| 发明名称 | Ladder filter and duplexer | ||
| 摘要 | A ladder filter includes a plurality of series-arm resonators and parallel-arm resonators including surface acoustic wave resonators. A metallization ratio of the series-arm resonator having the smallest electrostatic capacity among the plurality of series-arm resonators is the smallest among the plurality of series-arm resonators and an electrode finger pitch of the series-arm resonator having the smallest electrostatic capacity is the largest among electrode finger pitches of the plurality of series-arm resonators. | ||
| 申请公布号 | US9614278(B2) | 申请公布日期 | 2017.04.04 |
| 申请号 | US201514840108 | 申请日期 | 2015.08.31 |
| 申请人 | Murata Manufacturing Co., Ltd. | 发明人 | Takata Toshiaki |
| 分类号 | H01Q1/50;H03H9/72;H01Q5/50;H03H9/00;H03H9/64 | 主分类号 | H01Q1/50 |
| 代理机构 | Keating & Bennett, LLP | 代理人 | Keating & Bennett, LLP |
| 主权项 | 1. A ladder filter comprising: a plurality of series-arm resonators including a surface acoustic wave resonator; and a parallel-arm resonator including a surface acoustic wave resonator; wherein a metallization ratio of a series-arm resonator with a smallest electrostatic capacity among the plurality of series-arm resonators is smallest among the plurality of series-arm resonators and an electrode finger pitch of the series-arm resonator having the smallest electrostatic capacity is largest among electrode finger pitches of the plurality of series-arm resonators. | ||
| 地址 | Kyoto JP | ||