公开(公告)号：EP1453197A4

公开(公告)日：2007-08-15

申请号：EP02767902

申请日：2002-09-05

申请人： FUJITSU MEDIA DEVICES LTD

发明人： UEDA MASANORI ,  KAWACHI OSAMU ,  TAJIMA MOTOYUKI ,  HASHIMOTO KENYA ,  ABE TAKUYA

IPC分类号： H03H9/00 ,  H03H9/02 ,  H03H9/145 ,  H03H9/64

CPC分类号： H03H9/6469 ,  H03H9/0071 ,  H03H9/14535 ,  H03H9/6436 ,  H03H9/6476 ,  H03H9/6483

摘要： A surface acoustic wave filter of low loss and wide-band attenuation characteristics has a piezoelectric substrate, a pair of reflection electrodes formed on the piezoelectric substrate, and comb-shaped electrodes formed on the piezoelectric substrate in front of the pair of reflection electrodes. The electrode pitch of one of two adjacent comb-shaped electrodes of the pair of comb-shaped electrodes is so set that the phase of a surface acoustic wave generated by the two comb-shaped electrodes may vary continuously in the gap from the outermost finger electrode of the other adjacent comb-shaped electrode.

摘要翻译： 具有低损耗和宽频带衰减特性的表面声波滤波器具有压电基片，形成在压电基片上的一对反射电极和形成在该对反射电极前面的压电基片上的梳形电极。 一对梳形电极中两个相邻梳形电极中的一个梳形电极的电极间距设置成使得由两个梳形电极生成的表面声波的相位可以在与最外指形电极的间隙中连续变化 另一个相邻的梳形电极。