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New low-loss SAW filter using internal floating electrode reflection types of single-phase unidirectional transducer

New low-loss SAW filter using internal floating electrode reflection types of single-phase unidirectional transducer

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A new single-phase unidirectional transducer utilising the difference between excitation and reflection positions caused by the floating electrodes of open and short metal strips inserted into the interdigital transducer within a half wavelength is described.

References

    1. 1)
      • Rosenfeld, R.C., Brown, R.B., Hartmann, C.S.: `Unidirectional acoustic surface wave filter with 2 dB insertion loss', Proceedings of the IEEE ultrasonics symposium, 1972, p. 40–45.
    2. 2)
      • Yamanouchi, K., Nyfeller, F., Shibayama, K.: `Low insertion loss acoustic surface wave filter using group-type unidirectional interdigital transducer', Proceedings of the IEEE ultrasonics symposium, 1975, p. 317–321.
    3. 3)
      • 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 the IEEE ultrasonics symposium, 1982, p. 40–45.
    4. 4)
      • M.F. Lewis . Group-type unidirectional SAW devices employing intra-transducer reflector banks. Electron. Lett. , 1085 - 1087
    5. 5)
      • G.L. Matthaei , F. Barman , E.B. Savage . SAW reflecting arrays. Electron. Lett. , 556 - 557
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