公开(公告)号：US09425763B2

公开(公告)日：2016-08-23

申请号：US14478137

申请日：2014-09-05

申请人： Murata Manufacturing Co., Ltd.

发明人： Takahiro Norichi

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

CPC分类号： H03H9/0047 ,  H03H9/0057 ,  H03H9/14588 ,  H03H9/6469

摘要： A longitudinally-coupled-resonator-type surface acoustic wave filter includes an unbalanced terminal, balanced terminals, a piezoelectric substrate, a first surface acoustic wave filter unit, a second surface acoustic wave filter unit, an unbalanced signal wiring line, balanced signal wiring lines, a pair of interstage wiring lines that connect the first surface acoustic wave filter unit and the second surface acoustic wave filter unit to each other, and ground wiring lines. The first surface acoustic wave filter unit includes a first IDT and a pair of a second IDT and a third IDT. The first IDT includes a pair of first divided comb tooth shaped electrodes obtained by dividing a comb tooth shaped electrode on the side spaced from the unbalanced terminal along a central axis.

摘要翻译： 纵向耦合谐振器型表面声波滤波器包括不平衡端子，平衡端子，压电基板，第一表面声波滤波器单元，第二表面声波滤波器单元，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和第二声表面波滤波器单元彼此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包括第一IDT和一对第二IDT和第三IDT。 第一IDT包括一对第一分开的梳齿状电极，其通过沿与中心轴线不平衡端子间隔开的一侧分割梳齿状电极而获得。