| 发明名称 | Acoustic wave filter, duplexer, and module | ||
| 摘要 | An acoustic wave filter includes: at least a parallel resonator, wherein at least one of the parallel resonator includes a piezoelectric substance, an IDT located on the piezoelectric substance, and reflectors located on the piezoelectric substance so as to sandwich the IDT, and a distance between a first electrode finger that is an electrode finger closest to the reflector among electrode fingers of the IDT and a second electrode finger that is an electrode finger closest to the IDT among electrode fingers of the reflector is less than 0.25(λIDT+λref) where a period of the electrode fingers of the IDT is λIDT and a period of the electrode fingers of the reflector is λref. | ||
| 申请公布号 | US9148121(B2) | 申请公布日期 | 2015.09.29 |
| 申请号 | US201313950600 | 申请日期 | 2013.07.25 |
| 申请人 | TAIYO YUDEN CO., LTD. | 发明人 | Inoue Shogo |
| 分类号 | H03H9/25;H03H9/72;H03H9/02;H03H9/145;H03H9/64;H03H9/00 | 主分类号 | H03H9/25 |
| 代理机构 | Chen Yoshimura LLP | 代理人 | Chen Yoshimura LLP |
| 主权项 | 1. An acoustic wave filter comprising: at least a parallel resonator, wherein at least one of the parallel resonator includes a first piezoelectric substance, a first IDT (Interdigital Transducer) located on the first piezoelectric substance, and first reflectors located on the first piezoelectric substance so as to sandwich the IDT, and G is less than 0 and greater than or equal to −0.05λIDT where D1=0.25(λref+λIDT)+G, a distance between a center of a first electrode finger that is an electrode finger closest to the first reflector among electrode fingers of the first IDT and a center of a second electrode finger that is an electrode finger closest to the first IDT among electrode fingers of the first reflector is D1, a period of the electrode fingers of the first IDT is λIDT, and a period of the electrode fingers of the first reflector is λref. | ||
| 地址 | Tokyo JP | ||