| 摘要 |
Under circumstances where communication devices such as mobile phones are required to be diversified, laminate filters are required to have attenuation-band characteristics which are steep on both low-frequency and high-frequency sides. The prior-art laminate filter has the problem that an attenuation band is formed only on the low-frequency side or on the high-frequency side. A laminate filter has stripline patterns that are first, second, and third resonant elements disposed on a dielectric layer, a capacitively coupled (C-coupled) pattern disposed between the first and second stripline patterns, an inductively coupled (M-coupled) pattern disposed between the second and third stripline patterns.
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