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    • 6. 发明申请
    • LADDER FILTER, DUPLEXER AND MODULE
    • 梯子过滤器,双面器和模块
    • US20120286895A1
    • 2012-11-15
    • US13466319
    • 2012-05-08
    • Motoaki HARAShogo INOUEJun TSUTSUMIMasafumi IWAKI
    • Motoaki HARAShogo INOUEJun TSUTSUMIMasafumi IWAKI
    • H03H9/70H03H9/72
    • H03H9/0566H03H9/0023H03H9/1085H03H9/542H03H9/605H03H9/6483H03H9/725
    • A ladder filter includes at least one series resonator connected in series between an input terminal and an output terminal, at least one parallel resonator connected in parallel with the at least one series resonator, and an inductor connected in parallel with the at least one series resonator. The at least one series resonator and the inductor generate a first attenuation pole at a frequency equal to or lower than a frequency band defined by the at least one series resonator and the at least one parallel resonator. The first attenuation pole is located at a frequency that is equal to or higher than a resonance frequency of a parallel resonator that is included in the at least one parallel resonator and has a highest resonance frequency and that is equal to or lower than a high-frequency end of the pass band.
    • 梯形滤波器包括串联连接在输入端和输出端之间的至少一个串联谐振器,与至少一个串联谐振器并联连接的至少一个并联谐振器,以及与至少一个串联谐振器并联连接的电感器 。 所述至少一个串联谐振器和所述电感器以等于或低于由所述至少一个串联谐振器和所述至少一个并联谐振器限定的频带的频率产生第一衰减极点。 第一衰减极点位于等于或高于包括在至少一个并联谐振器中并具有最高谐振频率并且等于或低于高谐振频率的并联谐振器的谐振频率的频率, 通频带的频率端。
    • 7. 发明申请
    • FILTER AND DUPLEXER
    • 过滤器和双面器
    • US20120299664A1
    • 2012-11-29
    • US13477732
    • 2012-05-22
    • Motoaki HARAJun TSUTSUMI
    • Motoaki HARAJun TSUTSUMI
    • H03H9/70H03H9/58
    • H03H9/0211H03H9/02118H03H9/02157H03H9/171H03H9/706
    • A filter includes one or a plurality of parallel resonators coupled in parallel and one or a plurality of a film bulk acoustic resonators coupled in series, the film bulk acoustic resonator having a substrate, a lower electrode, a piezoelectric membrane, and an upper electrode, wherein: at least one of the lower electrode and the upper electrode has a thick membrane region having a thickness larger than that of a center portion of a resonance region at an edge of the resonance region, the resonance region being a region where the lower electrode and the upper electrode face with each other through the piezoelectric membrane; and a width of the thick membrane region is smaller than a wavelength of an acoustic wave propagating in a direction crossing a thickness direction of the piezoelectric membrane.
    • 滤波器包括并联耦合的一个或多个并联谐振器和串联耦合的一个或多个薄膜体声波谐振器,所述薄膜体声波谐振器具有基板,下电极,压电薄膜和上电极, 其中:所述下电极和所述上电极中的至少一个具有比所述谐振区域的边缘处的谐振区域的中心部分的厚度大的厚膜区域,所述谐振区域是所述下电极 并且上电极通过压电膜彼此面对; 并且所述厚膜区域的宽度小于在与所述压电膜的厚度方向交叉的方向上传播的声波的波长。