Title:
ACOUSTIC WAVE FILTER
Document Type and Number:
WIPO Patent Application WO/2021/045031
Kind Code:
A1
Abstract:
An acoustic filter (1) is provided with a series arm resonator (s1 and s2) and a parallel arm resonator (p1 and p2), each formed from an acoustic resonator that has an IDT electrode, wherein: the IDT electrode has a pair of comb-shaped electrodes, each of which comprises a plurality of electrode fingers and a busbar electrode; and when an electrode finger among the plurality of electrode fingers that is not connected to either busbar electrode constituting the pair of comb-shaped electrodes is defined as a floating thinned-out electrode, and an electrode finger among the plurality of electrode fingers that is connected to the same busbar electrode as the electrode fingers on both sides of said electrode finger is defined as a polarity-reversed thinned-out electrode, the series arm resonator (s1) has the IDT electrode that includes the floating thinned-out electrode, and the parallel arm resonator (p1) has the IDT electrode that includes the polarity-reversed thinned-out electrode.
Inventors:
TAKEUCHI YUTA (JP)
Application Number:
PCT/JP2020/032999
Publication Date:
March 11, 2021
Filing Date:
September 01, 2020
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145; H03H9/64
Domestic Patent References:
| WO2019131530A1 | 2019-07-04 | |||
| WO2016121818A1 | 2016-08-04 | |||
| WO2018216417A1 | 2018-11-29 |
Foreign References:
| JP2004096796A | 2004-03-25 | |||
| JP2004023611A | 2004-01-22 | |||
| JP2000315931A | 2000-11-14 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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