| 摘要 |
<p>A surface acoustic wave device consists of a substrate of a piezo-electric material provided with an input transducer T min I and ten output transducers T min 01 .... T min 010 spaced apart along the substrate. The output transducers are arranged in two tracks (20,30) and are spaced apart so that a surface acoustic wave, launched in a propogation direction P and received at the output transducers will be subject to respective delays. These delays exclude one or more delays which would have arisen if the output transducers had been arranged on the substrate with the same relative spacings but in a single track only.</p> |
