| 发明名称 |
SURFACE ACOUSTIC WAVE FILTER AND FILTER APPARATUS |
| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface acoustic wave filter for reducing stray static capacitance without upsizing a chip and to provide a filter apparatus. SOLUTION: The performance of impedance matching is enhanced by designing a product CopCos between a static capacitance Cop of a parallel SAW resonator and a static capacitance Cos of a series SAW resonator to satisfy expression 7: 1×10<SP>6</SP>≤ω<SB>0</SB><SP>2</SP>R<SP>2</SP>CopCos≤3.1×10<SP>6</SP>, or expression 8: 1.3×10<SP>6</SP>≤ω<SB>0</SB><SP>2</SP>R<SP>2</SP>CopCos≤3.1×10<SP>6</SP>, or preferably expression 9: 1.6×10<SP>6</SP>≤ω<SB>0</SB><SP>2</SP>R<SP>2</SP>CopCos≤2.9×10<SP>6</SP>. COPYRIGHT: (C)2004,JPO
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| 申请公布号 |
JP2004146861(A) |
申请公布日期 |
2004.05.20 |
| 申请号 |
JP20020306041 |
申请日期 |
2002.10.21 |
| 申请人 |
FUJITSU MEDIA DEVICE KK;FUJITSU LTD |
发明人 |
NAKATANI TADASHI;MIYASHITA TSUTOMU;SATO YOSHIO |
| 分类号 |
H03H9/02;H03H9/145;H03H9/25;H03H9/64;(IPC1-7):H03H9/64 |
主分类号 |
H03H9/02 |
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