Title:
HIGH-FREQUENCY FILTER CIRCUIT, MULTIPLEXER, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/016279
Kind Code:
A1
Abstract:
A filter (11) has a serial arm circuit (10) connected between an input/output terminal (11m) and an input/output terminal (11n), and a parallel arm circuit (20) connected between ground and a path linking the input/output terminal (11m) and the input/output terminal (11n). One of the serial arm circuit (10) and the parallel arm circuit (20) is configured from a parallel arm resonator (p1) and a parallel arm resonator (p2) that are connected in parallel to each other and connected to a node (x1) of the path, the parallel arm resonators (p1) and (p2) forming a pass band together with the other of the serial arm circuit (10) and the parallel arm circuit (20), and the parallel arm resonator (p2) having a resonance frequency lower than that of the parallel arm resonator (p1) and having a higher impedance than does the parallel arm resonator (p1).
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Inventors:
HORITA ATSUSHI (JP)
NOSAKA KOJI (JP)
NOSAKA KOJI (JP)
Application Number:
PCT/JP2017/023707
Publication Date:
January 25, 2018
Filing Date:
June 28, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H9/145; H03H9/72
Domestic Patent References:
| WO2009025055A1 | 2009-02-26 | |||
| WO2013027580A1 | 2013-02-28 |
Foreign References:
| JPH11312951A | 1999-11-09 | |||
| JP2016054374A | 2016-04-14 | |||
| JP2000323961A | 2000-11-24 | |||
| JP2000077972A | 2000-03-14 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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