发明名称 |
ACOUSTIC WAVE FILTER DEVICE |
摘要 |
An acoustic wave filter device is capable of increasing the steepness of a filter characteristic at a boundary between a passband and an attenuation band and achieving a low loss in the passband. The acoustic wave filter device has a ladder circuit configuration including a plurality of series arm resonators and at least one parallel arm resonator. The anti-resonant frequency of the series arm resonator is different from that of the series arm resonator. The series arm resonator having the lowest anti-resonant frequency has a resonant frequency located in the passband and an electromechanical coupling coefficient less than an average of electromechanical coupling coefficients of the series arm resonators.
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申请公布号 |
US2010207707(A1) |
申请公布日期 |
2010.08.19 |
申请号 |
US20100773103 |
申请日期 |
2010.05.04 |
申请人 |
MURATA MANUFACTURING CO., LTD. |
发明人 |
YATA MASARU |
分类号 |
H03H9/25 |
主分类号 |
H03H9/25 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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