Patent ID: 11863155
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A surface acoustic wave element comprising:
a substrate including a LiNbO3 piezoelectric single crystal;
a first dielectric layer provided directly or indirectly on the substrate; and
an IDT electrode provided directly or indirectly on the first dielectric layer; wherein
at least a portion of the first dielectric layer is provided between the IDT electrode and the substrate;
a high-frequency signal is propagated on the substrate using a Rayleigh wave;
the IDT electrode includes first, second, third, fourth, and fifth metal films that are laminated in this order from a side of the substrate;
the first metal film is an adhesion film made of NiCr;
the second metal film is a main electrode made of Pt;
the third metal film is a barrier film to reduce or prevent diffusion between the second metal film and the fourth metal film, and is made of Ti;
the fourth metal film is a conductive film made of an AlCu alloy material; and
the fifth metal film is an adhesion film made of Ti.