公开(公告)号：US07301421B2

公开(公告)日：2007-11-27

申请号：US11169160

申请日：2005-06-28

申请人： Yuuko Yokota ,  Masayuki Funami ,  Takanori Ikuta ,  Wataru Koga ,  Yoshifumi Yamagata ,  Motoki Ito ,  Kiyohiro Iioka

发明人： Yuuko Yokota ,  Masayuki Funami ,  Takanori Ikuta ,  Wataru Koga ,  Yoshifumi Yamagata ,  Motoki Ito ,  Kiyohiro Iioka

IPC分类号： H03H9/72 ,  H03H9/64

CPC分类号： H03H9/02921 ,  H01L2224/97 ,  H01L2924/16195 ,  H03H3/08 ,  H03H9/02874 ,  H03H9/0576 ,  H03H9/059 ,  H03H9/1085 ,  H03H9/72 ,  H03H9/725

摘要： A conductor layer 10 is provided so as to prevent pyroelectric destruction occurring in the steps of manufacturing a surface acoustic wave element 1 on the other surface opposite to an IDT electrode formation surface of a piezoelectric substrate 2. At this time, the conductor layer 10 is formed, except for a region 5a opposed to an input electrode section 5 in a filter region 9 and/or a region 6a opposed to an output electrode section 6. This allows a coupling amount between the input electrode section 5 and the output electrode section 6 due to a parasitic capacitance formed between the input electrode section 5 and the output electrode section 6 in the filter region 9 to be reduced, thereby allowing the out-of-band attenuation characteristics of a surface acoustic wave device to be improved.

摘要翻译： 在与压电基板2的IDT电极形成面相反的另一面上制造表面声波元件1的步骤中，设置导体层10，以防止发生热电破坏。 此时，除了与输出电极部6相对的过滤器区域9和/或区域6a中的与输入电极部5相对的区域5a之外，还形成导体层10。 这允许由于在滤波器区域9中形成的输入电极部分5和输出电极部分6之间形成的寄生电容而使输入电极部分5与输出电极部分6之间的耦合量减小，从而允许 提高声表面波器件的带衰减特性。

公开(公告)号：US20060018082A1

公开(公告)日：2006-01-26

申请号：US11169227

申请日：2005-06-27

申请人： Yoshifumi Yamagata ,  Hiroshi Katta

发明人： Yoshifumi Yamagata ,  Hiroshi Katta

IPC分类号： H01G4/06

CPC分类号： H01G5/38

摘要： A variable capacitance capacitor has a plurality of variable capacitance elements, using a thin-film dielectric layer whose dielectric constant varies with voltage application, connected in series with one another between the high-frequency signal input and output terminals. The first bias lines belonging to a high-potential side and the second bias lines belonging to a low-potential side, in terms of voltage application, are connected, alternately, to electrodes of the variable capacitance elements connected one another and electrodes in the array of the series-connected variable capacitance elements connected respectively to the input terminal and the output terminal.

公开(公告)号：US5374910A

公开(公告)日：1994-12-20

申请号：US982788

申请日：1992-11-30

申请人： Yoshifumi Yamagata

发明人： Yoshifumi Yamagata

IPC分类号： H01P1/205 ,  H01P1/202

CPC分类号： H01P1/2053

摘要： A dielectric filter comprises a filtering member made up of resonators, intercoupled through a laminated substrate joined to the filtering member and containing interlaminal patterned conductive platings constituting capacitive and inductive elements. Electric field leakage arising among the conductive platings is reduced, improving the effective dielectric constant of the substrate. The extent of the conductive platings providing desired capacitance and selected electrical length is reducible, to decrease the size of the substrate. Furthermore, the substrate construction prevents foreign matter from becoming lodged on, or even from being brought into contact with, the conductive platings, stabilizing capacitive coupling.

摘要翻译： 介质滤波器包括由谐振器构成的滤波构件，通过与滤波构件连接的层叠基板相互耦合并且包含构成电容和电感元件的层间导电电镀层。 在导电电镀中产生的电场泄漏减少，提高了衬底的有效介电常数。 提供所需电容和所选电长度的导电电镀的程度可以减小，以减小基片的尺寸。 此外，基板结构防止异物与导电性电镀层接触，甚至与导体电镀接触，稳定电容耦合。