公开(公告)号：DE19938748B4

公开(公告)日：2007-02-01

申请号：DE19938748

申请日：1999-08-16

Applicant: EPCOS AG

Inventor： STRAUSS GEORG

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

Abstract: A dual mode SAW filter is provided with improved symmetry and/or blocking attenuation by selecting the structure in one-track, two-track embodiment and with potentially split track, in which first transducers and second transducers, these as input transducers and/or output transducers and/or coupling transducers (given a multi-track embodiment), always have an even-numbered plurality of fingers and are point-symmetrical.

公开(公告)号：DE50011392D1

公开(公告)日：2005-11-24

申请号：DE50011392

申请日：2000-07-26

Applicant: EPCOS AG

Inventor： STRAUSS GEORG

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

Abstract: A dual mode SAW filter is provided with improved symmetry and/or blocking attenuation by selecting the structure in one-track, two-track embodiment and with potentially split track, in which first transducers and second transducers, these as input transducers and/or output transducers and/or coupling transducers (given a multi-track embodiment), always have an even-numbered plurality of fingers and are point-symmetrical.

公开(公告)号：DE19818826B4

公开(公告)日：2004-11-04

申请号：DE19818826

申请日：1998-04-27

Applicant: EPCOS AG

Inventor： MACHUI JUERGEN ,  STRAUSS GEORG ,  HAGN PETER ,  DETLEFSEN ANDREAS ,  BAIER THOMAS

IPC: H03H9/00 ,  H03H9/25 ,  H03H9/64 ,  H04Q7/32

公开(公告)号：CA2294168A1

公开(公告)日：1998-12-17

申请号：CA2294168

申请日：1998-06-09

Applicant: EPCOS AG

Inventor： BAIER THOMAS ,  STRAUSS GEORG

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

Abstract: The invention relates to a dual-mode surface wave filter which can be operated in a symmetrical or asymmetrical manner, comprising tracks (A, B) which are coupled to each other by transformers and interdigital converters for each track arranged inside reflectors and acting as input or output converters. The impedance of the input and/or output converters of the filter is determined by omission or overlapping weighting and/or by dividing the input and output converters according to each acoustic track (A, B) into several at least partially series-connected individual converters (W3-W6).

公开(公告)号：DE59705904D1

公开(公告)日：2002-01-31

申请号：DE59705904

申请日：1997-09-16

Applicant: EPCOS AG

Inventor： STRAUSS GEORG ,  BAUREGGER JOSEF

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

Abstract: PCT No. PCT/DE97/02076 Sec. 371 Date Feb. 25, 1999 Sec. 102(e) Date Feb. 25, 1999 PCT Filed Sep. 16, 1997 PCT Pub. No. WO98/12809 PCT Pub. Date Mar. 26, 1998Surface wave filter for asymmetrical/symmetrical and symmetrical/symmetrical operating mode, with interdigital output transformers (IDT2, IDT4) connected in series.

公开(公告)号：DE59805522D1

公开(公告)日：2002-10-17

申请号：DE59805522

申请日：1998-06-09

Applicant: EPCOS AG

Inventor： BAIER THOMAS ,  STRAUSS GEORG

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

Abstract: A dual-mode surface acoustic wave filter that can optionally be operated balanced or unbalanced, having tracks which are coupled to one another via coupling converters. The filter has interdigital converters for each track which are disposed within reflectors and act as input and output converters. The impedance of the input and/or output converters of the filter is determined by omission or overlap weighting and/or by splitting the input and output converters into a plurality of individual converters. At least some of the individual converters are connected in series, for each acoustic track.

公开(公告)号：DE19938748A1

公开(公告)日：2001-03-22

申请号：DE19938748

申请日：1999-08-16

Applicant: EPCOS AG

Inventor： STRAUSS GEORG

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

Abstract: A dual mode SAW filter is provided with improved symmetry and/or blocking attenuation by selecting the structure in one-track, two-track embodiment and with potentially split track, in which first transducers and second transducers, these as input transducers and/or output transducers and/or coupling transducers (given a multi-track embodiment), always have an even-numbered plurality of fingers and are point-symmetrical.

公开(公告)号：CA2381262A1

公开(公告)日：2001-02-22

申请号：CA2381262

申请日：2000-07-26

Applicant: EPCOS AG

Inventor： STRAUSS GEORG

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

Abstract: A dual-mode surface wave (SAW) filter with enhanced symmetry and/or stop-ban d attenuation by choosing the one or two track embodiment and eventually a spl it track (10', 10"). The first converter (11, 111...) and second converter (21, 22...) as input and/or output and/or coupling converter (in a multiple track embodiment) always have even number of fingers and are point-symmetrical.