公开(公告)号：EP1249934B1

公开(公告)日：2013-07-31

申请号：EP02290880.0

申请日：2002-04-09

Applicant: MURATA MANUFACTURING CO., LTD.

Inventor： Shibata, Osamu ,  Takamine, Yuichi ,  Watanabe, Hiroki ,  Yata, Masaru ,  Sawada, Yoichi

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

CPC classification number: H03H9/008 ,  H03H9/0038 ,  H03H9/0042 ,  H03H9/0061 ,  H03H9/0071 ,  H03H9/0085 ,  H03H9/02748 ,  H03H9/14517 ,  H03H9/14532 ,  H03H9/14547 ,  H03H9/14576 ,  H03H9/14579 ,  H03H9/14582 ,  H03H9/14585 ,  H03H9/14588 ,  H03H9/14591 ,  H03H9/6436

公开(公告)号：EP1168612B1

公开(公告)日：2013-04-17

申请号：EP01401683.6

申请日：2001-06-26

Applicant: MURATA MANUFACTURING CO., LTD.

Inventor： Takamine, Yuichi ,  Shimoe, Kazunobu ,  Taga, Shigeto

IPC: H03H9/00 ,  H03H9/64 ,  H03H9/10 ,  H03H9/05 ,  H03H9/145

CPC classification number: H03H9/0061 ,  H01L2224/05554 ,  H01L2224/16225 ,  H01L2224/48227 ,  H01L2924/15174 ,  H01L2924/16195 ,  H03H9/0042 ,  H03H9/0057 ,  H03H9/0085 ,  H03H9/059 ,  H03H9/1071 ,  H03H9/14588 ,  H03H9/6489

公开(公告)号：EP1269627B1

公开(公告)日：2012-08-15

申请号：EP01915022.6

申请日：2001-02-20

Applicant: EPCOS AG

Inventor： HAGN, Peter ,  SELMEIER, Peter

IPC: H03H9/00 ,  H03H9/145

CPC classification number: H03H9/0057 ,  H03H9/0028 ,  H03H9/0038 ,  H03H9/0061 ,  H03H9/14588

Abstract: A DMS filter is disclosed, with a first and second inter-digital converter as signal input or output, arranged between reflector structures, whereby at least one acoustic track has a mid-converter split into part converters, symmetrically arranged about the perpendicular to the propagating direction. The DMS filter is linked to a housing with connector pads or pins in a symmetrical manner, such that an axially symmetrical connection layout is achieved.

公开(公告)号：EP2355348A4

公开(公告)日：2012-06-20

申请号：EP09828746

申请日：2009-07-29

Applicant: MURATA MANUFACTURING CO

Inventor： TAKAMINE YUICHI

IPC: H03H9/64 ,  H01L41/09 ,  H01L41/18 ,  H03H9/00 ,  H03H9/145 ,  H03H9/25

CPC classification number: H03H9/0061 ,  H03H9/0071 ,  H03H9/0222 ,  H03H9/173 ,  H03H9/706 ,  H03H9/725

Abstract: To provide an acoustic wave filter device that includes longitudinally-coupled-resonator acoustic wave filters having a balanced-unbalanced conversion function and that is capable of increasing the amount of attenuation in an attenuation band and capable of improving the isolation characteristics when the acoustic wave filter device is used as a reception filter of a duplexer, an acoustic wave filter device includes an unbalanced terminal (7); first and second balanced terminals (8 and 9); first and second longitudinally-coupled-resonator acoustic wave filters (11 and 12) that are connected between the unbalanced terminal (7) and the first balanced terminal (8) and between the unbalanced terminal (7) and the second balanced terminal (9), respectively; a first parallel resonator (13) connected between the first balanced terminal (8) and a ground potential; and a second parallel resonator (14) connected between the second balanced terminal (9) and the ground potential. The electrostatic capacitance of the first parallel resonator (13) is different from the electrostatic capacitance of the second parallel resonator (14). Among the first parallel resonator (13) and the second parallel resonator (14), the wavelength of the first parallel resonator (13) having a relatively small electrostatic capacitance is made shorter than the wavelength of the second parallel resonator (14) having a relatively large electrostatic capacitance.

