Title:
ACOUSTIC WAVE FILTER DEVICE, HIGH-FREQUENCY FRONT-END CIRCUIT, AND COMMUNICATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2018/043610
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 a parallel arm resonator (p1) and a parallel arm resonator (p2) that are connected between the same node (x1) on said path and ground, wherein: the parallel arm resonator (p1) has a resonant frequency lower than that of the parallel arm resonator (p2); the parallel arm resonator (p1) has an anti-resonance frequency lower than that of the parallel arm resonator (p2); the parallel arm resonator (p1) is formed of an acoustic wave resonator and has an IDT electrode (121) for exciting acoustic waves and a reflector (122) for reflecting the acoustic waves excited by the IDT electrode (121); and, when the wavelength of an acoustic wave determined by an electrode cycle of the IDT electrode (121) is defined as λ, the pitch between the IDT electrode (121) and the reflector (122) is not less than 0.42λ but less than 0.50λ.
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Inventors:
NOSAKA KOJI (JP)
Application Number:
PCT/JP2017/031271
Publication Date:
March 08, 2018
Filing Date:
August 30, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H7/01; H03H9/145
Domestic Patent References:
| WO2016017730A1 | 2016-02-04 |
Foreign References:
| JP2014068123A | 2014-04-17 | |||
| JP2006013576A | 2006-01-12 | |||
| JP2009207116A | 2009-09-10 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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