| 摘要 |
An elastic surface wave transmitting device comprising a piezoelectric substrate S1 on which is arranged a transmitting transducer TE placed on the center of the substrate S1, and two receiving transducers TR1 and TR2 arranged on either side of the transmitting transducer TE, means (a metallic wafer P1, for example deposited by evaporation on to the substrate S1) enabling the waves transmitted by the transmitting transducer TE towards each of the receiving transducers TR1 and TR2 to be phase-shifted so that the waves O1 and O2 respectively reflected by these receiving transducers TR1 and TR2 cancel one another out at the transmitting transducer TE.
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