The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 2025
Filed:
Dec. 27, 2021
Aac Technologies (Nanjing) Co., Ltd., Nanjing, CN;
Shuai Yang, Shenzhen, CN;
Ke Wu, Shenzhen, CN;
Lirong Zhang, Shenzhen, CN;
Zhiqiang Zhuang, Shenzhen, CN;
Chao Wang, Shenzhen, CN;
AAC Technologies (Nanjing) Co., Ltd., Nanjing, CN;
Abstract
The present disclosure provides a piezoelectric resonator comprising a substrate having an acoustic reflection mirror, a bottom electrode stacked on the substrate, a piezoelectric layer disposed on the substrate and covering the bottom electrode, and a top electrode stacked on a surface of piezoelectric layer distal to the bottom electrode. An overlapping portion of the acoustic reflection mirror, the bottom electrode, the piezoelectric layer, and the top electrode along a thickness direction of the piezoelectric resonator is a resonance region. A sidewall of the top electrode or a bottom electrode recesses to form a recessing portion. The recessing portion does not extend to an upper surface or a lower surface of the top electrode or the bottom electrode.