公开(公告)号：EP2063530A4

公开(公告)日：2012-01-25

申请号：EP07828519

申请日：2007-09-27

Applicant: MURATA MANUFACTURING CO

Inventor： TAKAMINE YUICHI

IPC: H03H9/145 ,  H03H9/00 ,  H03H9/64 ,  H03H9/72

CPC classification number: H03H9/0061 ,  H03H9/0085 ,  H03H9/14588 ,  H03H9/6469 ,  H03H9/725

公开(公告)号：EP2131493A4

公开(公告)日：2011-07-20

申请号：EP08751913

申请日：2008-04-22

Applicant: MURATA MANUFACTURING CO

Inventor： FUNAHASHI KENTARO ,  MATSUDA ICHIROU

IPC: H03H9/72 ,  H01L41/09 ,  H03H9/00 ,  H03H9/05 ,  H03H9/145 ,  H03H9/17 ,  H03H9/25 ,  H03H9/64

CPC classification number: H03H9/0576 ,  H03H9/0057 ,  H03H9/0061 ,  H03H9/0071 ,  H03H9/0076 ,  H03H9/0085 ,  H03H9/6436 ,  H03H9/6473 ,  H03H9/6476 ,  H03H9/6483 ,  H03H9/725

公开(公告)号：EP1739830A4

公开(公告)日：2009-04-22

申请号：EP05728857

申请日：2005-04-04

Applicant: MURATA MANUFACTURING CO

Inventor： SHIBAHARA TERUHISA ,  TANI MASAKAZU ,  SHIN YASUAKI

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

CPC classification number: H03H9/0222 ,  H03H9/0061 ,  H03H9/02952 ,  H03H9/14588 ,  H03H9/6469

Abstract: On a piezoelectric substrate, there are formed a plurality of longitudinally-connected resonator type elastic wave filter elements, which are cascade-connected so as to constitute an elastic wave filter. By reducing the adverse affect of the parasitic capacitance coming into the cascade connection between the longitudinally-connected resonator type elastic wave filter elements, it is possible to improve the impedance matching at the cascade connection point and improve VSWR at the elastic wave filter I/O terminal. The elastic wave filter (350) includes a piezoelectric substrate (300) having a cascade connection of two longitudinally-connected resonator type elastic wave filters (306, 312), each connecting three IDT (302, 303, 304; 308, 309, 310) formed along the propagation direction of the elastic wave. At least in one of the longitudinally-connected resonator type elastic wave filters (306, 311), the IDT (302, 304; 308, 310) have an electrode finger pitch smaller than the electrode finger pitch of the other IDT (303; 309).

公开(公告)号：EP1467485B1

公开(公告)日：2008-08-27

申请号：EP04290950.7

申请日：2004-04-09

Applicant: MURATA MANUFACTURING CO., LTD.

Inventor： Ouchi Minefumi c/o Intellectual Property Depart. ,  Nakahashi, Norihiko c/o Intellectual Property Dep.

IPC: H03H9/64

CPC classification number: H03H9/0061 ,  H03H9/0057 ,  H03H9/0085 ,  H03H9/14582 ,  H03H9/14588

公开(公告)号：EP1175006A4

公开(公告)日：2006-02-08

申请号：EP01901488

申请日：2001-01-22

Applicant: TOYO COMMUNICATION EQUIP

Inventor： TAKAHASHI NAOKI

IPC: H03H9/00 ,  H03H9/145 ,  H03H9/64

CPC classification number: H03H9/6469 ,  H03H9/0061 ,  H03H9/02637 ,  H03H9/14538 ,  H03H9/14552 ,  H03H9/14576 ,  H03H9/14582 ,  H03H9/14585

Abstract: A filter comprising two cascaded primary-tertiary longitudinal coupling dual-mode SAW filters provided so as to flatten the passband of the filter and three IDT electrodes arranged with electrode finger pitches L1 so as to decrease the VSWR below 2, wherein the pitch L2 of the central IDT electrodes of one of the dual-mode SAW filters is larger than the pitch L1, electrode fingers are symmetrically removed from both sides of the IDT electrode, and the removed electrode fingers are connected to the opposed IDT electrode so as to use them as dummy electrodes with pitches L2.

公开(公告)号：EP1276235A1

公开(公告)日：2003-01-15

申请号：EP02015561.0

申请日：2002-07-11

Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

Inventor： Nakamura, Hiroyuki ,  Nishimura, Kazunori ,  Tsunekawa, Akio

IPC: H03H9/145

CPC classification number: H03H9/14547 ,  H03H9/0061 ,  H03H9/14582 ,  H03H9/25

Abstract: A surface acoustic wave filter has

a piezoelectric substrate;
at last an input IDT electrode arranged on the piezoelectric substrate; and
at least an output IDT electrode arranged on the piezoelectric substrate,
   wherein a pitch of electrode fingers of the input IDT electrode and a pitch of electrode fingers of the output IDT electrode are different from each other.

Abstract translation: 表面声波滤波器具有压电基板; 最后设置在压电基板上的输入IDT电极; 以及布置在所述压电基板上的至少一个输出IDT电极，其中所述输入IDT电极的电极指的间距和所述输出IDT电极的电极指的间距彼此不同。