发明名称 |
Surface acoustic wave device, surface acoustic wave apparatus, and communications equipment |
摘要 |
A second substrate 21 composed of a material having a lower dielectric constant than that of a piezoelectric substrate 2 having a transmission-side filter region 12 and a receiving-side filter region 13 formed therein is joined to the other main surface of the piezoelectric substrate 2, and a conductor layer 22 is formed throughout the other main surface of the second substrate 21. The effective dielectric constant of the substrate is reduced, thereby making it possible to reduce a parasitic capacitance formed between an input electrode section 5 in the transmission-side filter region 12 and an output electrode section 6 in the receiving-side filter region 13 and to improve isolation characteristics.
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申请公布号 |
US7609129(B2) |
申请公布日期 |
2009.10.27 |
申请号 |
US20050190515 |
申请日期 |
2005.07.27 |
申请人 |
KYOCERA CORPORATION |
发明人 |
YOKOTA YUUKO;YAMAGATA YOSHIFUMI;IIOKA KIYOHIRO |
分类号 |
H03H9/72;H03H9/05;H03H9/64 |
主分类号 |
H03H9/72 |
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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