JP2008098392A - Electromagnetic interference suppressor using soft magnetic powder - Google Patents

Electromagnetic interference suppressor using soft magnetic powder Download PDF

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JP2008098392A
JP2008098392A JP2006278418A JP2006278418A JP2008098392A JP 2008098392 A JP2008098392 A JP 2008098392A JP 2006278418 A JP2006278418 A JP 2006278418A JP 2006278418 A JP2006278418 A JP 2006278418A JP 2008098392 A JP2008098392 A JP 2008098392A
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electromagnetic interference
soft magnetic
magnetic powder
iron
interference suppressor
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Masakazu Abe
正和 阿部
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Tokin Corp
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NEC Tokin Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic interference suppressor using a soft magnetic powder which can suppress suprious radiation noise easily in a wide band. <P>SOLUTION: The electromagnetic interference suppressor is made by pasting together two kinds of composite magnetic substances, each consisting of a soft magnetic powder which has either a flat or needlelike particle configuration and has a different average particle diameter and an aspect ratio, and organic binder, and therefore has at least two magnetic resonances provided by anisotropic magnetic fields (Hk) having a different magnitude. As for the soft magnetic powder, pure iron, iron-aluminum-silicon alloy, iron-nickel alloy, amorphus alloy, or the like which is powderized by pulverization is used. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、高周波領域における不要輻射ノイズの干渉によって生じるノイズ障害を抑制するための磁気損失特性に優れた軟磁性体粉末と有機結合剤からなる軟磁性体粉末を用いた電磁干渉抑制体に関する。   The present invention relates to an electromagnetic interference suppressor using a soft magnetic powder made of an organic binder and a soft magnetic powder excellent in magnetic loss characteristics for suppressing noise disturbance caused by interference of unwanted radiation noise in a high frequency region.

近年、高速動作する高集積な半導体素子の普及が著しい。その例として、ランダムアクセスメモリ（ＲＡＭ）、リードオンリーメモリー（ＲＯＭ）、マイクロプロセッサ（ＭＰＵ）、中央演算処理素子（ＣＰＵ）又は画像プロセッサ算術論理演算素子（ＩＰＡＬＵ）等の論理回路素子がある。これらの能動素子においては、演算速度や信号処理速度が日進月歩の勢いで高速化されており、高速電子回路を伝搬する電気信号は、電圧、電流の大きな変動を伴うために、誘導性のノイズが発生し易く、高周波不要輻射ノイズ源となっている。   In recent years, the spread of highly integrated semiconductor elements that operate at high speed is remarkable. Examples include logic circuit elements such as random access memory (RAM), read only memory (ROM), microprocessor (MPU), central processing unit (CPU) or image processor arithmetic logic unit (IPALU). In these active elements, calculation speed and signal processing speed are increasing rapidly, and electric signals propagating through high-speed electronic circuits are accompanied by large fluctuations in voltage and current. It is easy to generate and becomes a high frequency unnecessary radiation noise source.

一方、電子部品や、電子機器の軽量化、薄型化、小型化の流れも止まることなく急速な勢いで進行している。それに伴い、半導体素子の集積度や、プリント配線基板への電子部品実装密度も極めて高くなっている。したがって、電子部品類やプリント配線、あるいはモジュール間配線等が互いに極めて接近することになり、前述した信号処理速度の高速化と併せて、高周波不要輻射ノイズが、より誘発され易くなってきている。   On the other hand, electronic components and electronic devices are proceeding at a rapid pace without stopping the trend of lighter, thinner and smaller electronic devices. Along with this, the degree of integration of semiconductor elements and the density of electronic components mounted on a printed wiring board have become extremely high. Accordingly, electronic components, printed wiring, inter-module wiring, and the like are very close to each other, and in addition to the increase in the signal processing speed described above, high-frequency unnecessary radiation noise is more easily induced.

これらの、高速化、高機能化、高密度化された電子装置におけるノイズ対策、及び電磁波障害、特に準マイクロ波帯におけるノイズ対策としてローパスフィルタ等の部品の使用やシールディングを行う等の方法がとられて来た。   There are methods such as using low-pass filters and shielding as countermeasures against noise in these high-speed, high-functionality, high-density electronic devices, and electromagnetic interference, especially in the quasi-microwave band. I was taken.

