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    • 5. 发明申请
    • SURFACE ACOUSTIC WAVES FILTERS WITH OPTIMISED SYMMETRY
    • 表面声波滤波器与优化对称
    • WO02047264A1
    • 2002-06-13
    • PCT/FR2001/003885
    • 2001-12-07
    • H03H9/00H03H9/02H03H9/64
    • H03H9/6436H03H9/0057H03H9/02874H03H9/14588H03H9/6469
    • The invention concerns a surface acoustic wave filter comprising at least an i cascaded input acoustic path (VAi) to an i + 1 output acoustic path (VAi + 1), each acoustic path comprising interdigital electrode transducers and in particular: at least a central transducer (TCi); at least a pair of coupling transducers consisting of a first lateral transducer (T1Li) and a second lateral transducer (T2Li). The invention is characterised in that it comprises a first electrical connection with a first potential (V1) connecting the first lateral transducer (T1Li) of the i acoustic path and a second electrical connection to a second potential (V2) connecting the second lateral transducer of the (i + 1) acoustic path (T2Li+1) and the potentials are out of phase. The central transducer of the i acoustic path being connected to at least an input voltage (ViN). The central transducer of the i + 1 acoustic path being connected to at least an output voltage (Vout). Said filter structure enables to reduce cross couplings and to obtain in differential structures very good symmetry, in the field of double mode filters.
    • 本发明涉及一种包括至少一个i + 1个输出声学路径(VAi + 1)的级联输入声学路径(VAi)的表面声波滤波器,每个声学路径包括叉指式电极换能器,特别是:至少 中心传感器(TCi); 至少一对由第一横向换能器(T1Li)和第二横向换能器(T2Li)组成的耦合换能器。 本发明的特征在于,其包括具有连接第i个声学路径的第一横向换能器(T1Li)的第一电位(V1)和与第二电位(V2)连接的第二电连接(V2)的第一电连接, (i + 1)声道(T2Li + 1)的横向换能器和电位异相。 第i个声学路径的中心传感器连接至少一个输入电压(ViN)。 i + 1声道的中心传感器至少连接到输出电压(Vout)。 所述过滤器结构能够在双模式滤波器领域中减少交叉耦合并且在差分结构中获得非常好的对称性。
    • 8. 发明申请
    • バランス型弾性波フィルタ装置
    • 平衡声波滤波器
    • WO2008038498A1
    • 2008-04-03
    • PCT/JP2007/067185
    • 2007-09-04
    • 株式会社村田製作所春田 一政
    • 春田 一政
    • H03H9/64H03H9/145
    • H03H9/0042H03H9/0222H03H9/02874H03H9/02913H03H9/02992H03H9/059
    •  平衡度が改善されたバランス型弾性波フィルタ装置を提供する。  圧電体2上に縦結合共振子型弾性波フィルタ部18が形成されており、不平衡端子11と第1,第2の平衡端子12,13と、不平衡端子11と縦結合共振子型弾性波フィルタ部18とを接続している入力信号ライン31とを有し、入力信号ライン31と、第2の平衡端子13との間に入力信号ライン31と第2の平衡端子13とを分離するように、アース電位に接続されているシールドパターン32が設けられている、バランス型弾性波フィルタ装置1。
    • 提供了具有改进的平衡的平衡声波滤波器装置。 具有形成在压电体(2)上的纵向耦合的谐振器型声波滤波器(18)的平衡声波滤波器装置(1)包括不平衡端子(11),第一和第二平衡端子(12,13) 连接不平衡端子(11)和纵向耦合的谐振器型声波滤波器(18)的输入信号线(31)。 所述平衡声波滤波器装置还包括连接到地电位并设置在输入信号线(31)和第二平衡端子(13)之间的屏蔽图案(32),以便将输入信号线(31)从第二 平衡端子(13)。
    • 10. 发明申请
    • SURFACE-WAVE ACOUSTIC FILTER
    • 表面声波滤波器
    • WO99049573A1
    • 1999-09-30
    • PCT/DE1999/000843
    • 1999-03-22
    • H03H9/145H03H9/00H03H9/02H03H9/64
    • H03H9/6479H03H9/0038H03H9/02716H03H9/02795H03H9/02874H03H9/14588H03H9/6453H03H9/6463
    • The present invention relates to a surface-wave acoustic filter having a capacitive and inductive cross-talk which is compensated between adjacent and interdigitated input and output transformers. These transformers (20; 23) are divided into partial transformers (d, d'; e, e') and the guidance of their pads (24, 25; 26, 27) is modified so that the magnetic couplings between adjacent partial transformers have opposite flow directions (H, H') and so that the total magnetic flow induced is equal to zero. The partial transformers are mounted in series or in parallel so that during a symmetrical operation, the cross-talk capacities between adjacent pads and transformer surfaces are compensated at the corresponding gate.
    • 表面与补偿电容和相邻的IDT的输入和输出换能器之间的电感串话,其中,所述换能器(20; 23)声波滤波器成部分换能器(D,D“ E,E”)被分解并引导其焊盘(24,25 ; 26,27)被修改,使得流动方向(H,H“)被引导相对的相邻的子转换器之间的磁耦合,使得感应的磁通量之和为零,并且其中所述局部转换器串联连接或并联 使得对于对称操作时,相邻的焊盘和振子表面之间的串扰的电容匹配于相应的目标。