Title:
ELASTIC WAVE FILTER, BRANCHING FILTER, AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/010245
Kind Code:
A1
Abstract:
A filter body comprises: a series arm including a plurality of series resonators connected in series with each other; and one or more parallel resonators, the series arm and the one or more parallel resonators being connected in a ladder form. The series arm has a fold-back portion, and a series resonator located closest to a first terminal from a circuit viewpoint among the plurality of series resonators, and a parallel resonator located closest to the first terminal from a circuit viewpoint among the plurality of parallel resonators do not overlap a series resonator located closest to a second terminal from a circuit viewpoint among the plurality of series resonators, and a parallel resonator located closest to the second terminal from a circuit viewpoint among the plurality of parallel resonators when viewed in the propagation direction of an elastic wave.
Inventors:
TANAKA HIROYUKI (JP)
Application Number:
PCT/JP2020/026656
Publication Date:
January 21, 2021
Filing Date:
July 08, 2020
Export Citation:
Assignee:
KYOCERA CORP (JP)
International Classes:
H03H9/64; H03H9/72
Domestic Patent References:
| WO1999060700A1 | 1999-11-25 | |||
| WO2018021242A1 | 2018-02-01 |
Foreign References:
| JPH09505974A | 1997-06-10 | |||
| JP2019021997A | 2019-02-07 |
Attorney, Agent or Firm:
IIJIMA, YASUHIRO (JP)
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