发明名称 |
SAW FILTER WITH IMPROVED STOP BAND SUPPRESSION |
摘要 |
A filter working with surface acoustic waves comprises a piezoelectric substrate (SU), a first transducer (IDT1) arranged in the acoustic track coupled to an input, having a first mean finger period (pi) assigned to a centre frequency of a pass band of the filter and a second transducer (IDT2) arranged in the acoustic track coupled to an output, having the same first mean finger period (p1), and a reflector arranged between first and second transducer having a second mean finger period (p2) assigned to a stop band frequency different from the centre frequency. Further, a new type of very broad bandwidth filters with small insertion loss and high return loss and high rejection are given that use a substrate that can propagate a PSAW and comprises fan shaped transducers. |
申请公布号 |
US2015244348(A1) |
申请公布日期 |
2015.08.27 |
申请号 |
US201214405392 |
申请日期 |
2012.06.05 |
申请人 |
Damy Jacques Antoine;Waterkeyn Christian;Emrich Holger |
发明人 |
Damy Jacques Antoine;Waterkeyn Christian;Emrich Holger |
分类号 |
H03H9/64 |
主分类号 |
H03H9/64 |
代理机构 |
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代理人 |
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主权项 |
1. A filter working with surface acoustic waves comprising
a piezoelectric substrate (SU) providing an acoustic track on the surface of the substrate a first transducer (IDT1) arranged in the acoustic track coupled to an input, having a first mean finger period (p1) assigned to a centre frequency of a pass band of the filter a second transducer (IDT2) arranged in the acoustic track coupled to an output, having the same first mean finger period (p1) a reflector arranged between first and second transducer having a second mean finger period (p2)assigned to a stop band frequency different from the centre frequency. |
地址 |
Nice FR |