Title:
ELASTIC WAVE FILTER
Document Type and Number:
WIPO Patent Application WO/2022/059643
Kind Code:
A1
Abstract:
An elastic wave filter (1) that comprises: a first filter circuit (10) that has a pass band of a prescribed frequency band and is provided on a first pathway (r1) that connects a first signal terminal (T1) and a second signal terminal (T2); and a supplemental resonance circuit (20) that is connected in parallel with at least a portion of the first filter circuit (10). The supplemental resonance circuit (20) has an IDT electrode group (25) that comprises a plurality of IDT electrodes (31, 32) that are arranged along an elastic wave propagation direction (D1). At least one resonant frequency (f1) from among one or more resonant frequencies of the supplemental resonance circuit (20) is included in the pass band of the first filter circuit (10).
Inventors:
NOGUCHI AKIRA (JP)
Application Number:
PCT/JP2021/033530
Publication Date:
March 24, 2022
Filing Date:
September 13, 2021
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H9/72
Domestic Patent References:
| WO2020044979A1 | 2020-03-05 |
Foreign References:
| JP2014120841A | 2014-06-30 | |||
| JP2016220263A | 2016-12-22 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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