Title:
COMPOSITE ELASTIC WAVE FILTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/044810
Kind Code:
A1
Abstract:
Provided is a composite elastic wave filter device that can expand the attenuation amount of the low frequency side in an elastic wave filter having a frequency range with a high passband, and that can improve isolation characteristics. In this composite elastic wave filter device 1, one end of a first elastic wave filter 11 in a frequency range having a relatively low passband, and of a second elastic wave filter 12 in a frequency range having a relatively high passband are connected in common to each other, a first end part of a first parallel capacitive element C1 and a third end part of a second parallel capacitive element C2 are connected to a signal line 12a of the second elastic wave filter 12, a ground side end part of the first parallel capacitive element C1 is in common connection with a ground side end part of the first elastic wave filter 11, and a fourth end part of the second parallel capacitive element C2 is connected to ground potential.
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Inventors:
NAKAMURA SHINICHI (JP)
Application Number:
PCT/JP2021/029638
Publication Date:
March 03, 2022
Filing Date:
August 11, 2021
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H9/72
Domestic Patent References:
| WO2014167752A1 | 2014-10-16 | |||
| WO2015040922A1 | 2015-03-26 |
Foreign References:
| JP2010239612A | 2010-10-21 |
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (JP)
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