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Title:
ACOUSTIC WAVE FILTER DEVICE, HIGH-FREQUENCY FRONT-END CIRCUIT, AND COMMUNICATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2018/043606
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 (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 resonator (p1) and the parallel arm resonator (p2) each comprise an acoustic wave resonator having an IDT electrode; and the IDT electrode (131) in the parallel arm resonator (p2) has a smaller aspect ratio, which is the ratio of a crossing width of multiple electrode fingers with respect to a logarithm of the multiple electrode fingers, than that of the IDT electrode (121) in the parallel arm resonator (p1).

Inventors:
NOSAKA, Koji (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
Application Number:
JP2017/031266
Publication Date:
March 08, 2018
Filing Date:
August 30, 2017
Export Citation:
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Assignee:
MURATA MANUFACTURING CO., LTD. (10-1, Higashikotari 1-chome Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
International Classes:
H03H9/64; H03H7/01; H03H9/145
Domestic Patent References:
WO2016031391A12016-03-03
WO2016088680A12016-06-09
WO2016013330A12016-01-28
WO2010103882A12010-09-16
WO2010004686A12010-01-14
Foreign References:
JP2000323961A2000-11-24
JP2009207116A2009-09-10
JP2012060422A2012-03-22
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (6F Tanaka Ito Pia Shin-Osaka Bldg., 3-10, Nishi Nakajima 5-chome, Yodogawa-ku, Osaka-cit, Osaka 11, 〒5320011, JP)
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