Invention Grant
- Patent Title: Boundary acoustic wave device having three-medium structure
- Patent Title (中): 具有三介质结构的边界声波装置
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Application No.: US13172966Application Date: 2011-06-30
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Publication No.: US08179017B2Publication Date: 2012-05-15
- Inventor: Takashi Yamane
- Applicant: Takashi Yamane
- Applicant Address: JP Kyoto
- Assignee: Murata Manufacturing Co., Ltd.
- Current Assignee: Murata Manufacturing Co., Ltd.
- Current Assignee Address: JP Kyoto
- Agency: Keating & Bennett, LLP
- Priority: JP2009-001666 20090107
- Main IPC: H03H9/25
- IPC: H03H9/25 ; H01L41/08

Abstract:
A boundary acoustic wave device that has a three-medium structure and that prevents a high-order mode spurious response includes a piezoelectric substrate, a first dielectric layer laminated on the piezoelectric substrate, a second dielectric layer laminated on the first dielectric layer, and an IDT electrode provided at an interface between the piezoelectric substrate and the first dielectric layer. The boundary acoustic wave device utilizes a Stoneley wave that propagates along the interface. Where V1 denotes an acoustic velocity of a slow transversal bulk wave in the piezoelectric substrate and Va denotes an acoustic velocity at an anti-resonant point in a high-order mode of the Stoneley wave, Va>V1 is satisfied.
Public/Granted literature
- US20110254406A1 BOUNDARY ACOUSTIC WAVE DEVICE Public/Granted day:2011-10-20
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