| 摘要 |
PROBLEM TO BE SOLVED: To provide a downsized filter block containing three inductors as one unit, thereby, the number of inductors to be mounted on a circuit board is reduced and an operation of mounting is reduced, even though the number of inductors increases for low noise and multi-channel requirement. SOLUTION: In the filter block having a plurality of inductor combined with a pot-type core and a coil, the pot-type core contains a pair of EP type ferrite core consisting of a sidewall portion whose inside circumferential surface is U shaped, a bottom portion which is continually formed from a side surface of the sidewall portion, and cylindrical portions which are implanted at the bottom portions, and coils are located over each of the cylindrical portions of the EP type ferrite cores. An I type ferrite core is sandwiched between the pair of the EP type ferrite core, and the relation between the permeabilityμi of the I type ferrite core and the permeabilityμe of the EP type ferrite core is expressed by the formulaμi<μe. COPYRIGHT: (C)2003,JPO
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