Patent ID: 11942918
Assignee: SHENZHEN NEWSONIC TECHNOLOGIES CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A surface acoustic wave (SAW) device, comprising:
a substrate;
an interdigital transducer (IDT) having lead-out portions and arrays of interdigital electrodes formed on the substrate, wherein the interdigital electrodes include central portions, end portions, and intermediate portions between the end portions and the lead-out portions, and a thickness of the interdigital electrodes at the end portions is greater than a thickness of the interdigital electrodes at the central portions and the intermediate portions, thereby forming protruding structures at the end portions of the interdigital electrodes;
a protective layer formed on the protruding structures at the end portions of the interdigital electrodes;
a first temperature compensation layer formed on the protective layer;
a second temperature compensation layer formed on the first temperature compensation layer and on the central portions and the intermediate portions of the interdigital electrodes; and
a passivation layer formed on the second temperature compensation layer,
wherein the protective layer, the first temperature compensation layer, and the second temperature compensation layer are formed between the passivation layer and the end portions of the interdigital electrodes, and
only the second temperature compensation layer is formed between the passivation layer and the central portions and the intermediate portions of the interdigital electrodes.