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公开(公告)号：US07420440B2
公开(公告)日：2008-09-02
申请号：US10983788
申请日：2004-11-09
CPC分类号： H03H9/6483 , B05D1/60 , B05D3/061 , C23C16/45504 , C23C16/45591 , C23C16/482
摘要： A surface acoustic wave filter includes an antenna terminal, a transmitting filter and a variable branching line both of which are coupled to the antenna terminal and a receiving filter coupled to the variable branching line. The transmitting filter has a first end series-arm SAW resonator, a second end series-arm SAW resonator, a middle series-arm SAW resonator coupled between the first and second end series-arm SAW resonators and parallel-arm SAW resonators. Each of the first and second end series-arm SAW resonator has a first resonance frequency. The middle series-arm SAW resonator has a second resonance frequency that is higher than the first resonance frequency.
摘要翻译： 表面声波滤波器包括天线端子，发射滤波器和可变分支线，两者都耦合到天线端子和耦合到可变分支线的接收滤波器。 发射滤波器具有第一端串联臂SAW谐振器，第二端串联臂SAW谐振器，耦合在第一和第二端串联SAW谐振器和并联SAW谐振器之间的中间串联SAW谐振器。 第一和第二端串联SAW谐振器中的每一个具有第一谐振频率。 中间串联SAW谐振器具有高于第一谐振频率的第二谐振频率。
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12.发明授权Acoustic wave branching filter having transmitting filter with optimal power handling 有权具有发射滤波器的声波分波器具有最佳的功率处理能力公开(公告)号：US06911878B2
公开(公告)日：2005-06-28
申请号：US10273887
申请日：2002-10-21
IPC分类号： H03H9/72 , B05D3/06 , B05D7/24 , C23C16/44 , C23C16/455 , C23C16/48 , H03H9/64 , H03M9/64 , H03M9/72
CPC分类号： H03H9/6483 , B05D1/60 , B05D3/061 , C23C16/45504 , C23C16/45591 , C23C16/482
摘要： A surface acoustic wave filter includes an antenna terminal, a transmitting filter and a variable branching line both of which are coupled to the antenna terminal and a receiving filter coupled to the variable branching line. The transmitting filter has a first end series-arm SAW resonator, a second end series-arm SAW resonator, a middle series-arm SAW resonator coupled between the first and second end series-arm SAW resonators and parallel-arm SAW resonators. Each of the first and second end series-arm SAW resonator has a first resonance frequency. The middle series-arm SAW resonator has a second resonance frequency that is higher than the first resonance frequency.
摘要翻译： 表面声波滤波器包括天线端子，发射滤波器和可变分支线，两者都耦合到天线端子和耦合到可变分支线的接收滤波器。 发射滤波器具有第一端串联臂SAW谐振器，第二端串联臂SAW谐振器，耦合在第一和第二端串联SAW谐振器和并联SAW谐振器之间的中间串联SAW谐振器。 第一和第二端串联SAW谐振器中的每一个具有第一谐振频率。 中间串联SAW谐振器具有高于第一谐振频率的第二谐振频率。
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13.发明授权Surface acoustic wave duplexer and portable communication device using the same 有权表面声波双工器和便携式通信设备使用相同公开(公告)号：US06765456B2
公开(公告)日：2004-07-20
申请号：US10015606
申请日：2001-12-17
IPC分类号： H03H972
CPC分类号： H03H9/72 , H03H7/19 , H03H9/0576 , H03H9/725
摘要： A surface acoustic wave duplexer includes a piezoelectric substrate; a transmitting filter formed on the piezoelectric substrate; a receiving filter formed on the piezoelectric substrate; a transmitting (Tx) branching line formed on the piezoelectric substrate; and a receiving (Rx) branching line formed on the piezoelectric substrate.
摘要翻译： 表面声波双工器包括压电基片; 形成在所述压电基板上的发送滤波器; 形成在所述压电基板上的接收滤波器; 形成在所述压电基板上的发送（Tx）分支线; 以及形成在压电基板上的接收（Rx）分支线。
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公开(公告)号：US5905418A
公开(公告)日：1999-05-18
申请号：US993580
申请日：1997-12-18
CPC分类号： H03H9/725 , H03H9/0576 , H03H9/6483 , H03H9/72 , H03H7/0115 , H03H7/1708 , H03H7/1725 , H03H7/175 , H03H7/1758 , H03H7/1766 , H03H7/1775 , H03H7/1783 , H03H7/1791 , H03H7/38
摘要： A surface-acoustic-wave filter couples a two-port surface-acoustic-wave resonator filter circuit coupled in parallel or in series with a two-port impedance circuit. The two-port impedance circuit has an impedance that creates a pole of attenuation, by making the open-circuit impedance of the surface-acoustic-wave filter equal to the short-circuit impedance. High attenuation over a wide range of stopband frequencies is obtained in this way, combined with steep roll-off between the passband and stopband.
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