Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-09-20
2005-09-20
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S192000, C310S322000, C310S335000
Reexamination Certificate
active
06946928
ABSTRACT:
The acoustically-coupled transformer includes first and second stacked bulk acoustic resonators (SBARs), each having a stacked pair of film bulk acoustic resonators (FBARs) with an acoustic decoupler between them. In one embodiment, the acoustic decoupler comprises a layer of decoupling material has having a nominal thickness equal to an odd integral multiple of one quarter of the wavelength of an acoustic wave having a frequency equal to the transformer's center frequency. In another embodiment, the acoustic decoupler comprises a Bragg stack. Each FBAR has opposed planar electrodes with piezoelectric material between them. The transformer additionally has first terminals, second terminals, a first electrical circuit connecting one FBARs of the first SBAR to one FBAR of the second SBAR and the first terminals, and a second electrical circuit connecting the other FBAR of the first SBAR to the other FBAR of the second SBAR and the second terminals.
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B. Hadimioglu et al., “Polymer Films As Acoustic Matching Layers”, 1990 IEEE Ultrasonics Symposium Proceedings, vol. 3, pp. 1337-1340, Dec., 1990.
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Larson, III John D.
Ruby Richard C.
Hardcastle Ian
Summons Barbara
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