Title:
RECEPTION FILTER AND COMPOSITE FILTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/002948
Kind Code:
A1
Abstract:
A reception filter in which a longitudinally coupled elastic wave filter is less likely to be damaged is provided. A reception filter 1 comprises an input terminal 2A and an output terminal 2B, and a longitudinally coupled elastic wave filter 3 including a plurality of three or more IDT electrodes (first to third IDT electrodes 6 to 8) each connected to one of the input terminal 2A and the output terminal 2B. At least one of the plurality of IDT electrodes is connected to the input terminal 2A. At least one of the plurality of IDT electrodes is connected to the output terminal 2B. A mean duty ratio of the first IDT electrode 6 connected to the input terminal 2A and a mean duty ratio of the third IDT electrode 8 are smaller than a mean duty ratio of the second IDT electrode 7 connected to the output terminal 2B.
Inventors:
SHODA CHIHIRO (JP)
Application Number:
PCT/JP2022/027874
Publication Date:
January 26, 2023
Filing Date:
July 15, 2022
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H9/145; H03H9/72
Domestic Patent References:
| WO2015198904A1 | 2015-12-30 |
Foreign References:
| JP2003069384A | 2003-03-07 | |||
| JP2008252678A | 2008-10-16 | |||
| JP2015119258A | 2015-06-25 | |||
| JP2019220877A | 2019-12-26 | |||
| JP2004112591A | 2004-04-08 |
Attorney, Agent or Firm:
OSAKA FRONT (JP)
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