Patent ID: 11863156
Assignee: SKYWORKS FILTER SOLUTIONS JAPAN CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A surface acoustic wave device comprising:
a substrate;
an interdigital transducer (IDT) electrode disposed on the substrate, the IDT electrode including a lower electrode layer having a lower surface in contact with an upper surface of the substrate and an upper electrode layer having a lower surface defining a base in contact with an upper surface of the lower electrode layer, side surfaces of the lower electrode layer being substantially perpendicular to the upper surface of the substrate, side surfaces of the upper electrode layer being disposed at an acute angle relative to the upper surface of the substrate; and
a layer of dielectric material disposed on the upper surface of the substrate and the IDT electrode, the layer of dielectric material including an upper surface having projections disposed over fingers of the IDT electrode, a largest angle among angles formed by upper surfaces of the projections being smaller than the acute angle.