| 发明名称 |
SAW DEVICE AND COMMUNICATION DEVICE USING SAW DEVICE |
| 摘要 |
A SAW device comprises input/output interdigital transducer (IDT) electrodes (11, 12) provided on piezoelectric substrates (10), a first reflector electrode (13) following the input IDT electrode (11), and a second reflector electrode (14) preceding the output IDT electrode (12). The device satisfies the following inequality (1) to provide preferable characteristics in a pass band: 2(&thetas; - 5) </= tan<-1)<D / L) </= 2(&thetas; +5) where &thetas;: the inclination (in degree, except zero) of the first or second reflector electrode of the input and output IDT electrodes with respect to a plane perpendicular to the direction in which surface acoustic waves travel. D: the pitch (in micron) of the input and output IDT electrodes in the direction in which surface acoustic waves travel. L: the pitch (in micron) of the first and second reflector electrodes. <IMAGE> |
| 申请公布号 |
EP1158670(A4) |
申请公布日期 |
2004.11.03 |
| 申请号 |
EP20000981655 |
申请日期 |
2000.12.11 |
| 申请人 |
MATSUSHITA ELECTRIC IND CO LTD |
发明人 |
TSUZUKI SHIGERU;IGAKI TSUTOMU;MATSUNAMI KEN;NISHIMURA KAZUKI |
| 分类号 |
H03H9/00;H03H9/02;H03H9/145;H03H9/64 |
主分类号 |
H03H9/00 |
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