公开(公告)号：US20250158593A1

公开(公告)日：2025-05-15

申请号：US19024548

申请日：2025-01-16

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Kentaro NAKAMURA ,  Takuya YABU

IPC: H03H9/13 ,  H03H9/02 ,  H03H9/56

Abstract: An acoustic wave device includes a piezoelectric substrate including a piezoelectric layer, and an IDT electrode on the piezoelectric layer. The IDT electrode includes first and second electrode fingers with a circular arc or an elliptical arc shape. When a virtual line connecting tip ends of the second electrode fingers is a first envelope, a virtual line connecting tip ends of the first electrode fingers is a second envelope, and a center of a circle including the circular arc or a midpoint of focal points of an ellipse including the elliptical arc of the first and second electrode fingers is a fixed point, a straight line connecting the fixed point and the tip end of the second electrode finger is not parallel to the first envelope, and a straight line connecting the fixed point and the tip end of the first electrode finger is not parallel to the second envelope.

公开(公告)号：US20240250658A1

公开(公告)日：2024-07-25

申请号：US18530298

申请日：2023-12-06

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takuro OKADA ,  Kentaro NAKAMURA ,  Takuya YABU

IPC: H03H9/02 ,  H03H9/205

CPC classification number: H03H9/02228 ,  H03H9/02015 ,  H03H9/02086 ,  H03H9/205

Abstract: An acoustic wave device includes a piezoelectric substrate including a piezoelectric layer, and IDT electrodes on the piezoelectric substrate and including curved IDT electrodes. A direction in which a portion of the electrode finger with a curved shape in the curved IDT electrode is convex is an outer side direction. Acoustic wave resonators include first and second acoustic wave resonators including first and second curved IDT electrodes, respectively. The first and second acoustic wave resonators are connected without another acoustic wave resonator interposed therebetween. When one of the directions in which electrode fingers are arranged is a first direction and a direction opposite to the first direction is a second direction, the outer side direction in the first IDT electrode is the first direction, and the outer side direction of the second IDT electrode is the second direction.

公开(公告)号：US20250167756A1

公开(公告)日：2025-05-22

申请号：US19007660

申请日：2025-01-02

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takuya YABU ,  Ryo NAKAGAWA ,  Kentaro NAKAMURA

IPC: H03H9/02 ,  H03H9/13 ,  H03H9/56

Abstract: An acoustic wave device includes a piezoelectric substrate including a piezoelectric layer, and an IDT electrode on the piezoelectric layer. The IDT electrode includes first and second busbars facing each other, first electrode fingers each of which includes one end connected to the first busbar, and second electrode fingers each of which includes one end connected to the second busbar. The first and second electrode fingers are interdigitated with each other. A portion where the first and second electrode fingers overlap in an acoustic wave propagation direction is an intersecting region. A shape of the first and second electrode fingers in plan view includes a curved portion. In the intersecting region, resonant frequencies or anti-resonant frequencies are the same or substantially the same.

公开(公告)号：US20250030403A1

公开(公告)日：2025-01-23

申请号：US18736823

申请日：2024-06-07

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Kentaro NAKAMURA ,  Takuro OKADA ,  Takuya YABU

IPC: H03H9/56 ,  H03H9/13 ,  H03H9/205 ,  H03H9/70

Abstract: A filter device includes a first signal terminal, a second signal terminal, and a plurality of resonators including a plurality of series arm resonators and a plurality of parallel arm resonators. At least one of the plurality of series arm resonators and the plurality of parallel arm resonators is an excitation angle change resonator. The excitation angle change resonator includes a piezoelectric substrate including a piezoelectric body layer, and an IDT electrode including a plurality of electrode fingers provided on the piezoelectric substrate. The piezoelectric body layer has a propagation axis. The plurality of electrode fingers are curved. An excitation direction of an acoustic wave in a portion of an electrode finger in the plurality of electrode fingers is one of first to third directions.

公开(公告)号：US20250030400A1

公开(公告)日：2025-01-23

申请号：US18736827

申请日：2024-06-07

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takuya YABU ,  Kentaro NAKAMURA

IPC: H03H9/145 ,  H03H9/02 ,  H03H9/25 ,  H03H9/64

Abstract: An acoustic wave device includes acoustic wave resonators each including a piezoelectric substrate including a piezoelectric body layer, and an IDT electrode on the piezoelectric substrate and including electrode fingers. At least one of the acoustic wave resonators is an excitation angle change resonator, in which, the piezoelectric body layer includes a propagation axis and the electrode fingers are curved. In the excitation angle change resonator, an excitation direction of an acoustic wave in a portion of one of the electrode fingers is one of first, second, or third directions. An excitation angle of the excitation angle change resonator is not uniform in the IDT electrode.