ACOUSTIC SURFACE WAVE COUPLING ACROSS AN AIR GAP
- 15 February 1969
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 14 (4), 122-124
- https://doi.org/10.1063/1.1652741
Abstract
Transfer of acoustic surface waves between two noncontacting surfaces by means of passive, co‐directional piezoelectric coupling is achieved in LiNbO3. Minimum coupling loss is less than 3 dB. When the surfaces are maintained parallel, periodic variation of insertion loss with coupling length is observed. Measurements are in close agreement with predictions using coupled mode theory. A 100‐MHz delay line with a mechanically variable, nondispersive differential delay of 6.1 μsec and a total insertion loss less than 17 dB which utilizes this coupling mechanism is reported.Keywords
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