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    • 6. 发明申请
    • FILTER STRUCTURE
    • 过滤器结构
    • WO2003098802A1
    • 2003-11-27
    • PCT/IB2003/001896
    • 2003-05-16
    • PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBHKONINKLIJKE PHILIPS ELECTRONICS N.V.MILSOM, Robert, FrederickLÖBL, Hans, Peter
    • MILSOM, Robert, FrederickLÖBL, Hans, Peter
    • H03H9/58
    • H03H9/0095
    • A filter structure, comprising a first signal line, a second signal line, a third signal line and a fourth signal line, said first and third signal lines defining an input port and said second and fourth signal lines defining an output port of a section of said filter structure, said section being defined by a first bulk acoustic wave resonator (A) which is connected between said first signal line and said second signal line, a second bulk acoustic wave resonator (G) which is connected between said third signal line and said fourth signal line, a third bulk acoustic wave resonator (C) which is connected between said first signal line and said fourth signal line, and a fourth bulk acoustic wave resonator (E) which is connected between said second signal line and said third signal line; is characterized in that a frequency pulling factor defined d of at least one of said acoustic wave resonators is non-zero, said frequency pulling factor d being defined by for first and second bulk acoustic wave resonators having a resonant frequency fr1, and for third and fourth bulk acoustic wave resonators having an anti-resonant frequency fa2, f0 being the centre frequency of the filter structure and k the coupling factor of respective resonators.
    • 一种滤波器结构,包括第一信号线,第二信号线,第三信号线和第四信号线,所述第一和第三信号线限定输入端口,所述第二和第四信号线限定一部分的输出端口 所述滤波器结构,所述部分由连接在所述第一信号线和所述第二信号线之间的第一体声波谐振器(A)限定,第二体声波谐振器(G)连接在所述第三信号线和 所述第四信号线,连接在所述第一信号线和所述第四信号线之间的第三体声波谐振器(C)和连接在所述第二信号线和所述第三信号线之间的第四体声波谐振器(E) 线; 其特征在于,所述声波谐振器中的至少一个定义为d的频率牵引因子不为零,所述频率拉伸系数d由具有共振频率fr1的第一和第二体声波谐振器定义,并且对于第三和 具有反谐振频率fa2的第四体声波谐振器,f0是滤波器结构的中心频率,k是各谐振器的耦合系数。