公开(公告)号：EP2830217A4

公开(公告)日：2016-02-24

申请号：EP13764500

申请日：2013-03-15

Applicant: MURATA MANUFACTURING CO

Inventor： NORICHI TAKAHIRO

IPC: H03H9/64 ,  H03H9/00 ,  H03H9/145

CPC classification number: H03H9/0047 ,  H03H9/0057 ,  H03H9/14588 ,  H03H9/6469

Abstract: A longitudinally-coupled-resonator-type surface acoustic wave filter includes an unbalanced terminal (10), balanced terminals (20), a piezoelectric substrate, a first surface acoustic wave filter unit (11), a second surface acoustic wave filter unit (12), an unbalanced signal wiring line, balanced signal wiring lines, a pair of interstage wiring lines that connect the first surface acoustic wave filter unit (11) and the second surface acoustic wave filter unit (12) to each other, and ground wiring lines. The first surface acoustic wave filter unit (11) includes a first IDT (111) and a pair of a second IDT and a third IDT (112). The first IDT (111) includes a pair of first divided comb tooth shaped electrodes (111a) obtained by dividing a comb tooth shaped electrode on the side far from the unbalanced terminal (10) along a central axis x. The pair of first divided comb tooth shaped electrodes (111a) are connected by the interstage wiring lines to the second surface acoustic wave filter unit (12). A comb tooth shaped electrode of the second IDT and a comb tooth shaped electrode of the third IDT (112) on the side far from the unbalanced terminal (10) are respectively connected to ground wiring lines that are routed outside of the interstage wiring lines.

公开(公告)号：EP2830217B1

公开(公告)日：2018-02-21

申请号：EP13764500.8

申请日：2013-03-15

Applicant: Murata Manufacturing Co., Ltd.

Inventor： NORICHI, Takahiro

IPC: H03H9/64 ,  H03H9/00 ,  H03H9/145

CPC classification number: H03H9/0047 ,  H03H9/0057 ,  H03H9/14588 ,  H03H9/6469

Abstract: A longitudinally-coupled-resonator-type surface acoustic wave filter includes an unbalanced terminal (10), balanced terminals (20), a piezoelectric substrate, a first surface acoustic wave filter unit (11), a second surface acoustic wave filter unit (12), an unbalanced signal wiring line, balanced signal wiring lines, a pair of interstage wiring lines that connect the first surface acoustic wave filter unit (11) and the second surface acoustic wave filter unit (12) to each other, and ground wiring lines. The first surface acoustic wave filter unit (11) includes a first IDT (111) and a pair of a second IDT and a third IDT (112). The first IDT (111) includes a pair of first divided comb tooth shaped electrodes (111a) obtained by dividing a comb tooth shaped electrode on the side far from the unbalanced terminal (10) along a central axis x. The pair of first divided comb tooth shaped electrodes (111a) are connected by the interstage wiring lines to the second surface acoustic wave filter unit (12). A comb tooth shaped electrode of the second IDT and a comb tooth shaped electrode of the third IDT (112) on the side far from the unbalanced terminal (10) are respectively connected to ground wiring lines that are routed outside of the interstage wiring lines.

公开(公告)号：EP2830217A1

公开(公告)日：2015-01-28

申请号：EP13764500.8

申请日：2013-03-15

Applicant: Murata Manufacturing Co., Ltd.

Inventor： NORICHI, Takahiro

IPC: H03H9/64

CPC classification number: H03H9/0047 ,  H03H9/0057 ,  H03H9/14588 ,  H03H9/6469

Abstract: A longitudinally-coupled-resonator-type surface acoustic wave filter includes an unbalanced terminal (10), balanced terminals (20), a piezoelectric substrate, a first surface acoustic wave filter unit (11), a second surface acoustic wave filter unit (12), an unbalanced signal wiring line, balanced signal wiring lines, a pair of interstage wiring lines that connect the first surface acoustic wave filter unit (11) and the second surface acoustic wave filter unit (12) to each other, and ground wiring lines. The first surface acoustic wave filter unit (11) includes a first IDT (111) and a pair of a second IDT and a third IDT (112). The first IDT (111) includes a pair of first divided comb tooth shaped electrodes (111a) obtained by dividing a comb tooth shaped electrode on the side far from the unbalanced terminal (10) along a central axis x. The pair of first divided comb tooth shaped electrodes (111a) are connected by the interstage wiring lines to the second surface acoustic wave filter unit (12). A comb tooth shaped electrode of the second IDT and a comb tooth shaped electrode of the third IDT (112) on the side far from the unbalanced terminal (10) are respectively connected to ground wiring lines that are routed outside of the interstage wiring lines.

Abstract translation: 纵向耦合谐振器型表面声波滤波器包括不平衡端子（10），平衡端子（20），压电基板，第一表面声波滤波器单元（11），第二声表面波滤波器单元（12） ），不平衡信号布线，平衡信号布线，将第一声表面波滤波器单元（11）和第二声表面波滤波器单元（12）连接的一对级间布线，以及接地布线 。 第一表面声波滤波器单元（11）包括第一IDT（111）和一对第二IDT和第三IDT（112）。 第一IDT（111）包括沿着中心轴线x在远离不平衡端子（10）的一侧分割梳齿形电极而获得的一对第一分开的梳齿状电极（111a）。 该一对第一分割梳齿状电极（111a）通过级间布线与第二声表面波滤波器单元（12）连接。 第二IDT的梳齿形电极和远离不平衡端子（10）一侧的第三IDT（112）的梳齿状电极分别连接到布线在层间布线之外的接地布线。