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 (JP)
Application Number:
PCT/JP2017/018834
Publication Date:
December 07, 2017
Filing Date:
May 19, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/72; H03H9/145; H03H9/25; H03H9/64
Domestic Patent References:
| WO2016013330A1 | 2016-01-28 | |||
| WO2012169231A1 | 2012-12-13 |
Foreign References:
| JP2008271230A | 2008-11-06 |
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (JP)
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