公开(公告)号：EP2068443A1

公开(公告)日：2009-06-10

申请号：EP07791867.0

申请日：2007-08-02

申请人： Murata Manufacturing Co. Ltd.

发明人： MUKAI, Takao, c/o (A170) IP Department ,  YATA, Masaru, c/o (A170) IP Department ,  FUJII, Yasuhisa, c/o (A170) IP Department

IPC分类号： H03H9/64 ,  H01L41/09 ,  H01L41/18 ,  H03H9/145 ,  H03H9/25

CPC分类号： H03H9/6433 ,  H03H9/0028 ,  H03H9/0222 ,  H03H9/02559 ,  H03H9/02574 ,  H03H9/14594 ,  H03H9/6469

摘要： A boundary acoustic wave filter device that is able to reduce an insertion loss within a pass band is provided. A longitudinally coupled resonator boundary acoustic wave filter device 100 includes: a piezoelectric substance made of LiNbO 3 having a principal plane obtained by rotating the Y-axis through 15 degrees +-10 degrees; a dielectric substance made of silicon oxide and laminated on the piezoelectric substance; and an electrode structure arranged at a boundary between the piezoelectric substance and the dielectric substance. The electrode structure includes: a plurality of IDTs 112 to 114, 122 to 124, 132 to 134, 142 to 144, 152 to 154, and 162 to 164, arranged in a direction in which a boundary acoustic wave propagates; and reflectors 111, 115, 121, 125, 131, 135, 141, 145, 151, 155, 161 and 165, and wherein where in each of the plurality of IDTs, the overlap width of electrode fingers is W and the interval of electrode fingers is P, 20 ≤ W/P ≤ 45 is satisfied.

摘要翻译： 提供一种能够降低通带内的插入损耗的弹性边界波滤波器装置。 纵耦合谐振器型弹性边界波滤波器元件100具备：由LiNbO 3构成的压电体，其具有使Y轴旋转15度±10度而得到的主面; 由氧化硅制成并且层压在压电物质上的电介质; 以及布置在压电物质和电介质之间的边界处的电极结构。 电极结构包括：沿边界声波传播方向排列的多个IDT112至114,122至124,132至134,142至144,152至154和162至164; 以及反射器111,115,121,125,131,135,141,145,151,155,161和165，并且其中在多个IDT中的每一个中，电极指的重叠宽度是W并且电极的间隔 手指为P，满足20≤W/P≤45。