发明名称 |
Surface acoustic wave apparatus and communication unit |
摘要 |
A surface acoustic wave apparatus includes three longitudinally-coupled-resonator-type interdigital transducers (IDTs) having a balanced-to-unbalanced conversion function, which are provided on a piezoelectric substrate in a direction in which a surface acoustic wave (SAW) propagates. Weighting is applied to at least one of the IDTs. For example, among the electrode fingers of the IDT located on the left side, an apodization-weighted electrode finger is provided for one of the electrode fingers positioned adjacent to the central IDT.
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申请公布号 |
US6815868(B2) |
申请公布日期 |
2004.11.09 |
申请号 |
US20020118358 |
申请日期 |
2002.04.09 |
申请人 |
MURATA MANUFACTURING CO., LTD. |
发明人 |
SHIBATA OSAMU;TAKAMINE YUICHI;WATANABE HIROKI;YATA MASARU;SAWADA YOICHI |
分类号 |
H03H9/25;H03H9/00;H03H9/145;H03H9/64;(IPC1-7):H03H9/25 |
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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