Title:
ELASTIC WAVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/163263
Kind Code:
A1
Abstract:
A multiplexer (10) includes filters (100, 200), a resin layer (60), and a conductor layer (70). The passband of the filter (200) is lower than the passband of the filter (100). The filter (100) is in contact with the conductor layer and the filter (200) is not in contact with the conductor layer. The filter (200) is a ladder-type filter. The thermal resistance value of the filter (200) is greater than that of the filter (100), and the passband thereof decreases with an increase in the temperature. A piezoelectric substrate of the filter (200) has a first region on the filter (100) side extending from the center of the piezoelectric substrate and a second region on the opposite side. A second area is larger than a first area, the first area and the second area being the areas of regions where an elastic wave resonator included in a parallel arm circuit is formed in the first region and the second region.
Inventors:
KAWASAKI KOICHIRO (JP)
Application Number:
PCT/JP2021/048243
Publication Date:
August 04, 2022
Filing Date:
December 24, 2021
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/25; H03H9/64; H03H9/72
Domestic Patent References:
| WO2008105199A1 | 2008-09-04 |
Foreign References:
| JP2019021904A | 2019-02-07 | |||
| JP2009296508A | 2009-12-17 |
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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