Invention Grant
- Patent Title: Ladder filter, duplexer and module
- Patent Title (中): 梯形过滤器，双工器和模块
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Application No.: US13454940Application Date: 2012-04-24
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Publication No.: US09035722B2Publication Date: 2015-05-19
- Inventor: Motoaki Hara , Shogo Inoue , Jun Tsutsumi , Masafumi Iwaki
- Applicant: Motoaki Hara , Shogo Inoue , Jun Tsutsumi , Masafumi Iwaki
- Applicant Address: JP Tokyo
- Assignee: TAIYO YUDEN CO., LTD.
- Current Assignee: TAIYO YUDEN CO., LTD.
- Current Assignee Address: JP Tokyo
- Agency: Chen Yoshimura LLP
- Priority: JP2011-100193 20110427
- Main IPC: H03H9/64
- IPC: H03H9/64 ; H03H9/54 ; H03H9/72 ; H03H9/00 ; H03H9/05
Abstract:
A ladder filter includes at least one series resonator connected in series between an input terminal and an output terminal, at least one parallel resonator connected in parallel with the at least one series resonator, an additional resonator connected in series between the at least one series resonator and one of the input terminal and the output terminal, and an inductor connected in series to the additional resonator, the additional resonator having a resonance frequency higher than an anti-resonance frequency of the at least one series resonator.
Public/Granted literature
- US20120274416A1 LADDER FILTER, DUPLEXER AND MODULE Public/Granted day:2012-11-01
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