Title:
弾性波フィルタ装置、高周波フロントエンド回路及び通信装置
Document Type and Number:
Japanese Patent JP6741069
Kind Code:
B2
Abstract:
A filter includes a series-arm resonator connected on a path connecting an input/output terminal and an input/output terminal, and first and second parallel-arm resonators connected between the same node on the path and ground. A resonant frequency of the first parallel-arm resonator is lower than a resonant frequency of the second parallel-arm resonator, and an anti-resonant frequency of the first parallel-arm resonator is lower than an anti-resonant frequency of the second parallel-arm resonator. The first parallel-arm resonator is defined by an acoustic wave resonator, and includes an IDT electrode that excites an acoustic wave, and a reflector that reflects the acoustic wave excited by the IDT electrode. A pitch between the IDT electrode and the reflector is about 0.42λ or more and less than about 0.50λ.
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Inventors:
Koji Nosaka
Application Number:
JP2018537369A
Publication Date:
August 19, 2020
Filing Date:
August 30, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
H03H9/64; H03H9/145
Domestic Patent References:
| JP2014068123A | ||||
| JP2006013576A | ||||
| JP2009207116A | ||||
| JP201439199A |
Foreign References:
| WO2016017730A1 |
Attorney, Agent or Firm:
Shuichi Yoshikawa
Masao Sakajima
Masao Sakajima