Low-loss SAW filter using internal reflection types of single-phase unidirectional transducer

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Low-loss SAW filter using internal reflection types of single-phase unidirectional transducer

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© The Institution of Electrical Engineers
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A new single-phase unidirectional transducer utilising the difference between excitation and reflection positions caused by the change of the electromechanical coupling coefficient within a half or one wavelength is described.

Inspec keywords: surface acoustic wave devices; ultrasonic transducers; crystal filters

Other keywords: low loss; reflection positions; excitation position; single-phase unidirectional transducer; SAW filter; electromechanical coupling coefficient; US transducer; internal reflection types

Subjects: Sonic and ultrasonic transducers and sensors; Acoustic wave devices

References

    1. 1)
      • M.F. Lewis . Group-type unidirectional SAW devices employing intra-transducer reflector banks. Electron. Lett. , 1085 - 1087
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      • R.S. Wagers . Analysis of thin-film-dielectric decoupling of inter-digital transducers. Electron. Lett. , 302 - 304
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      • Rosenfeld, R.C., Brown, R.B., Hartmann, C.S.: `Unidirectional acoustic surface wave filter with 2 dB insertion loss', Proceedings of 1972 IEEE ultrasonics symposium, p. 40–45.
    4. 4)
      • Yamanouchi, K., Nyfeller, F., Shibayama, K.: `Low insertion loss acoustic surface wave filter using group-type unidirectional interdigital transducer', Proceedings of 1975 IEEE ultrasonics symposium, p. 317–321.
    5. 5)
      • Hartmann, C.S., Wright, P.V., Kansy, R.J., Garber, E.M.: `Analysis of SAW interdigital transducers with internal reflections and the application to the design of single-phase unidirectional transducers', Proceedings of 1982 IEEE ultrasonics symposium, p. 40–45.
    6. 6)
      • M. Hirabayashi , Y. Komatsu , M. Kanamaru . Electromechanical coupling constants of surface acoustic waves on lithium niobate covered with silicon dioxide. Jpn. J. Appl. Phys. , 1366 - 1367
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