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Suppression of bulk modes in SAW transversal filters by gold transducers

Suppression of bulk modes in SAW transversal filters by gold transducers

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Unwanted bulk modes in surface-acoustic-wave (SAW) transversal filters are demonstrated to be dependent on the transducer metallisation. Experimental results are presented that compare Au with the more conventional Al metallisation and show that bulk modes can be suppressed by > 20 dB.

References

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      • T.I. Browning , M.F. Lewis . New family of bulk-acoustic-wave devices employing interdigital transducers. Electron. Lett. , 128 - 130
    2. 2)
      • F.G. Marshal , C.O. Newton , E.G.S. Page . Surface acoustic wave multistrip components and their application. IEEE Trans. , 216 - 225
    3. 3)
      • Nishikawa, T., Tani, A., Shirai, K., Takeuchi, C.: `SH-type surface acoustic waves on rotated Y-cut quartz', Proc. 34th Ann Freg Control Symposium, May 1980, USA ERADCOM Ft. Monmouth, NJ, p. 286–291.
    4. 4)
      • D.L. Lee . Analysis of energy trapping effects for SH-type waves on rotated Y-cut quartz. IEEE Trans. , 330 - 341
    5. 5)
      • Langecker, K., Veith, R.: `Automatic time domain testing of SAW devices', Proc. IEEE Ultrasonics Symposium, 1980, p. 396–399.
    6. 6)
      • Shimizu, Y., Terazaki, A., Sakawe, T.: `Temperature dependence of SAW velocity for metal film on alpha-quartz', Proc. IEEE Ultrasonic Symposium, 1976, p. 519–522.
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