Title:
ELASTIC-WAVE FILTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/097201
Kind Code:
A1
Abstract:
An elastic-wave filter (10) is provided with: a serial arm resonator (12) provided in a path for connecting input and output terminals (110 and 120); a parallel arm resonator (21) provided in a path for connecting a node N1, which is in a path for connecting the serial arm resonator (12) to the input and output terminal (110), to the ground; and a parallel arm resonator (22) provided in a path for connecting a node N2, which is in a path for connecting the serial arm resonator (12) to the input and output terminal (120), to the ground. A resonant frequency frp21 of the parallel arm resonator (21) is lower than a resonant frequency frp22 of the parallel arm resonator (22), an antiresonant frequency fap21 of the parallel arm resonator (21) is higher than an antiresonant frequency fap22 of the parallel arm resonator (22), and a resonant frequency frs22 of the parallel arm resonator (22) is highest of all the parallel arm resonators.
Inventors:
MICHIGAMI AKIRA (JP)
Application Number:
PCT/JP2017/042077
Publication Date:
May 31, 2018
Filing Date:
November 22, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H9/145
Domestic Patent References:
WO2009119007A1 | 2009-10-01 | |||
WO2009133655A1 | 2009-11-05 |
Foreign References:
JP2008067289A | 2008-03-21 | |||
JP2005136588A | 2005-05-26 | |||
JP2015041909A | 2015-03-02 | |||
JPH08307199A | 1996-11-22 | |||
JP2001203556A | 2001-07-27 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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