Acoustic bandgap structures adapted to suppress parasitic...

Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor

Reexamination Certificate

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C361S311000

Reexamination Certificate

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07869187

ABSTRACT:
An acoustic bandgap structure can include a stack of at least three ferroelectric layers with a top side and bottom side of each of the ferroelectric layers contacting an electrode layer, where the ferroelectric layers and the electrode layers form a substantially periodic structure in the direction normal to the ferroelectric and electrode layers and where an acoustic characteristic impedance and thickness of each layer are selected to realize an acoustic bandgap over a desired frequency band for the purpose of improving the device Q.

REFERENCES:
patent: 4240003 (1980-12-01), Larson, III
patent: 6437484 (2002-08-01), Nishimura et al.
patent: 2004/0184217 (2004-09-01), List et al.
patent: 2006/0274476 (2006-12-01), Cervin-Lawry et al.
patent: 2008/0253056 (2008-10-01), Leidl et al.
patent: WO 2007031061 (2007-03-01), None

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