Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2009-03-13
2011-12-20
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S188000, C333S189000, C333S190000, C029S02600B, C029S594000, C348S731000, C334S041000
Reexamination Certificate
active
08081049
ABSTRACT:
A band-pass filter device includes: a plurality of band-pass filter elements on a principal plane of a substrate; wherein the band-pass filter elements correspond to a plurality of respective channels divided by frequency regions, and each have a plurality of piezoelectric resonators. Each of the piezoelectric resonators includes a piezoelectric film whose periphery is supported by the substrate, a first electrode formed on a lower surface of the piezoelectric film, a second electrode formed on an upper surface of the piezoelectric film and formed in a state of overlapping at least a part of the first electrode with the piezoelectric film interposed between the second electrode and the first electrode, a lower space formed between the substrate and the piezoelectric film, and an upper space formed over the piezoelectric film.
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K&L Gates LLP
Sony Corporation
Summons Barbara
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