公开(公告)号：US07425878B2

公开(公告)日：2008-09-16

申请号：US11413202

申请日：2006-04-28

申请人： Shogo Inoue ,  Toshio Nishizawa ,  Toshihiko Murata

发明人： Shogo Inoue ,  Toshio Nishizawa ,  Toshihiko Murata

IPC分类号： H03H9/64 ,  H03H9/72

CPC分类号： H03H9/14588 ,  H03H9/0038 ,  H03H9/008 ,  H03H9/14591 ,  H03H9/6433 ,  H03H9/6456 ,  H03H9/6489 ,  H03H9/725

摘要： A multimode type SAW filter includes a piezoelectric substrate, and IDT groups formed on the piezoelectric substrate, the IDT groups each having multiple IDTs connected in series in which an input/output electrode and a ground electrode are coupled via a floating conductor. Adjacent electrode fingers between adjacent IDTs among the multiple IDTs of the IDT groups include a first electrode finger connected to the floating conductor in one of the IDT groups and a second electrode finger connected to one of the input/output electrode and the ground electrode in another one of the IDT groups.

摘要翻译： 多模式SAW滤波器包括压电衬底和形成在压电衬底上的IDT组，每个具有串联连接的多个IDT的IDT组，其中输入/输出电极和接地电极通过浮动导体耦合。 IDT组的多个IDT之间的相邻IDT之间的相邻电极指包括连接到一个IDT组中的浮动导体的第一电极指和在另一个中的一个输入/输出电极和接地电极中的一个连接的第二电极指 其中一个IDT组。

公开(公告)号：US20070046400A1

公开(公告)日：2007-03-01

申请号：US11367555

申请日：2006-03-06

申请人： Koichi Wada ,  Seiichi Mitobe ,  Shogo Inoue

发明人： Koichi Wada ,  Seiichi Mitobe ,  Shogo Inoue

IPC分类号： H03H9/64

CPC分类号： H03H9/14532 ,  H03H9/02992 ,  H03H9/1452 ,  H03H9/14538 ,  H03H9/14547 ,  H03H9/6496

摘要： A surface acoustic wave apparatus has a configuration by which the spurious of the higher-order transverse modes is suppressed and a SAW excitation intensity distribution is not changed in the propagation direction. The surface acoustic wave apparatus has at least one interdigital transducer; a region with the plurality of interleaved comb-shaped electrodes is formed with two regions which are a first overlapping region and a second overlapping region with overlapping-lengths weighted along a propagation direction of a surface acoustic wave; the first overlapping region and the second overlapping region are in contact or overlapped in a direction vertical to the propagation direction of the surface acoustic wave; and in either the first or the second overlapping region, an overlapping-length weighting envelope curve has at least two or more changing points in the propagation direction of the surface acoustic wave.

摘要翻译： 表面声波装置具有抑制高阶横模的杂散和SAW传播方向上的SAW激发强度分布不变化的结构。 声表面波装置具有至少一个叉指式换能器; 具有多个交错梳状电极的区域形成有沿着声表面波的传播方向加权的具有重叠长度的第一重叠区域和第二重叠区域的两个区域; 第一重叠区域和第二重叠区域在与声表面波的传播方向垂直的方向上接触或重叠; 并且在第一或第二重叠区域中，重叠长度加权包络线在表面声波的传播方向上具有至少两个以上的变化点。