Patent ID: 11929730
Assignee: EPISTAR CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An acoustic wave element, comprising:
a substrate;
a bonding structure on the substrate;
a support layer on the bonding structure;
a first electrode comprising a lower surface on the support layer,
a cavity positioned between the support layer and the first electrode and exposing the lower surface of the first electrode;
a piezoelectric layer on the first electrode; and
a second electrode on the piezoelectric layer;
wherein at least one of the first electrode and the second electrode comprises a first layer and a second layer that the first layer has a first acoustic impedance and a first electrical impedance, the second layer has a second acoustic impedance and a second electrical impedance, wherein the first acoustic impedance is higher than the second acoustic impedance and the second electrical impedance is lower than the first electrical impedance.