Title:
ACOUSTIC WAVE FILTER DEVICE, HIGH-FREQUENCY FRONT-END CIRCUIT, AND COMMUNICATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2018/043607
Kind Code:
A1
Abstract:
A filter (10) has a serial arm resonator (s1) connected to a path connecting an input-output terminal (11m) and an input-output terminal (11n), and has parallel arm resonators (p1, p2) that are connected between the same node (x1) on said path and ground, wherein: the parallel arm resonator (p2) has a resonant frequency higher than that of the parallel arm resonator (p1); the parallel arm resonator (p2) has an anti-resonance frequency higher than that of the parallel arm resonator (p1); the parallel arm resonators (p1, p2) each comprise an acoustic wave resonator having an IDT electrode; and the IDT electrode (131) in the parallel arm resonator (p2) has a greater duty ratio, which is the ratio of the width of multiple electrode fingers with respect to the pitch of the multiple electrode fingers, than that of the IDT electrode (121) in the parallel arm resonator (p1).
Inventors:
NOSAKA KOJI (JP)
Application Number:
PCT/JP2017/031267
Publication Date:
March 08, 2018
Filing Date:
August 30, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H9/145
Domestic Patent References:
| WO2016027707A1 | 2016-02-25 | |||
| WO2006067935A1 | 2006-06-29 | |||
| WO2005011117A1 | 2005-02-03 | |||
| WO2016031391A1 | 2016-03-03 | |||
| WO2016013330A1 | 2016-01-28 |
Foreign References:
| JP2014068123A | 2014-04-17 | |||
| JP2008131128A | 2008-06-05 | |||
| JP2012060422A | 2012-03-22 | |||
| JP2000323961A | 2000-11-24 | |||
| JP2009207116A | 2009-09-10 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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