| 摘要 |
The method involves providing an acoustic wave propagating substrate having an effective coupling coefficient k2, disposing a first electro-acoustic transducer on the acoustic wave propagating substrate, and disposing a first acousto-electric transducer having a length M1 on the acoustic wave propagating substrate, the first acousto-electric transducer having N1 many electrode pairs in it. N1>=C/k2, C being a constant having a value in the range from 1 to 2. The first acousto-electric transducer is acoustically coupled to the first electro-acoustic transducer. The method further involves disposing a second acousto-electric transducer on the acoustic wave propagating substrate, and disposing a second electro-acoustic transducer having a length M2 on the acoustic wave propagating substrate, in which M2 is more than M1. The second electro-acoustic transducer is electrically coupled and conjugately impedance matched to the first acousto-electric transducer. The second electro-acoustic transducer has N2 many electrode pairs in it, wherein N2N1. The second electro-acoustic transducer is acoustically coupled to the second acousto-electric transducer. |
