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公开(公告)号：EP1758245A3
公开(公告)日：2009-01-07
申请号：EP06017542.9
申请日：2006-08-23
发明人： Yoneya, Katsuro
CPC分类号： H03B5/326 , H03B2200/0048 , H03H9/6403 , H03H2250/00
摘要： A surface acoustic wave (SAW) resonator, including: a first interdigital transducer (16a) composed of a pair of interdigital electrodes (20aa, 20ab) provided in a propagation direction of a surface acoustic wave; a second interdigital transducer (16b) composed of a pair of interdigital electrodes (20ba, 20bb) provided in parallel to the first interdigital transducer; and a switch that alternately switches the pair of interdigital electrodes of the first interdigital transducer and the pair of interdigital electrodes of the second interdigital transducer; wherein
7λ ≤B ≤33λ
where λ is a wavelength of a surface acoustic wave, and B is an addition of a width a1 of an engaged section of electrode fingers of the first interdigital transducer, a width a2 of an engaged section of electrode fingers of the second interdigital transducer, and a distance b between the engaged sections of both interdigital transducers.-
公开(公告)号：EP1323232A1
公开(公告)日：2003-07-02
申请号：EP01978176.4
申请日：2001-09-20
CPC分类号： H03L7/18 , H03H3/04 , H03H9/6403 , H03H2009/02196 , H03J3/08 , H03J3/28 , H03J5/0272 , H03L7/0805
摘要： The invention relates to a component having an acoustically active material, whose acoustic constants can be at least partially altered. The acoustically active material is located at least partially at a phase transition point and/or in the vicinity of a phase transition point.
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公开(公告)号：EP0634067B1
公开(公告)日：2001-06-06
申请号：EP94905396.1
申请日：1993-12-14
申请人： CTS Corporation
发明人： BORRAS, Jaime, A. , PENUNURI, David
IPC分类号： H03H9/64
CPC分类号： H03H9/6403
摘要： A multi-bandwidth SAW filter (405) for an input signal (90) is provided which includes a SAW transducer (402) having a selectable length corresponding to the desired bandwidth of the filter. The SAW filter is responsive to a control signal (430) which corresponds to a selectable bandwidth of the filter to present the input signal to an appropriate length SAW transducer.
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公开(公告)号：EP0548911B1
公开(公告)日：1996-08-28
申请号：EP92121794.9
申请日：1992-12-22
申请人： NEC CORPORATION
IPC分类号： H03H9/64
CPC分类号： H03H9/6403
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公开(公告)号：EP0634067A1
公开(公告)日：1995-01-18
申请号：EP94905396.0
申请日：1993-12-14
申请人： MOTOROLA, INC.
发明人： BORRAS, Jaime, A. , PENUNURI, David
IPC分类号： H03H9
CPC分类号： H03H9/6403
摘要： A multi-bandwidth SAW filter (405) for an input signal (90) is provided which includes a SAW transducer (402) having a selectable length corresponding to the desired bandwidth of the filter. The SAW filter is responsive to a control signal (430) which corresponds to a selectable bandwidth of the filter to present the input signal to an appropriate length SAW transducer.
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公开(公告)号：EP0367864B1
公开(公告)日：1993-02-17
申请号：EP88118879.1
申请日：1988-11-11
发明人： Ehrmann-Falkenau, Ekkehard, Dipl.-Ing. Dr. tech. , Rott, Karlheinz, Dipl.-Mathem. , Zibis, Peter, Dipl.-Ing. , Schott, Wilfried, Dipl.-Math.
IPC分类号： H03H9/64
CPC分类号： H03H9/6403
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公开(公告)号：EP0064382A2
公开(公告)日：1982-11-10
申请号：EP82302165.4
申请日：1982-04-27
申请人： FUJITSU LIMITED
IPC分类号： H03H9/64
CPC分类号： H03H9/72 , H03H9/02968 , H03H9/6403 , H03H9/643 , H03H9/76
摘要： A surface acoustic wave filter comprises: a substrate of piezoelectric material; a multistrip coupler comprising a plurality of parallel conductive strips formed on said substrate; at least one input transducer disposed on one side of said multistrip coupler; and at least one output transducer disposed on the other side of said multistrip coupler. A part of the middie portion of each of said conductive strips of said multistrip coupler is made of a photo-conductive material. This can provide a switchable or adjustable surface acoustic wave filter.
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48.发明授权
公开(公告)号：EP0007276B1
公开(公告)日：1982-09-15
申请号：EP79400481.2
申请日：1979-07-10
申请人： THOMSON-CSF
发明人： Laurent, Pierre
CPC分类号： H03H9/6403 , H03H9/0296 , H04L27/148
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