Piezoelectric resonator, filter, and electronic...

Details Piezoelectric resonator, filter, and electronic... Piezoelectric resonator, filter, and electronic...

2005-05-03

2005-05-03

Wambley, Patrick (Department: 2819)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C310S320000

Reexamination Certificate

active

06888424

ABSTRACT:
A piezoelectric resonator includes a substrate, a vibration unit disposed on the substrate and having a structure in which at least one pair of an upper electrode and a lower electrode opposed to each other, the upper and lower electrodes sandwiching the upper and lower surfaces of an internal thin-film portion including at least one layer of a piezoelectric thin-film, and an external thin-film portion provided under the lower electrode and including at least one layer of a piezoelectric thin-film or a dielectric thin-film, the vibration unit being vibrated in an n-th harmonic (n is an integer of 2 or more), the upper electrode and the lower electrode being provided substantially in the positions of the loops of the n-th harmonic.

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