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公开(公告)号：EP1400015A1
公开(公告)日：2004-03-24
申请号：EP02724063.9
申请日：2002-04-22
IPC分类号： H03H9/02
CPC分类号： H03H9/14505
摘要： A spatial harmonic transducer of a SAW device is made directional for SAWs at a spatial harmonic signal frequency of the transducer by a reflector for reflecting SAWs at that frequency. The transducer comprises repeated groups of consecutive electrodes having a predetermined polarity sequence, positioned to operate coherently for SAWs at the signal frequency. The reflector comprises reflector electrodes for producing constructive and destructive interference in opposite SAW directions, with electrode widths and spacings of at least a quarter wavelength at the signal frequency. A SAW device with two such spatial harmonic SPUDTs using different polarity sequences can provide desirable characteristics for filters and delay lines at frequencies of about 2GHz.
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公开(公告)号：EP1400015B1
公开(公告)日：2010-09-15
申请号：EP02724063.9
申请日：2002-04-22
IPC分类号： H03H9/02
CPC分类号： H03H9/14505
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公开(公告)号：EP1410501A2
公开(公告)日：2004-04-21
申请号：EP01953078.1
申请日：2001-07-19
IPC分类号： H03H9/00
CPC分类号： H03H9/6403 , H03H9/0042 , H03H9/02771 , H03H9/14505 , H03H9/14517 , H03H9/14558 , H03H9/643
摘要： A tapered IDT function is provided in an IDT of a SAW device having fingers substantially parallel to one another by applying a static electric field to a piezoelectric substrate of the SAW device to generate in the substrate a strain which varies across the aperture of the IDT, thereby varying a center frequency of the IDT across the aperture of the IDT. The electric field can be perpendicular to the fingers and created by applying a dc voltage between conductors at least one of which can be tapered or angled, either in the region of the IDT to produce a strain directly or adjacent to the IDT to produce a strain indirectly, or it can be parallel to the fingers, two fields with opposite directions being created at the two sides of the IDT.
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