公开(公告)号：US5400001A

公开(公告)日：1995-03-21

申请号：US123468

申请日：1993-09-20

申请人： Yasuteru Asakawa ,  Toshio Ishizaki ,  Yukihiko Ise ,  Hiroshi Fukushima ,  Yukio Kashiwagi ,  Tomoki Uwano

发明人： Yasuteru Asakawa ,  Toshio Ishizaki ,  Yukihiko Ise ,  Hiroshi Fukushima ,  Yukio Kashiwagi ,  Tomoki Uwano

IPC分类号： H03H3/04 ,  H03H9/02 ,  H03H9/17 ,  H03H9/60 ,  H03H9/15

CPC分类号： H03H9/176 ,  H03H9/02157 ,  H03H9/605

摘要： In a piezoelectric resonator having a piezoelectric bar formed in a substantial rectangular parallelopiped and electrodes formed on a pair of confronting surfaces of the piezoelectric bar for resonating in the length expander mode, the piezoelectric bar has at least a bevel portion extending the longitudinal direction. In a ladder filter having series and parallel piezoelectric resonators, the series piezoelectric resonator has the bevel portion to shift a frequency of a spurious response to that of the parallel piezoelectric resonator to suppress the spurious response. It is disclosed that a second piezoelectric resonator has a piezoelectric bar formed in a rectangular parallelopiped has a length L, a width W, and a thickness T wherein L>W>T; and electrodes formed on a pair of confronting surfaces defined by L and T. Another ladder filter includes the second piezoelectric resonator as the series resonator to decrease a capacitance between the electrodes to increase an amount of attenuation. In the second piezoelectric resonator, when W

摘要翻译： 在压电谐振器中，具有形成在大致矩形平行六面体的压电棒和形成在压电棒的一对相对表面上的电极，用于在长度扩展器模式下谐振，所述压电棒至少具有沿纵向方向延伸的斜面部分。 在具有串联和并联压电谐振器的梯形滤波器中，串联压电谐振器具有斜面部分，以将杂散响应的频率移动到并联压电谐振器的频率以抑制杂散响应。 公开了第二压电谐振器具有形成为长方体形状的压电棒，其长度L，宽度W和厚度T，其中L> W> T; 以及形成在由L和T限定的一对相对表面上的电极。另一个梯形滤波器包括作为串联谐振器的第二压电谐振器，以减小电极之间的电容以增加衰减量。 在第二压电谐振器中，当W