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. 03, 2018
Filed:
Sep. 15, 2016
Murata Manufacturing Co., Ltd., Nagaokakyo-shi, Kyoto-fu, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A SAW filter device defines a filter including a high acoustic velocity member, a low acoustic velocity film, a piezoelectric film, and an IDT electrode are stacked in this order. A comb capacitive electrode electrically coupled to the filter is provided on the piezoelectric film. Where λc is a wavelength determined by an electrode finger pitch of the comb capacitive electrode, and, among modes of an elastic wave generated by the comb capacitive electrode, Vis an acoustic velocity of a P+SV wave, Vis an acoustic velocity of a SH wave, and Vis an acoustic velocity of, out of higher-order modes of a SH wave, a higher-order mode at the lowest frequency side, V<V<V. Where fis a cutoff frequency on a lower frequency side of the filter, fis a cutoff frequency on a higher frequency side, and Euler angles (0°, θ, ψ) represent a propagation direction, with respect to a crystal of the piezoelectric film, of an elastic wave generated by the comb capacitive electrode, given any θ and ψ, V/λ<fand V/λ>f, or V/λ<fand V/λ>f.