发明公开
EP1863173A2 Filter having multiple piezoelectric thin-film resonators
审中-公开
过滤器mehreren piezoelektrischenDünnschichtresonatoren
- 专利标题: Filter having multiple piezoelectric thin-film resonators
- 专利标题(中): 过滤器mehreren piezoelektrischenDünnschichtresonatoren
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申请号: EP07109239.9申请日: 2007-05-30
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公开(公告)号: EP1863173A2公开(公告)日: 2007-12-05
- 发明人: Taniguchi, Shinji , Yokoyama, Tsuyoshi , Hara, Motoaki , Sakashita, Takeshi , Tsutsumi, Jun , Iwaki, Masafumi , Nishihara, Tokihiro , Ueda, Masanori , Ehara, Hisanori
- 申请人: Fujitsu Ltd.
- 申请人地址: 1-1, Kamikodanaka 4-chome, Nakahara-ku Kawasaki-shi, Kanagawa 211-8588 JP
- 专利权人: Fujitsu Ltd.
- 当前专利权人: Fujitsu Ltd.
- 当前专利权人地址: 1-1, Kamikodanaka 4-chome, Nakahara-ku Kawasaki-shi, Kanagawa 211-8588 JP
- 代理机构: Wilding, Frances Ward
- 优先权: JP2006151474 20060531
- 主分类号: H03H3/02
- IPC分类号: H03H3/02 ; H03H9/58 ; H03H9/02
摘要:
A filter includes multiple piezoelectric thin-film resonators (S11,S12,S13,S14,P11,P12,P13,P14) each having a substrate (11), a lower electrode (13) formed on the substrate (11), a piezoelectric film (14) formed on the lower electrode (13), and an upper electrode (15) provided on the piezoelectric film (14) so that the upper electrode (15) and the lower electrode (13) face each other across the piezoelectric film (14).
The piezoelectric thin-film resonator (S11,S12,S13,S14,P11,P12,P13,P14) are of two types:
a) a first type (S11,S14,P11,P14) where at least a part (28) of an outer curved portion of the piezoelectric film (14) is located further out than an outer curved portion (26) of a region (24) in which the upper electrode (15) and the lower electrode (13) face each other across the piezoelectric film (14); and
b) a second type (Sl2,S13,P12,P13) in which at least a part of an outer curved portion of the piezoelectric film (14) coincides with an outer curved portion (26) of a region (24) in which the upper electrode (15) and the lower electrode (13) face each other across the piezoelectric film (14) or is further inside the outer curved portion (26) of the region (24).
The piezoelectric thin-film resonator (S11,S12,S13,S14,P11,P12,P13,P14) are of two types:
a) a first type (S11,S14,P11,P14) where at least a part (28) of an outer curved portion of the piezoelectric film (14) is located further out than an outer curved portion (26) of a region (24) in which the upper electrode (15) and the lower electrode (13) face each other across the piezoelectric film (14); and
b) a second type (Sl2,S13,P12,P13) in which at least a part of an outer curved portion of the piezoelectric film (14) coincides with an outer curved portion (26) of a region (24) in which the upper electrode (15) and the lower electrode (13) face each other across the piezoelectric film (14) or is further inside the outer curved portion (26) of the region (24).
公开/授权文献
- EP1863173A3 Filter having multiple piezoelectric thin-film resonators 公开/授权日:2009-07-15
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