Title:
FILTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2024/075517
Kind Code:
A1
Abstract:
Provided is a filter device that can suppress an increase in insertion loss. This filter device comprises: a first piezoelectric substrate 2A that has a first main surface 2a and a second main surface 2b opposed to each other; one or more first elastic wave resonators 13A that each include a function electrode provided on the first main surface 2a of the first piezoelectric substrate 2A and that are series-arm resonators or parallel-arm resonators; a supporter 8A that is provided on the first main surface 2a of the first piezoelectric substrate 2A and that surrounds the first elastic wave resonators 13A; a second piezoelectric substrate 2B that is provided on the supporter 8A and that has a third main surface 2c positioned on the first piezoelectric substrate 2A side and a fourth main surface 2d opposed to the third main surface 2c; one or more second elastic wave resonators 13B each of which includes a function electrode provided on the third main surface 2c of the second piezoelectric substrate 2B and at least one of which is a parallel-arm resonator; and an external connection terminal 11 that is provided in the second piezoelectric substrate 2B. A space surrounded by the first piezoelectric substrate 2A, the second piezoelectric substrate 2B, and the supporter 8A is configured. The first elastic wave resonators 13A and the second elastic wave resonators 13B are positioned in the space. The one or more second elastic wave resonators 13B include a parallel-arm resonator having the highest resonance frequency among all of the parallel-arm resonators configured on the first piezoelectric substrate 2A and the second piezoelectric substrate 2B.
Inventors:
YAMAZAKI SUNAO (JP)
SHIMIZU YASUHIRO (JP)
SHIMIZU YASUHIRO (JP)
Application Number:
PCT/JP2023/033945
Publication Date:
April 11, 2024
Filing Date:
September 19, 2023
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H9/25; H03H9/72
Domestic Patent References:
| WO2013128636A1 | 2013-09-06 |
Foreign References:
| JP2017204743A | 2017-11-16 | |||
| JP2020155967A | 2020-09-24 |
Attorney, Agent or Firm:
OSAKA FRONT (JP)
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