Patent ID: 11923820
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. An acoustic wave device comprising:
a support substrate;
a piezoelectric layer provided directly or indirectly on the support substrate; and
an IDT electrode including a plurality of electrode fingers and provided on a main surface of the piezoelectric layer; wherein
a thickness of the piezoelectric layer is about 1λ or less when a wavelength of an acoustic wave determined by an electrode finger period of the IDT electrode is defined as λ;
the support substrate is an A-plane sapphire substrate; and
Euler angles of the support substrate are an orientation determined by (about 90°±5°, about 90°±5°, ψ), ψ being in a range of about 120° or more and about 165° or less, or Euler angles of the support substrate are an orientation crystallographically equivalent to an orientation determined by (about 90°±5°, about 90°±5°, ψ), ψ being in the range of about 120° or more and about 165° or less.