JP4036300B2 - 磁気損失体及びその製造方法 - Google Patents
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Description
μ = μ0・μip = 4π×10−7×1/2μeff
(ρ:電気抵抗[Ωm]、f:周波数[Hz]、μeff:透磁率)
(参考文献)
R. M. Bozorth: Ferromagnetism (D. Van Nostrand Co. Inc., N. Y,
1951).山口正洋、熊谷史人、荒川信一郎、荒井賢一、菊池新喜:平成4年度電気学会全国大会予稿集, 1679
(1992).
Y. Shimada, E. Sugawara and H. Fujimori: J. Appl. Phys., 76, 2395
(1994).
f=100MHzにおける粉末eのμeff=17、ρ=9.0×10−7Ω・mであり、この時のδsは8.2μmである。
ここで、S11=20log|Γ|、S21=20log|Τ|である。
21 磁気損失体
22 マイクロストリップ線路
23 ネットワークアナライザ
24 同軸ケーブル
25 磁気損失体
Claims (11)
- 軟磁性体粉末と結合剤からなり、虚部透磁率μ″の周波数分散が、分散周波数領域の異なる少なくとも2つの分散要素からなり、高周波側の分散D1と低周波側の分散D2の各々の最大値μ″max(D1)及びμ″max(D2)の関係が、μ″max(D2)≧μ″max(D1)であり、前記高周波側の分散D1が渦電流による分散であり、前記低周波側の分散D2が磁気共鳴による分散である、磁気損失体。
- 前記虚部透磁率μ″の分散D1とD2の各々が最大値をとる周波数fr″max(D1)及びfr″max(D2)の差Δfr″が、前記分散D1の半値幅D150及び前記分散D2の半値幅D250に対して、
Δfr″≦D150
及び
Δfr″≦D250
のいずれか一方が成り立つ関係にある、請求項1記載の磁気損失体。 - 前記軟磁性体粉末が、組成、粒径、及び粒子形状のいずれかが異なる第1から第(n+1)の粉末を混ぜ合わせたものからなり(但しnは正の整数)、第1の粉末の虚部透磁率μ″が最大値μ″max1を与える周波数fr1と第(n+1)の粉末の虚部透磁率μ″が最大値μ″max(n+1)を与える周波数fr(n+1)の関係がfr1>fr(n+1)であり、なおかつμ″max1<μ″max(n+1)の関係にある複数の粉末を選択した、請求項1又は請求項2記載の磁気損失体。
- 前記軟磁性体粉末は粉末粒子を含有した第1及び第2の粒子群を含み、前記第1の粒子群の粉末粒子は前記軟磁性体粉末の表皮深さよりも大きな第1の寸法を有し且つ前記分散D1をもたらすものであり、前記第2の粒子群の粉末粒子は前記表皮深さよりも小さな第2の寸法を有し且つ前記分散D2をもたらすものである、請求項1乃至請求項3のいずれかに記載の磁気損失体。
- 前記粉末粒子は不定形状又は扁平形状を有し、前記第1及び前記第2の寸法は前記不定形状の径又は前記扁平形状の厚みである、請求項4に記載の磁気損失体。
- 前記第1及び前記第2の粒子群の各々は、前記表皮深さよりも大きな径を有する不定形状の出発原料粉末を摩砕することにより得られたものである、請求項4又は請求項5記載の磁気損失体。
- 虚部透磁率μ″の周波数分散が、分散周波数領域の異なる2つの分散D1,D2を有し、高周波側の分散D1と低周波側の分散D2の各々の最大値μ″ max (D1)及びμ″ max (D2)の関係が、μ″ max (D2)≧μ″ max (D1)となり、前記高周波側の分散D1が渦電流による分散であり、前記低周波側の分散D2が磁気共鳴による分散である磁気損失体の製造方法であって、
表皮深さよりも大きな厚さ又は径を有する不定形状の軟磁性体粉末を用意する工程と、
前記軟磁性体粉末に磨砕加工を施すことにより、前記表皮深さよりも大きな厚さ又は径を有する不定形状ないし扁平形状の第1の粒子群と前記表皮深さよりも小さな厚さ又は径を有する不定形状ないし扁平形状の第2の粒子群からなる軟磁性体粉末を得る工程と、
前記磨砕加工を施した軟磁性体粉末に高分子化合物を含む結合剤を混合して混和物とする工程と、
前記混和物を成形する工程とを含む
ことを特徴とする、磁気損失体の製造方法。 - 虚部透磁率μ″の周波数分散が、分散周波数領域の異なる少なくとも2つの分散要素からなり、高周波側の分散D1と低周波側の分散D2の各々の最大値μ″max(D1)及びμ″max(D2)の関係が、μ″max(D2)≧μ″max(D1)となり、前記高周波側の分散D1が渦電流による分散であり、前記低周波側の分散D2が磁気共鳴による分散であるように、前記軟磁性体粉末を用意し、
当該用意された軟磁性体粉末と結合剤を混合して混和物を得、
当該混和物を成形して
磁気損失体を製造する方法。 - 前記虚部透磁率μ″の分散D1とD2の各々が最大値をとる周波数fr″max(D1)及びfr″max(D2)の差Δfr″が、前記分散D1の半値幅D150及び前記分散D2の半値幅D250に対して、
Δfr″≦D150
及び
Δfr″≦D250
のいずれか一方が成り立つ関係にあるように、前記軟磁性体粉末を用意する、請求項8記載の方法。 - 前記軟磁性体粉末の表皮深さよりも大きな第1の寸法を有し且つ前記分散D1をもたらす第1の粒子群と、前記表皮深さよりも小さな第2の寸法を有し且つ前記分散D2をもたらす第2の粒子群を含むように、前記軟磁性体粉末を用意する、請求項8又は請求項9記載の方法。
- 前記表皮深さよりも大きな径を有する不定形状の出発原料粉末を摩砕することにより、前記第1及び前記第2の粒子群を生成する、請求項10記載の方法。
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DE102007055291A1 (de) | 2006-11-22 | 2008-06-26 | Nec Tokin Corp., Sendai | Mehrschichtige gedruckte Leiterplatte |
JP5139750B2 (ja) * | 2006-11-22 | 2013-02-06 | Necトーキン株式会社 | 多層プリント配線基板 |
JP5108859B2 (ja) * | 2009-11-16 | 2012-12-26 | 藤倉ゴム工業株式会社 | ノイズ抑制シートの製造方法 |
JP5912278B2 (ja) * | 2011-04-06 | 2016-04-27 | Necトーキン株式会社 | 電磁干渉抑制体 |
JP6633037B2 (ja) * | 2017-09-12 | 2020-01-22 | 株式会社リケン | 近傍界用ノイズ抑制シート |
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