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    • 54. 发明公开
    • FILTER DEVICE
    • 过滤设备
    • EP2913923A1
    • 2015-09-02
    • EP13848772.3
    • 2013-08-08
    • Murata Manufacturing Co., Ltd.
    • NOSAKA, Koji
    • H03H7/075H03H7/09H03H9/64
    • H03H9/542H03H7/09H03H7/1775H03H9/6423H03H9/6483
    • Provided is a filter device capable of widening a band and increasing attenuation in an attenuation band separated from the pass band. A filter device (1) includes a first LC parallel resonance circuit (7) having a first inductance and connected between a line connecting an input terminal (2) and an output terminal (3) and a ground potential, a second LC parallel resonance circuit (9) having a second inductance and connected between the line and the ground potential, and at least one elastic wave resonator (21) that is connected between an end portion of the first LC parallel resonance circuit (7) and an end portion of the second LC parallel resonance circuit (9). In the filter device (1), attenuation-frequency characteristics of an LC filter using the first LC parallel resonance circuit (7), the second LC parallel resonance circuit (9), and a capacitive property of the at least one elastic wave resonator (21) and attenuation-frequency characteristics of the elastic wave resonator are used.
    • 提供一种滤波器装置,其能够扩大频带并增加与通带分离的衰减频带中的衰减。 滤波器装置(1)包括:第一LC并联谐振电路(7),其具有第一电感并连接在连接输入端子(2)和输出端子(3)的线与接地电位之间;第二LC并联谐振电路 (9),其具有第二电感并连接在所述线与所述接地电位之间;以及至少一个弹性波谐振器(21),其连接在所述第一LC并联谐振电路(7)的端部与所述第一LC并联谐振电路 第二LC并联谐振电路(9)。 在滤波装置(1)中,使用第一LC并联谐振电路(7),第二LC并联谐振电路(9)以及至少一个弹性波谐振器(9)的电容特性的LC滤波器的衰减频率特性 21)和弹性波谐振器的衰减频率特性。