しかし、部品を設けることによるノイズ対策では、実装するスペースが必要になり小型化、薄型化は困難である。また、インダクタンス部品は実数部透磁率μ'に寄与し、現状準マイクロ波帯でのインダクタンスに不充分である。さらには、シールディングを行った場合、不用意な遮蔽により二次的な電磁結合を引き起こすことがある。   However, noise countermeasures by providing components require a space for mounting, and it is difficult to reduce the size and thickness. In addition, the inductance component contributes to the real part permeability μ ′ and is insufficient for inductance in the current quasi-microwave band. Furthermore, when shielding is performed, secondary electromagnetic coupling may occur due to careless shielding.

そこで、電磁干渉抑制体を不要輻射ノイズ源近傍に設置することで、不要輻射ノイズを簡便且つ効果的に抑制できる。この電磁干渉抑制体とは、軟磁性体粉末の形状を扁平もしくは、針状にすることによって形状磁気異方性が出現し、高周波領域にて磁気共鳴に基づく虚数部透磁率μ”の増大化が生じた磁気損失体である。磁気損失体を利用した不要輻射減衰の作用機構については、不要輻射ノイズ源となっている電子回路に対して等価的な抵抗成分が付与されることによることがわかっている。   Therefore, the unnecessary radiation noise can be easily and effectively suppressed by installing the electromagnetic interference suppressing body in the vicinity of the unnecessary radiation noise source. This electromagnetic interference suppressor means that the shape magnetic anisotropy appears when the shape of the soft magnetic powder is made flat or needle-shaped, and the imaginary part permeability μ ”based on magnetic resonance is increased in the high frequency region. The mechanism of unnecessary radiation attenuation using the magnetic loss body is due to the addition of an equivalent resistance component to the electronic circuit that is the source of unnecessary radiation noise. know.

ここで、等価的な抵抗成分の大きさは、虚数部透磁率μ”の大きさに依存し、ノイズ抑制効果が現れる周波数領域、虚数部透磁率μ”の周波数分散に依存する。以上のことにより、準マイクロ波帯に対応し、高い実数部透磁部μ'と虚数部透磁率μ”を利用した電磁干渉抑制体として、不要輻射ノイズの抑制及び二次的な電磁結合を軽減でき、これらによって、簡便に電磁干渉を抑制することができる。さらに、現在では磁気共鳴を低周波側に移行させ準マイクロ波帯以下でも抑制できる複合磁性体も提供されている。   Here, the size of the equivalent resistance component depends on the magnitude of the imaginary part permeability μ ″, and depends on the frequency range in which the noise suppression effect appears and the frequency dispersion of the imaginary part permeability μ ″. As described above, as an electromagnetic interference suppressor using a high real part permeability part μ ′ and an imaginary part permeability μ ”corresponding to the quasi-microwave band, it suppresses unnecessary radiation noise and performs secondary electromagnetic coupling. There are also provided composite magnetic bodies that can easily suppress electromagnetic interference, and that can suppress magnetic interference at lower frequencies by shifting magnetic resonance to the low frequency side.

特開平７−２１２０７９号公報Japanese Patent Laid-Open No. 7-212079 特開平９−０３５９２７号公報Japanese Patent Laid-Open No. 9-035927 特開２００１−２１０５１０号公報JP 2001-210510 A

