Miniature 90 MHz low-loss narrowband SAW filter using new resonant configuration

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Miniature 90 MHz low-loss narrowband SAW filter using new resonant configuration

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© The Institution of Electrical Engineers
Published

A new low-loss narrowband SAW filter that uses one pair of electrically connected IDTs with an optimum number of fingers, as well as SAW reflectors, is described. A miniature filter with a loss as low as 2 dB and a bandwidth of 0.7% at 90 MHz is presented. The filter is mounted in a TO-8 package and is usable without any outer inductors.

Inspec keywords: passive filters; surface acoustic wave devices; radiofrequency filters

Other keywords: electrically connected IDTs; TO-8 package; 90 MHz; resonant configuration; miniature filter; low-loss narrowband SAW filter; bandwidth; SAW reflectors; interdigital transducers

Subjects: Passive filters and other passive networks; Acoustic wave devices

References

    1. 1)
      • Nakamura, K., Kazumi, M., Shimizu, M.: `SH-type and Rayleigh-type surface wave on rotated Y-cut LiTaO', Proc. IEEE Ultrasonics Symp., 1977, p. 819–822.
    2. 2)
      • Hikita, M., Kinoshita, Y., Kojima, H., Tabuchi, T.: `800 MHz low loss SAW fillers using new phase weighting', IEEE MTT International Microwave Symp. Digest, 1982, p. 46–48.
    3. 3)
      • Hikita, M., Kinoshita, Y., Kojima, H., Tabuchi, T.: `Phase weighting for low loss SAW filters', Proc. IEEE Ultrasonics Symp., 1980, p. 308–312.
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