| 摘要 |
PROBLEM TO BE SOLVED: To attenuate noise having a frequency component of the order of several GHz by setting the product of the electrical conductivity and magnetic permeability of a conductive member, having a first material and a second material larger than the product of the electrical conductivity and magnetic permeability of a conductive member which has either of the first or second materials and not have the other material. SOLUTION: When the skin depth of a conductive member to which current is concentrated by the skin effect is defined asδ, it can be expressed as #= 2/(ωσμ)}1/2, (ω: angle frequency,σ: electric conductivity,μ: magnetic permeability). For example, when a first material is silver, a second material is a ferrite, the product of the conductivityσand the magnetic permeabilityμisσμ2, and that of a conductive member having silver but not ferrite as a comparative conductive member is set asσμ1, the quantity of ferrite to be contained is selected so thatσμ2 is larger thanσμ1, whereby the skin depthσcan be set smaller than that of the comparasion conductive member. Thus, the skin depthσof frequency of a noise can be also minimized, and high frequency noise can be attenuated.
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