发明名称 |
Surface acoustic wave (SAW) resonator, SAW filter and SAW antenna duplexer using the SAW resonator |
摘要 |
A SAW resonator includes an IDT electrode (13) formed on a piezoelectric substrate and reflector electrodes (14,15) disposed on both sides of the IDT electrode. The IDT electrode includes first finger-electrodes (132), second finger-electrodes (134) and strip-line electrodes (135). The first and the second finger-electrodes do not overlap with each other but are acoustically coupled together by the strip-line electrodes. This acoustic coupling by the strip-line electrodes eliminates the need for a common bus-bar electrode, so that the loss caused by the resistance of the common bus-bar electrode can be reduced, and the SAW resonator can be downsized. <IMAGE> |
申请公布号 |
EP1463200(A3) |
申请公布日期 |
2004.10.06 |
申请号 |
EP20040007553 |
申请日期 |
2004.03.29 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
NAKAMURA, HIROYUKI;SEKI, SHUNICHI;NISHIMURA, KAZUNORI;SAKURAGAWA, TORU |
分类号 |
H03H9/25;H03H9/145;H03H9/64 |
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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