しかしながら、前記した電子部品や電子機器の高機能化、高密度化が日進月歩で進められており、実際に種々の電子回路にて発生している不要輻射の周波数分布は、ほとんどの場合、準マイクロ波帯以下から準マイクロ波帯に至る広帯域に及んでいる。そのため、通常の軟磁性体にみられる磁気共鳴による急峻な虚数部透磁率μ"の周波数分散では充分にカバーしきれず、広帯域でのノイズ抑制効果が望めない。そこで、広帯域での不要輻射ノイズ抑制効果に対応するための電磁干渉抑制体、ここでの複合磁性体を提供することが課題である。本発明は、このような高速動作する半導体素子や電子機器などから発生する、不要輻射ノイズを簡便且つ広帯域で抑制できる軟磁性体粉末を用いた電磁干渉抑制体を提供することを目的とするものである。   However, as the above-mentioned electronic components and electronic devices have been improved in function and density, the frequency distribution of unnecessary radiation actually generated in various electronic circuits is almost quasi-micro. It covers a wide band from below the waveband to the quasi-microwave band. For this reason, the frequency dispersion of the steep imaginary part permeability μ "due to magnetic resonance found in ordinary soft magnetic materials cannot be sufficiently covered, and a noise suppression effect in a wide band cannot be expected. It is an object of the present invention to provide an electromagnetic interference suppressor for dealing with the effect, and a composite magnetic body here.The present invention eliminates unnecessary radiation noise generated from such semiconductor elements and electronic devices that operate at high speed. An object of the present invention is to provide an electromagnetic interference suppressor using a soft magnetic powder that can be easily suppressed in a wide band.

本発明は、平均粒径、アスペクト比が異なる扁平状もしくは針状の粒子形状を有する軟磁性体粉末と有機結合剤とからなる２種類の複合磁性体を貼り合わせることにより、互いに異なる大きさの異方性磁界（Ｈｋ）によってもたされる磁気共鳴を少なくとも２つ有する軟磁性体粉末を用いた電磁干渉抑制体である。   In the present invention, two types of composite magnetic bodies composed of a soft magnetic powder having a flat or needle-like particle shape having different average particle diameters and aspect ratios and an organic binder are bonded to each other, thereby having different sizes. An electromagnetic interference suppressor using a soft magnetic powder having at least two magnetic resonances caused by an anisotropic magnetic field (Hk).

また、本発明は、前記軟磁性体粉末が、鉄、鉄アルミニウム珪素合金、鉄ニッケル合金、アモルファス合金、鉄酸化物の少なくともいずれかである電磁干渉抑制体である。また、本発明は、前記軟磁性体粉末が、配向されている電磁干渉抑制体である。   The present invention is the electromagnetic interference suppressor, wherein the soft magnetic powder is at least one of iron, iron aluminum silicon alloy, iron nickel alloy, amorphous alloy, and iron oxide. The present invention is the electromagnetic interference suppressor in which the soft magnetic powder is oriented.

伝送損失の測定方法にはインピーダンス＝５０Ωのマイクロストリップラインを使用したが、面実装部品の近傍ノイズ伝送損失測定として、広く使われている方法である。ここで、伝送損失とは、近傍での不要輻射ノイズの抑制効果を表す。図１は、使用したマイクロストリップラインの概略図を示す。基板の表面に直線上の導体路を設け、この導体路上に電磁干渉抑制体３を配置させたものである。導体路の両端をネットワークアナライザーに接続し、反射量（Ｓ１１）、透過（Ｓ２１）を測定し、それらの差から伝送損失を次式（１）で求めることができる。   A microstrip line with an impedance of 50Ω is used as a method for measuring transmission loss, but this is a widely used method for measuring near-surface noise transmission loss of surface-mounted components. Here, the transmission loss represents an effect of suppressing unnecessary radiation noise in the vicinity. FIG. 1 shows a schematic diagram of the microstrip line used. A linear conductor path is provided on the surface of the substrate, and the electromagnetic interference suppressing body 3 is disposed on the conductor path. Both ends of the conductor path are connected to a network analyzer, the reflection amount (S11) and the transmission (S21) are measured, and the transmission loss can be obtained by the following equation (1) from the difference between them.

伝送損失［％］＝｛１−［（γ）2＋（τ）2］｝×１００ ・・・・・（１）
ここで、反射量（Ｓ１１）＝２０ｌｏｇ｜γ｜、透過（Ｓ２１）＝２０ｌｏｇ｜τ｜である。また、γ：電圧反射係数、τ：電圧透過係数である。 Transmission loss [%] = {1-[(γ) 2 + (τ) 2 ]} × 100 (1)
Here, the reflection amount (S11) = 20 log | γ | and the transmission (S21) = 20 log | τ |. Further, γ is a voltage reflection coefficient, and τ is a voltage transmission coefficient.

