发明授权
- 专利标题: SAW filter and electronic device including SAW filter
- 专利标题(中): SAW滤波器和包括SAW滤波器的电子器件
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申请号: US10634524申请日: 2003-08-05
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公开(公告)号: US06903631B2公开(公告)日: 2005-06-07
- 发明人: Hiroshi Kushitani , Shunichi Seki
- 申请人: Hiroshi Kushitani , Shunichi Seki
- 申请人地址: JP Osaka
- 专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址: JP Osaka
- 代理机构: RatnerPrestia
- 优先权: JP2002-228868 20020806
- 主分类号: H03H9/64
- IPC分类号: H03H9/64 ; H03H9/05 ; H03H9/25 ; H03H9/72
摘要:
A surface acoustic wave (SAW) filter includes an input terminal, an output terminal, a series resonator provided between the input terminal and the output terminal, first and second parallel resonators having respective one ports connected to respective ports of the series resonator, respectively, first and second nodes connected to respective other ports of the first and second parallel resonators, respectively, first and second inductance elements having respective one ends connected to the first and second nodes, respectively, a third node connected to respective other ends of the first and second inductance elements, a third inductance element having one end connected to the third node, a grounding terminal connected to other end of the third inductance element, and a capacitance element connected between the first and second nodes. The SAW filter has a large attenuation amount at a lower side of a pass band of the filter, thus having sufficient properties.
公开/授权文献
- US20040085161A1 SAW filter and electronic device including SAW filter 公开/授权日:2004-05-06
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