Title:
ELASTIC WAVE FILTER AND MULTIPLEXER
Document Type and Number:
WIPO Patent Application WO/2022/014332
Kind Code:
A1
Abstract:
An elastic wave filter (1) comprises a first filter circuit (10) disposed on a first path (r1) connecting a first signal terminal (T1) and a second signal terminal (T2), and an additional circuit (20) having an elastic wave resonator group (25) and connected to a plurality of nodes on the first path (r1). The elastic wave resonator group (25) includes a plurality of IDT electrodes (31, 32) disposed along an elastic wave propagating direction (D1). The plurality of IDT electrodes (31, 32) include a plurality of first interdigitated electrodes (31a, 32a) and a plurality of second interdigitated electrodes (31b, 32b). The plurality of first interdigitated electrodes (31a, 32a) are electrically connected to the plurality of nodes. Among the plurality of second interdigitated electrodes (31b, 32b), some second interdigitated electrodes are connected to ground, and other second interdigitated electrodes different than the some second interdigitated electrodes are left open without being connected to ground.
Inventors:
NAKAMURA SHINICHI (JP)
Application Number:
PCT/JP2021/024754
Publication Date:
January 20, 2022
Filing Date:
June 30, 2021
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H9/145; H03H9/72
Domestic Patent References:
| WO2020031783A1 | 2020-02-13 |
Foreign References:
| US20200144982A1 | 2020-05-07 | |||
| JP2017092945A | 2017-05-25 | |||
| JP2013118611A | 2013-06-13 | |||
| JP2008283425A | 2008-11-20 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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