上述したように本発明によれば、従来の電磁干渉抑制体よりも広帯域で不要輻射ノイズの抑制ができる軟磁性体粉末を用いた電磁干渉抑制体が提供できる。   As described above, according to the present invention, it is possible to provide an electromagnetic interference suppressor using a soft magnetic powder that can suppress unwanted radiation noise in a wider band than a conventional electromagnetic interference suppressor.

以下に本発明にかかわる実施の形態について図面を参照しながら説明する。   DESCRIPTION OF EMBODIMENTS Embodiments according to the present invention will be described below with reference to the drawings.

前記扁平状あるいは針状の軟磁性体としては、純鉄、鉄アルミ珪素合金、鉄ニッケル合金、アモルファス合金等を粉砕加工、延伸及び引裂加工、あるいはアトマイズ造粒などにより粉末化したものが挙げられる。   Examples of the flat or needle-like soft magnetic material include those obtained by pulverizing pure iron, iron aluminum silicon alloy, iron nickel alloy, amorphous alloy, etc. by pulverization, stretching and tearing, or atomization granulation. .

また、鉄酸化物を用いてもよく、例えばスピネル型フェライト、プレーナ型フェライト、ヘマタイト、マグネタイト、マグヘマイトなどがあげられる。   Further, iron oxide may be used, and examples thereof include spinel ferrite, planar ferrite, hematite, magnetite, and maghemite.

一方、有機結合剤としては、電子回路近傍での使用を考慮し、優れた可撓性及び難燃性を得ることが出きる塩化ポリエチレンが好ましいが、これに限定されるものではなく、これ以外にもポリエステル系樹脂、、ポリエチレン樹脂、ポリ塩化ビニル系樹脂、ポリビニルブチラール樹脂、ポリウレタン樹脂、セルロース系樹脂、ＡＢＳ樹脂、エチレン−酢酸ビニル共重合体、アクリロニトリル−ブタジエン系ゴム、スチレン−ブタジエン系ゴム、シリコンゴムなどの熱可塑性樹脂や熱可塑性エラストマー、エポキシ樹脂、フェノール樹脂、アミド系樹脂、及びイミド系樹脂などの熱硬化性樹脂などが挙げられる。   On the other hand, the organic binder is preferably chlorinated polyethylene, which can obtain excellent flexibility and flame retardancy in consideration of use in the vicinity of an electronic circuit, but is not limited thereto. Polyester resin, polyethylene resin, polyvinyl chloride resin, polyvinyl butyral resin, polyurethane resin, cellulose resin, ABS resin, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene rubber, styrene-butadiene rubber, Thermosetting resins such as thermoplastic resins such as silicone rubber, thermoplastic elastomers, epoxy resins, phenol resins, amide resins, and imide resins can be used.

前記軟磁性体と前記有機結合剤を混合して作製されたグリーンシートを積層して得られる電磁干渉抑制体は、厚さが１０〜１００μｍの薄型シートで使用するのが好ましい。より好ましくは２０〜５０μｍである。   The electromagnetic interference suppressor obtained by laminating green sheets prepared by mixing the soft magnetic material and the organic binder is preferably used as a thin sheet having a thickness of 10 to 100 μm. More preferably, it is 20-50 micrometers.

以下、実施例、比較例を挙げて本発明の電磁干渉抑制体を説明するが、本発明は以下の実施例に限定されるものではい。   Hereinafter, although the electromagnetic interference suppression body of the present invention will be described with reference to examples and comparative examples, the present invention is not limited to the following examples.

軟磁性体として、高周波透磁率特性の大きい鉄アルミニウム硅素合金（センダスト）を用いた。センダストは、球状、または、不定形状、の素粉末状態から、溶媒中で機械的に粉砕処理することにより扁平化された原料としている。ここでの軟磁性体は、Ｓｉが９．５重量％、Ａｌが５．５重量％、残分がＦｅ組成のＦｅ−Ｓｉ−Ａｌ合金を用いた。その粉末は、粉砕条件（時間）を変えることにより、粉末の粒径、アスペクト比等の粉末形状の要素を変えることにより得られる異方性磁界の違いによって、共鳴周波数の異なる粉末を作製した。今回得た粉末性状を表１に示す。   As the soft magnetic material, an iron aluminum silicon alloy (Sendust) having a large high frequency permeability characteristic was used. Sendust is a raw material that has been flattened by mechanically pulverizing it in a solvent from a spherical or indefinite shape powdered state. As the soft magnetic material, Fe-Si-Al alloy having 9.5 wt% Si, 5.5 wt% Al, and the balance Fe composition was used. As the powder, powders having different resonance frequencies were produced by changing the pulverization conditions (time), and by changing the anisotropic magnetic field obtained by changing the powder shape factors such as the particle diameter and aspect ratio of the powder. The powder properties obtained this time are shown in Table 1.

