Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2007-02-06
2007-02-06
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S192000, C333S032000
Reexamination Certificate
active
10965474
ABSTRACT:
The film acoustically-coupled transformer (FACT) has decoupled stacked bulk acoustic resonators (DSBARs), a first electrical circuit and a second electrical circuit. Each of the DSBARs has a lower film bulk acoustic resonator (FBAR), an upper FBAR and an acoustic decoupler. The upper FBAR is stacked on the lower FBAR and the acoustic decoupler is located between the FBARs. Each FBAR has opposed planar electrodes and a piezoelectric element between the electrodes. The first electrical circuit interconnects the lower FBARs. The second electrical circuit interconnects the upper FBARs. The FBARs of one of the DSBARs differ in electrical impedance from the FBARs of another of the DSBARs. The FACT has an impedance transformation ratio greater than 1:m2, where m is the number of DSBARs. The actual impedance transformation ratio depends on the ratio of the impedances of the FBARs.
REFERENCES:
patent: 5587620 (1996-12-01), Ruby et al.
patent: 5864261 (1999-01-01), Weber
patent: 5873154 (1999-02-01), Ylilammi et al.
patent: 6107721 (2000-08-01), Lakin
patent: 6215375 (2001-04-01), Larson, III et al.
patent: 6262637 (2001-07-01), Bradley et al.
patent: 6278342 (2001-08-01), Ella
patent: 6466105 (2002-10-01), Lobl et al.
patent: 6670866 (2003-12-01), Ellaet et al.
patent: 6720844 (2004-04-01), Lakin
patent: 6900705 (2005-05-01), Nakamura et al.
patent: 6946928 (2005-09-01), Larson et al.
patent: 2003/0128081 (2003-07-01), Ella et al.
Lakin, K.M., “Bulk Acoustic Wave Coupled Resonator Filters”, IEEE International Frequency Control Symposium and PDA Exhibition, 2002, pp. 8-14.
Ellis Stephen L.
Larson, III John D.
Sarkeshik Naghmeh
Avago Technologies Wireless IP (Singapore) Pte. Ltd.
Summons Barbara
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