发明名称 |
ACOUSTIC WAVE FILTER, DUPLEXER, AND MODULE |
摘要 |
An acoustic wave filter includes: one or more series resonators connected in series between an input terminal and an output terminal; and parallel resonators connected in parallel between the input terminal and the output terminal and formed of piezoelectric thin film resonators, wherein each of at least two resonators of the parallel resonators includes an additional film having island-shaped patterns or aperture patterns formed at equal pitch intervals in a resonance region in which a lower electrode and an upper electrode face each other across a piezoelectric film, and a pitch interval of the island-shaped patterns or the aperture patterns in the additional film included in one of the at least two resonators differs from a pitch interval of the island-shaped patterns or the aperture patterns in the additional film included in another one of the at least two resonators. |
申请公布号 |
US2017054431(A1) |
申请公布日期 |
2017.02.23 |
申请号 |
US201615236109 |
申请日期 |
2016.08.12 |
申请人 |
TAIYO YUDEN CO., LTD. |
发明人 |
SHIMOMURA Hikaru;NISHIZAWA Toshio |
分类号 |
H03H9/70;H03H9/54;H03H9/58 |
主分类号 |
H03H9/70 |
代理机构 |
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代理人 |
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主权项 |
1. An acoustic wave filter comprising:
one or more series resonators connected in series between an input terminal and an output terminal; and parallel resonators connected in parallel between the input terminal and the output terminal and formed of piezoelectric thin film resonators, wherein each of at least two resonators of the parallel resonators includes an additional film having island-shaped patterns or aperture patterns formed at equal pitch intervals in a resonance region in which a lower electrode and an upper electrode face each other across a piezoelectric film, and a pitch interval of the island-shaped patterns or the aperture patterns in the additional film included in one of the at least two resonators differs from a pitch interval of the island-shaped patterns or the aperture patterns in the additional film included in another one of the at least two resonators. |
地址 |
Tokyo JP |