| abstract |
The acoustic resonator according to an embodiment of the present invention includes a substrate and a resonator including a central part in which a first electrode, a piezoelectric layer, and a second electrode are sequentially stacked on the substrate, and an extension part disposed along a circumference of the central part. The resonator includes a planar asymmetrical polygonal shape, an insertion layer is disposed below the piezoelectric layer in the extension part, and an upper surface of the piezoelectric layer is raised along the shape of the insertion layer, and the insertion layer is It is formed in an asymmetrical polygonal shape along the shape of the extension. |