Figure 2008098392
Figure 2008098392

次に、表２の組成物をミキサーを用いて混合し、試料１及び試料２の複合磁性体用ペーストを作製した。試料１及び試料２のペーストをそれぞれ、ドクターブレード法により粉末を面内方向に配向させて所定の厚さで成膜し、図２の本発明においてグリーンシートを貼り合わせる説明図に示す１及び２のグリーンシートを作製した。   Next, the compositions shown in Table 2 were mixed using a mixer to prepare Sample 1 and Sample 2 composite magnetic material pastes. The pastes of Sample 1 and Sample 2 are formed in a predetermined thickness by directing the powder in the in-plane direction by the doctor blade method, respectively, and 1 and 2 shown in the explanatory diagram in FIG. A green sheet was prepared.

Figure 2008098392
Figure 2008098392

試料１のグリーンシートと試料２のグリーンシートを貼り合わせ、本発明の実施試料を作製した。本発明の一構成要素に用いている有機結合剤としては、塩素化ポリエチレン樹脂を使用しているが、その他の、ポリエステル系樹脂、ポリウレタン樹脂、エポキシ樹脂等、あるいはそれらの共重合体でも同様に成形できるため、塩素化ポリエチレンに限定されるものではない。   The green sheet of sample 1 and the green sheet of sample 2 were bonded together to produce an implementation sample of the present invention. As an organic binder used for one component of the present invention, a chlorinated polyethylene resin is used, but other polyester resins, polyurethane resins, epoxy resins, etc., or copolymers thereof are similarly used. Since it can be molded, it is not limited to chlorinated polyethylene.

また、本発明品と比較するため、従来品の比較例１及び比較例２を追加した。比較品１は、試料２単体での特性相当品であり、比較品２は、試料１単体での特性相当品である。   Moreover, in order to compare with the product of the present invention, Comparative Examples 1 and 2 of the conventional product were added. The comparative product 1 is a property equivalent product of the sample 2 alone, and the comparison product 2 is a property equivalent product of the sample 1 alone.

次に、作製した複合磁性体をＲＦインピーダンスアナライザーを用いて、透磁率（μ−ｆ）特性を測定した。本発明の電磁干渉抑制体の透磁率特性（μ−ｆ）特性を図３に示す。図４は、従来品の１００ＭＨｚ〜５ＧＨｚでの抑制効果が有効な比較例１の透磁率（μ−ｆ）特性を示し、図５は、１０ＭＨｚ〜３ＧＨｚで抑制効果が有効な比較例２の透磁率（μ−ｆ）特性を示す。   Next, the magnetic permeability (μ-f) characteristics of the produced composite magnetic material were measured using an RF impedance analyzer. FIG. 3 shows the permeability characteristic (μ-f) characteristic of the electromagnetic interference suppressor of the present invention. FIG. 4 shows the permeability (μ-f) characteristic of Comparative Example 1 in which the suppression effect at 100 MHz to 5 GHz of the conventional product is effective, and FIG. 5 shows the permeability of Comparative Example 2 in which the suppression effect is effective at 10 MHz to 3 GHz. Magnetic susceptibility (μ-f) characteristics are shown.

