Title:
ラダー型フィルタ、デュプレクサ及び弾性波フィルタ装置
Document Type and Number:
Japanese Patent JP6798562
Kind Code:
B2
Abstract:
A ladder filter includes series-arm resonators each including an IDT electrode and a reflector, and a parallel-arm resonator. In at least one of the series-arm resonators, where a wavelength that is determined by an electrode finger pitch of the IDT electrode is λ, an electrode finger center-to-center distance between an electrode finger located closest to the reflector among electrode fingers of the IDT electrode and an electrode finger located closest to the IDT electrode among electrode fingers of the reflector is less than about 0.5λ, and an anti-resonant frequency of the at least one of the series-arm resonators is higher than an anti-resonant frequency of at least another one of the series-arm resonators.
Inventors:
Toshiaki Takada
Application Number:
JP2018547545A
Publication Date:
December 09, 2020
Filing Date:
October 12, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
H03H9/64; H03H9/145; H03H9/72
Domestic Patent References:
| JP2003087096A | ||||
| JP2009212572A | ||||
| JP2005191797A | ||||
| JP9055640A | ||||
| JP2014039199A |
Foreign References:
| WO2016017730A1 |
Attorney, Agent or Firm:
Patent business corporation Miya saki, table of contents patent office