发明名称 |
Surface acoustic wave filter device and transducer therefor having unidirectional and bidirectional structures |
摘要 |
A surface acoustic wave filter device suitable for CDMA communication system, includes a piezoelectric substrate, and a unidirectional input side transducer and a bidirectional output side transducer are formed on the substrate. The filter device has satisfactory filtering characteristics in terms of insertion loss, frequency characteristic, T.T.E. attenuation level, group delay time, etc.
|
申请公布号 |
US5909157(A) |
申请公布日期 |
1999.06.01 |
申请号 |
US19970842268 |
申请日期 |
1997.04.24 |
申请人 |
NGK INSULATORS, LTD. |
发明人 |
TANAKA, MITSUHIRO;NOMOTO, SUSUMU;SUGIYAMA, MASAHIKO;SUZUKI, KENJI |
分类号 |
H03H9/00;H03H9/02;H03H9/145;H03H9/64;(IPC1-7):H03H9/145 |
主分类号 |
H03H9/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|