发明申请
- 专利标题： ACOUSTIC WAVE FILTER, DUPLEXER, COMMUNICATION MODULE, AND COMMUNICATION APPARATUS
- 专利标题（中）： 声波滤波器，双工器，通信模块和通信设备
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申请号： US12576576申请日： 2009-10-09
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公开(公告)号： US20100109801A1公开(公告)日： 2010-05-06
- 发明人: Shogo Inoue , Michio Miura , Takashi Matsuda
- 申请人： Shogo Inoue , Michio Miura , Takashi Matsuda
- 申请人地址： JP Kawasaki
- 专利权人： FUJITSU LIMITED
- 当前专利权人： FUJITSU LIMITED
- 当前专利权人地址： JP Kawasaki
- 优先权： JP2008-281959 20081031
- 主分类号： H03H9/00
- IPC分类号： H03H9/00
摘要：
In an acoustic wave filter, a notch resonator is connected in series (or parallel) with a plurality of acoustic wave resonators connected in a ladder shape. The notch resonator has a main resonant frequency that is substantially equal to a sub-resonant frequency of the acoustic wave resonators. With this configuration, the occurrence of sub-resonant responses in filter characteristics can be suppressed, resulting in an improvement in communication characteristics.
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