Title:
ACOUSTIC WAVE FILTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/221548
Kind Code:
A1
Abstract:
This acoustic wave filter device (10) is provided with a transmission-side filter (20), a reception-side filter (30), an antenna terminal (Pant) and a matching circuit (40). The matching circuit (40) is connected between the antenna terminal (Pant) and a common connection point (50) of the transmission-side filter (20) and the reception-side filter (30). The transmission-side filter (20) is provided with a ladder type circuit (21) and a plurality of inductors (231, 241) for filters. The matching circuit (40) is provided with an inductor (41) for matching. The ladder type circuit (21) is provided with a plurality of series arm resonators (211, 212, 213, 214) and a plurality of parallel arm resonators (221, 222, 223, 224). The inductor (41) for matching is connected between a transmission line, which connects the common connection point (50) and the antenna terminal (Pant) to each other, and a parallel arm resonator (221)-side first terminal (2311) of the inductors (231) for filters.
Inventors:
GENJI TAKUMA (JP)
KANEDA AKIO (JP)
KANEDA AKIO (JP)
Application Number:
PCT/JP2017/016472
Publication Date:
December 28, 2017
Filing Date:
April 26, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/72; H03H9/64
Domestic Patent References:
| WO2016060151A1 | 2016-04-21 | |||
| WO2014034373A1 | 2014-03-06 |
Foreign References:
| JP2016012796A | 2016-01-21 | |||
| JP2015033080A | 2015-02-16 |
Attorney, Agent or Firm:
KAEDE PATENT ATTORNEYS' OFFICE (JP)
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