| 摘要 |
PROBLEM TO BE SOLVED: To provide a multiband acoustic wave filter achieving excellent temperature characteristics. SOLUTION: A center frequency f<SB>1</SB>of an SAW filter 10 is lower than that f<SB>2</SB>of an SAW filter 30. For the SAW filters 10, 30, film thickness (h) in an interdigital electrode is all set equally. And when the metallization ratio of input-side interdigital electrodes 12, 14 and that of output-side interdigital electrodes 16, 18 are set to Mi1 and Mo1, respectively, for the SAW filter 10. The metallization ratio of input-side interdigital electrode 32, 34 and that of output-side interdigital electrode 36, 38 are set to Mi2 and Mo2, respectively, for the SAW filter 30, Mi1>Mi2 and Mo1>Mo2 are established. COPYRIGHT: (C)2006,JPO&NCIPI
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