| 摘要 |
PROBLEM TO BE SOLVED: To enable the removal of noise over a frequency band of a wide range without increasing the number of ferrite cores.SOLUTION: A noise filter A includes a ferrite core 20 with an insertion hole 22 through which a conduction path W is inserted formed, and the ferrite core 20 is configured by arranging a first magnetic material 23 and a second magnetic material 25 having different materials so as to surround the conduction path W and also to be adjacent to each other in a circumferential direction. The ferrite core 20 is configured by arranging two kinds of magnetic materials 23 and 25 having different materials so as to surround the conduction path W and to be adjacent to each other in the circumferential direction. Then, noise elimination performance can be improved while suppressing cost low by combining the magnetic materials 23 and 25 having different impedance characteristics and different magnetic permeability.SELECTED DRAWING: Figure 1 |
