Acoustic wave device
AssigneeMurata Manufacturing Co., Ltd.
InventorSho Nagatomo
Life of this patent
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Abstract
An acoustic wave device includes first and second acoustic wave resonators, each including a piezoelectric layer and a functional electrode, and an acoustic coupling layer laminated between the piezoelectric layer of each of the first and second acoustic wave resonators. Each of the functional electrodes of the first and second acoustic wave resonators includes at least one pair of electrode fingers. In each of the first and second acoustic wave resonators, when a thickness of the piezoelectric layer is defined as d and a center-to-center distance of the electrode fingers adjacent to each other is defined as p, d/p is about 0.5 or smaller. The first and second acoustic wave resonators face each other across the acoustic coupling layer.
Claims20
An acoustic wave device comprising:
- a first acoustic wave resonator and a second acoustic wave resonator, each including a piezoelectric layer and a functional electrode on the piezoelectric layer;
- and
- an acoustic coupling layer laminated between the piezoelectric layer of the first acoustic wave resonator and the piezoelectric layer of the second acoustic wave resonator;
- wherein
- each of the functional electrodes of the first acoustic wave resonator and the second acoustic wave resonator includes at least one pair of electrode fingers;
- when in each of the first acoustic wave resonator and the second acoustic wave resonator, a thickness of the piezoelectric layer is defined as d and a center-to-center distance between electrode fingers of the at least one pair of electrode fingers adjacent to each other is defined as p, d/p is about 0.5 or smaller;
- and
- the first acoustic wave resonator and the second acoustic wave resonator face each other across the acoustic coupling layer.
Dependencies are inferred from the claim text.