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. 29, 2025
Filed:
Dec. 21, 2021
Murata Manufacturing Co., Ltd., Nagaokakyo, JP;
Masakazu Mimura, Nagaokakyo, JP;
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Abstract
A surface acoustic wave device includes a piezoelectric substrate made of θ° rotated Y-cut X-propagation LiNbOhaving a cut angle θ, an IDT electrode on the piezoelectric substrate and including a plurality of electrode fingers, and a dielectric film on the piezoelectric substrate and covering the IDT electrode. The IDT electrode includes a main electrode layer and an auxiliary conductive layer. The main electrode layer is, compared to the auxiliary conductive layer, closer to a side of the piezoelectric substrate. The main electrode layer includes Pt as a main component. Where the film thickness of the main electrode layer is denoted as h, the film thickness of the dielectric film is denoted as H, and a wavelength determined by the electrode finger pitch of the IDT electrode is denoted as λ, the relationship in Formula (1) and Equation (2A) to Equation (2D) is satisfied.