Acoustic wave device
AssigneeMurata Manufacturing Co., Ltd.
InventorAkira NOGUCHI
Life of this patent
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Abstract
An acoustic wave filter includes a longitudinally coupled resonator that includes a multilayer substrate and IDT electrodes. The multilayer substrate includes a piezoelectric layer including main surfaces opposite to each other and a metal layer coupled with one of the main surfaces of the piezoelectric layer. The IDT electrodes are located at one of the main surfaces. Each of the IDT electrodes includes electrode fingers parallel or substantially parallel to each other. In plan view of the main surfaces, the metal layer extends across adjacent ones of the electrode fingers included in one of the IDT electrodes.
Claims20
An acoustic wave device, comprising:
- a longitudinally coupled resonator including a piezoelectric substrate and a plurality of interdigital transducer (IDT) electrodes;
- wherein
- the piezoelectric substrate includes:
- a piezoelectric layer including a first main surface and a second main surface opposite each other, the plurality of IDT electrodes being located at the first main surface;
- and
- a metal layer coupled with the second main surface of the piezoelectric layer;
- each of the plurality of IDT electrodes includes a plurality of electrode fingers parallel or substantially parallel to each other;
- and
- in plan view of the first main surface and the second main surface, the metal layer extends across adjacent ones of the plurality of electrode fingers included in one of the plurality of IDT electrodes.
Dependencies are inferred from the claim text.