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1.发明公开Surface-acoustic-wave filters with poles of attenuation created by impedance circuits 失效AkustischeOberflächenwellenfiltermit durch Impedanzschaltungen erzeugtenDämpfungspolen
公开(公告)号：EP1326333A2
公开(公告)日：2003-07-09
申请号：EP03003449.0
申请日：1997-11-28
Applicant: Oki Electric Industry Co., Ltd.
Inventor： Ehara, Hisanori , Noguchi, Kazushige , Shimamura, Hajime , Okada, Yoshio , Komazaki, Tomokazu
IPC: H03H9/64
CPC classification number: H03H9/725 , H03H7/0115 , H03H7/1708 , H03H7/1725 , H03H7/175 , H03H7/1758 , H03H7/1766 , H03H7/1775 , H03H7/1783 , H03H7/1791 , H03H7/38 , H03H9/0576 , H03H9/6483 , H03H9/72
Abstract: 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.
Abstract translation: 表面声波滤波器将与双端口阻抗电路并联或串联耦合的两端口声表面波谐振器滤波器电路耦合。 双端口阻抗电路具有通过使表面声波滤波器的开路阻抗等于短路阻抗而产生衰减极点的阻抗。 以这种方式获得宽范围的阻带频率的高衰减，并结合通带和阻带之间的陡峭滚降。
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Patent Agency Ranking2.发明授权Surface-acoustic-wave filters with poles of attenuation created by impedance circuits 失效通过阻抗电路产生的具有表面声波滤波器的衰减极
公开(公告)号：EP0862266B1
公开(公告)日：2003-05-21
申请号：EP97120976.2
申请日：1997-11-28
Applicant: Oki Electric Industry Co., Ltd.
Inventor： Ehara, Hisanori , Noguchi, Kazushige , Shimamura, Hajime , Okada, Yoshio , Komazaki, Tomokazu
IPC: H03H9/64
CPC classification number: H03H9/725 , H03H7/0115 , H03H7/1708 , H03H7/1725 , H03H7/175 , H03H7/1758 , H03H7/1766 , H03H7/1775 , H03H7/1783 , H03H7/1791 , H03H7/38 , H03H9/0576 , H03H9/6483 , H03H9/72
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3.发明授权Surface-acoustic-wave filters with poles of attenuation created by impedance circuits 失效通过阻抗电路产生的具有表面声波滤波器的衰减极
公开(公告)号：EP1326333B1
公开(公告)日：2008-08-20
申请号：EP03003449.0
申请日：1997-11-28
Applicant: Oki Electric Industry Co., Ltd.
Inventor： Ehara, Hisanori , Noguchi, Kazushige , Shimamura, Hajime , Okada, Yoshio , Komazaki, Tomokazu
IPC: H03H9/64
CPC classification number: H03H9/725 , H03H7/0115 , H03H7/1708 , H03H7/1725 , H03H7/175 , H03H7/1758 , H03H7/1766 , H03H7/1775 , H03H7/1783 , H03H7/1791 , H03H7/38 , H03H9/0576 , H03H9/6483 , H03H9/72
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4.发明公开Surface-acoustic-wave filters with poles of attenuation created by impedance circuits 失效通过阻抗电路产生的具有表面声波滤波器的衰减极
公开(公告)号：EP1326333A3
公开(公告)日：2007-10-17
申请号：EP03003449.0
申请日：1997-11-28
Applicant: Oki Electric Industry Co., Ltd.
Inventor： Ehara, Hisanori , Noguchi, Kazushige , Shimamura, Hajime , Okada, Yoshio , Komazaki, Tomokazu
IPC: H03H9/64
CPC classification number: H03H9/725 , H03H7/0115 , H03H7/1708 , H03H7/1725 , H03H7/175 , H03H7/1758 , H03H7/1766 , H03H7/1775 , H03H7/1783 , H03H7/1791 , H03H7/38 , H03H9/0576 , H03H9/6483 , H03H9/72
Abstract: 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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5.发明公开Surface-acoustic-wave filters with poles of attenuation created by impedance circuits 失效通过阻抗电路产生的具有表面声波滤波器的衰减极
公开(公告)号：EP0862266A3
公开(公告)日：1999-07-14
申请号：EP97120976.2
申请日：1997-11-28
Applicant: Oki Electric Industry Co., Ltd.
Inventor： Ehara, Hisanori , Noguchi, Kazushige , Shimamura, Hajime , Okada, Yoshio , Komazaki, Tomokazu
IPC: H03H9/64
CPC classification number: H03H9/725 , H03H7/0115 , H03H7/1708 , H03H7/1725 , H03H7/175 , H03H7/1758 , H03H7/1766 , H03H7/1775 , H03H7/1783 , H03H7/1791 , H03H7/38 , H03H9/0576 , H03H9/6483 , H03H9/72
Abstract: 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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6.发明公开Surface-acoustic-wave filters with poles of attenuation created by impedance circuits 失效AkustischeOberflächenwellenfiltermit erzeugtenDämpfungspolendurch Impedanzschaltungen
公开(公告)号：EP0862266A2
公开(公告)日：1998-09-02
申请号：EP97120976.2
申请日：1997-11-28
Applicant: Oki Electric Industry Co., Ltd.
Inventor： Ehara, Hisanori , Noguchi, Kazushige , Shimamura, Hajime , Okada, Yoshio , Komazaki, Tomokazu
IPC: H03H9/64
CPC classification number: H03H9/725 , H03H7/0115 , H03H7/1708 , H03H7/1725 , H03H7/175 , H03H7/1758 , H03H7/1766 , H03H7/1775 , H03H7/1783 , H03H7/1791 , H03H7/38 , H03H9/0576 , H03H9/6483 , H03H9/72
Abstract: 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.
Abstract translation: 表面声波滤波器将与双端口阻抗电路并联或串联耦合的两端口声表面波谐振器滤波器电路耦合。 双端口阻抗电路具有通过使表面声波滤波器的开路阻抗等于短路阻抗而产生衰减极点的阻抗。 以这种方式获得宽范围的阻带频率的高衰减，并结合通带和阻带之间的陡峭滚降。
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