo effects are unique to SAW devices. There are many methods for suppressing triple echoes. One of them is a well-conceived method. The principle is to try to make use of organic blending of the mass / electrically-loaded reflected wave and the piezoelectric-regenerated reflected wave in the device to cancel the third-order echoes themselves . The literature [1,2] is the case. The former is to make the receiving transducer positive and negative polarity finger width and interdigital gap width respectively 3 / 16λo, 1 / 16λo and 1 / 8λo (λo is the working center frequency fo corresponding to the sound