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Patent Searching and Data


Title:
ACOUSTIC WAVE FILTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/208856
Kind Code:
A1
Abstract:
Provided is an acoustic wave filter device having improved isolation characteristics. In an acoustic wave filter device 1, a first filter 5 which has a first passband and includes a vertically coupled resonator-type acoustic wave filter 11 and at least one of series-arm resonators S1, S2 and a parallel-arm resonator P1, and a second filter 6 which has a second passband located in a frequency region lower than the first passband are commonly connected at one end side thereof. An inductor L2 is provided between a ground terminal 12 and a part of the vertically coupled resonator-type acoustic wave filter 11 that is to be connected to a ground potential.

Inventors:
MATSUDA, Ichiro (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
Application Number:
JP2017/018834
Publication Date:
December 07, 2017
Filing Date:
May 19, 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:
H03H9/72; H03H9/145; H03H9/25; H03H9/64
Domestic Patent References:
2016-01-28
2012-12-13
Foreign References:
JP2008271230A2008-11-06
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (Chuo Odori FN Bldg, 3-8 Tokiwamachi 1-chome, Chuo-ku, Osaka-sh, Osaka 28, 〒5400028, JP)
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