| 摘要 |
PURPOSE:To attain low cost and miniaturization by providing an inductance in parallel with an LC series resonance circuit and winding an earth winding on the inductance overlappingly by one turn or over in the opposite winding direction. CONSTITUTION:An inductance L3 is provided in parallel with a series resonance circuit comprising an inductance L2 and a capacitor C2 to provide an attenuation pole at a low frequency and the earth winding LE is wound on the inductance L3 in the opposite winding direction to that of the inductance L3. Thus, an optional attenuation pole is provided to a frequency higher than the pass band of the band-pass filter. Thus, the band-pass filter whose size is decreased is obtained.
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