发明名称 |
Unidirectional surface acoustic wave filter |
摘要 |
<p>The inside-band characteristic of an internal reflection type unidirectional surface acoustic wave filter is improved. The internal reflection type unidirectional surface acoustic wave filter having positive and negative finger electrodes (10, 11) of the interdigital transducer and having open or short-circuit type floating electrodes (12) therebetween is subjected to weighting of its electrodes by a withdrawal technique and is structured such that at portions wherein no electrical cross is made between the positive and negative finger electrodes, i.e., in case where adjacent finger electrodes each have the same sign as that of the positive finger electrode or negative finger electrode, the floating electrodes (13) located therebetween are displaced from the center positions therebetween. <IMAGE></p> |
申请公布号 |
EP0840446(A2) |
申请公布日期 |
1998.05.06 |
申请号 |
EP19970118941 |
申请日期 |
1997.10.30 |
申请人 |
NEC CORPORATION |
发明人 |
KAJIHARA, RYUJI;YAMAMOTO, YASUSHI |
分类号 |
H03H9/145;H03H9/64;(IPC1-7):H03H9/64 |
主分类号 |
H03H9/145 |
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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