发明名称 |
Longitudinally coupled resonator type surface acoustic wave filter having narrow electrode finger pitch sections |
摘要 |
A longitudinally coupled resonator type surface acoustic wave filter includes a piezoelectric substrate and first, second and third IDTs provided on the piezoelectric substrate and arranged in a surface wave propagating direction such that the second IDT is interposed between the first and the third IDTs. Each of the first, second and third IDTs has a plurality of electrode fingers. The first and second IDTs have narrow electrode-finger pitch sections that have an electrode-finger pitch narrower than the remaining electrode-finger pitches, at respective end portions of the first and second IDTs adjacent to each other. The second and third IDTs have narrow electrode-finger pitch sections that have an electrode-finger pitch narrower than the remaining electrode-finger pitches, at respective end portions of the second and third IDTs adjacent to each other. The electrode-finger pitch of the narrow electrode-finger pitch sections in the first and second IDTs is different from the electrode-finger pitch of the narrow electrode-finger pitch sections in the second and third IDTs.
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申请公布号 |
US6621380(B2) |
申请公布日期 |
2003.09.16 |
申请号 |
US20010855246 |
申请日期 |
2001.05.15 |
申请人 |
MURATA MANUFACTURING CO., LTD. |
发明人 |
TAKAMINE YUICHI |
分类号 |
H03H9/145;H03H9/00;H03H9/02;H03H9/64;H03H9/72;(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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