发明名称 |
Surface acoustic wave apparatus |
摘要 |
A surface acoustic wave apparatus has a configuration by which the spurious of the higher-order transverse modes is suppressed and a SAW excitation intensity distribution is not changed in the propagation direction. The surface acoustic wave apparatus has at least one interdigital transducer, which is disposed such that a plurality of comb-shape electrodes respectively connected to common electrodes are interleaved, wherein a region with the plurality of interleaved comb-shape electrodes has a first overlapping region with a overlapping length constant over a whole area along a propagation direction of a surface acoustic wave and a second overlapping region formed on at least one side of the first overlapping region with a overlapping length weighted in the propagation direction of the surface acoustic wave, and wherein an overlapping-length weighting envelope curve in the second overlapping region has at least two changing points in the propagation direction of the surface acoustic wave.
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申请公布号 |
US7522021(B2) |
申请公布日期 |
2009.04.21 |
申请号 |
US20060349108 |
申请日期 |
2006.02.08 |
申请人 |
FUJITSU MEDIA DEVICES LIMITED;FUJITSU LIMITED |
发明人 |
WADA KOICHI;MITOBE SEIICHI;INOUE SHOGO |
分类号 |
H03H9/145;H03H9/25;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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