公开(公告)号：US20250015779A1

公开(公告)日：2025-01-09

申请号：US18897222

申请日：2024-09-26

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Toru YAMAJI ,  Sunao YAMAZAKI ,  Hiroya SUZUKI

IPC: H03H9/13 ,  H03H9/02

Abstract: An acoustic wave device includes a support including a support substrate, a piezoelectric layer on the support in a first direction, a functional electrode on the piezoelectric layer, and a reinforcement film on the piezoelectric layer. The support includes a space portion that opens on a side of the piezoelectric layer, and an extended passage extending farther toward an outer side than an edge of the space portion in a second direction intersecting the first direction. A through-hole is provided at a position not overlapping the functional electrode in plan view in the first direction, communicates with the extended passage, and penetrates the piezoelectric layer. The reinforcement film is provided in a region between the through-hole and the space portion and overlaps at least a portion of a region where the piezoelectric layer and the extended passage overlap each other in the plan view.

公开(公告)号：US20220131528A1

公开(公告)日：2022-04-28

申请号：US17567920

申请日：2022-01-04

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Sunao YAMAZAKI

IPC: H03H9/56 ,  H03H9/13 ,  H03H9/54

Abstract: A ladder filter includes series arm resonators, parallel arm resonators, and first and second inductors. Second ends of the parallel arm resonators are connected in common to each other and are connected to a ground potential. A first end of each of the first and second inductors is connected to a series arm, and second ends thereof are connected in common to each other and are connected to the ground potential with a capacitor therebetween.

公开(公告)号：US20130241674A1

公开(公告)日：2013-09-19

申请号：US13890284

申请日：2013-05-09

Applicant: MURATA MANUFACTURING CO., LTD.

Inventor： Sunao YAMAZAKI ,  Katsuhito KURODA

IPC: H03H9/58 ,  H03H9/64

CPC classification number: H03H9/64 ,  H03H9/6483

Abstract: An elastic wave filter device has a center frequency of a reception frequency band. A plurality of parallel arms are connected to a portion of a series arm on a second signal terminal side of a portion in which a first series-arm resonator is provided. Series-arm resonators among the plurality of series-arm resonators other than the first series-arm resonator include a series-arm resonator having a resonant frequency higher than the resonant frequency of the first series-arm resonator. The resonant frequency of the first series-arm resonator is equal to the reception frequency band.

Abstract translation: 弹性波滤波器装置具有接收频带的中心频率。 多个并联臂与设置有第一串联臂谐振器的部分的第二信号端子侧的串联臂的一部分连接。 除了第一串联臂谐振器之外的多个串联臂谐振器中的串联臂谐振器包括具有高于第一串联臂谐振器的谐振频率的谐振频率的串联臂谐振器。 第一串联臂谐振器的谐振频率等于接收频带。