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Improved coupling formula for dual monolithic crystal filters

Improved coupling formula for dual monolithic crystal filters

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In a new approach, based on the fact that resonance frequencies of monolithic crystal filters are obtained as roots of frequency equations, an improved coupling formula is derived.

References

    1. 1)
      • Beaver, W.D.: `Theory and design principles of the monolithic crystal filter', 1967, Ph.D. dissertation, Lehigh University, Bethlehem, Pa..
    2. 2)
      • D.F. Sheahan . An improved resonance equation for AT-cut quartz crystals. Proc. IEEE , 260 - 261
    3. 3)
      • R.A. Sykes , W.L. Smith , W.J. Spencer . Monolithic crystal filters. IEEE International Convention Record
    4. 4)
      • P. Schnabel . Frequency equations for n mechanically coupled piezoelectric resonators. Acustica , 351 - 357
    5. 5)
      • Beck, E., Schultze, E., Meyer, H.: `An admittance approach to the dual monolithic crystal filter', Proceedings of IEEE international symposium on circuits and systems, 1976, p. 316–319.
    6. 6)
      • W.D. Beaver . Analysis of elastically coupled piezoelectric resonators. J. Acoust. Soc. Am. , 972 - 981
    7. 7)
      • Internal report, , available on request from the authors.
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