Stacked bulk acoustic resonator band-pass filter with controllable pass bandwidth
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United States of America Patent
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Sep 16, 2008
Grant Date -
Jun 1, 2006
app pub date -
Jan 12, 2006
filing date -
Oct 30, 2003
priority date (Note) -
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Abstract
The band-pass filter has a stacked pair of film bulk acoustic resonators (FBARs) and an acoustic decoupler between the FBARs. Each of the FBARs has opposed planar electrodes and a layer of piezoelectric material between the electrodes. The acoustic decoupler controls the coupling of acoustic energy between the FBARs. Specifically, the acoustic decoupler couples less acoustic energy between the FBARs than would be coupled by direct contact between the FBARs. The reduced acoustic coupling gives the band-pass filter desirable in-band and out-of-band properties.
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