Piezoelectric filter, antenna duplexer, and communications...

Details Piezoelectric filter, antenna duplexer, and communications... Piezoelectric filter, antenna duplexer, and communications...

2007-06-14

2009-12-29

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S189000, C310S349000

Reexamination Certificate

active

07639103

ABSTRACT:
A piezoelectric filter comprises a substrate and a plurality of piezoelectric resonators provided on the same substrate. Each piezoelectric resonator comprises a cavity formed in the substrate, a lower electrode formed on the substrate, covering the cavity, a piezoelectric material layer formed on the lower electrode, and an upper electrode formed on the piezoelectric material layer. At least one of the piezoelectric resonators has a cavity formed of a plurality of cells.

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