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. 20, 2010
Filed:
Dec. 02, 2008
Kenji Nishiyama, Yasu, JP;
Takeshi Nakao, Omihachiman, JP;
Michio Kadota, Kyoto, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A surface acoustic wave device has a duty that is greater than about 0.5, attenuation outside the pass band is increased, and an undesirable spurious response is effectively suppressed. The surface acoustic wave device includes an LiNbOsubstrate having Euler angles (0°±5°, θ±5°, 0°±10°), an electrode that is provided on the LiNbOsubstrate and that includes an IDT electrode primarily made of Cu, a first silicon oxide film that is provided in an area other than an area in which the electrode is arranged so as to have a thickness substantially equal to that of the electrode, and a second silicon oxide film that is arranged so as to cover the electrode and the first silicon oxide film, wherein the surface acoustic wave device utilizes an SH wave, wherein a duty D of the IDT electrodeis at least about 0.52, and θ of the Euler angles (0°±5, θ+5°, 0°±10°) is set so as to fall within a range that satisfies the following Inequality (1A) or (1B):(1) When 0.52≦0.6, −10+92.5−100≦θ≦37.5−57.75+104.075+5710−1105.7+45.729   Inequality (1A)(2) When>0.6, 86.5−100≦θ≦37.5×D−57.75+104.075+5710−1105.7+45.729  Inequality (1B)