また、図６は、複合磁性体の電磁干渉抑制効果を検証するための評価装置の概略を示したものである。ここでは、厚さ０．５ｍｍで一辺が５０ｍｍの正方形の電磁干渉抑制体３を設置した。電磁干渉抑制効果の評価には、電磁界波源用発信器４を用いた波源用素子及び受信用素子として、ループ径１．５ｍｍの電磁界送信用微小ループアンテナ５及び電磁界受信用の微小ループアンテナ６を用い、結合減衰レベルの測定にはネットワークアナライザー７を用いた。ここでの、結合減衰レベルは、電磁干渉抑制体の有無の差を基準としたときの信号減衰量であり、減衰量の絶対値が大きいほど電磁干渉抑制効果が良いことを表している。本発明の電磁干渉抑制体と、従来品とを比較した結合減衰レベルの結果を図７に示す。   FIG. 6 shows an outline of an evaluation apparatus for verifying the electromagnetic interference suppression effect of the composite magnetic material. Here, a square electromagnetic interference suppressing body 3 having a thickness of 0.5 mm and a side of 50 mm was installed. For the evaluation of the electromagnetic interference suppression effect, as a wave source element and a receiving element using the electromagnetic wave source transmitter 4, an electromagnetic field transmitting micro loop antenna 5 having a loop diameter of 1.5 mm and an electromagnetic field receiving micro loop are used. An antenna 6 was used, and a network analyzer 7 was used to measure the coupling attenuation level. Here, the coupling attenuation level is a signal attenuation when the difference between the presence and absence of the electromagnetic interference suppressor is used as a reference, and the larger the absolute value of the attenuation, the better the electromagnetic interference suppression effect. FIG. 7 shows the result of the coupling attenuation level comparing the electromagnetic interference suppressor of the present invention and the conventional product.

また、高周波での電磁抑制効果を確認するため、ネットワークアナライザーを用いて、反射量（Ｓ１１）、透過量（Ｓ２１）を測定し伝送損失を確認した。伝送損失においては、伝送損失が高いほど、抑制効果が良いことを示している。本発明のについて、従来品と比較した伝送損失結果を図８に示す。前記の本発明の電磁干渉抑制体と、従来品とを比較した結果を表３に示す。   Moreover, in order to confirm the electromagnetic suppression effect in a high frequency, the amount of reflection (S11) and the amount of transmission (S21) were measured using the network analyzer, and the transmission loss was confirmed. For transmission loss, the higher the transmission loss, the better the suppression effect. FIG. 8 shows the transmission loss result of the present invention compared with the conventional product. Table 3 shows a result of comparison between the electromagnetic interference suppressor of the present invention and a conventional product.

Figure 2008098392
Figure 2008098392

表３より、以下に述べる効果が明確である。図３の透磁率（μ−ｆ）特性から、本発明は従来（図４及び図５）の電磁干渉抑制体と比較して不要輻射ノイズの抑制効果があるμ”の範囲が広くなっていることが確認できる。また、μ”が１０以上の周波数帯域を定量的に確認しても、従来の電磁干渉抑制体（比較例１及び比較例２）よりも広く分布していることが確認できる。よって、従来よりも広帯域で抑制できることが明確である。   From Table 3, the effects described below are clear. From the magnetic permeability (μ-f) characteristics of FIG. 3, the present invention has a wider range of μ ″ that has the effect of suppressing unwanted radiation noise than the conventional electromagnetic interference suppressor (FIGS. 4 and 5). In addition, even if the frequency band in which μ ″ is 10 or more is quantitatively confirmed, it can be confirmed that it is more widely distributed than the conventional electromagnetic interference suppressors (Comparative Example 1 and Comparative Example 2). . Therefore, it is clear that it can be suppressed in a wider band than before.

また、１００ＭＨｚ〜３００ＭＨｚでの信号減衰量の結果では、従来品の比較例２よりは若干劣っているが、比較例１よりも高い減衰量がある。また、５００ＭＨｚ〜２ＧＨｚでの伝送損失の結果では、比較例１と同等以上の損失があり、比較例２とは５００ＭＨｚで若干劣るも、１．５ＧＨｚ以上では本発明の方が、損失が高いことが確認できる。以上の結果から本発明は、従来の電磁干渉抑制体よりも広帯域で抑制効果が有効なのが明確である。   Moreover, although the signal attenuation amount at 100 MHz to 300 MHz is slightly inferior to the comparative example 2 of the conventional product, the attenuation amount is higher than that of the comparative example 1. In addition, as a result of transmission loss at 500 MHz to 2 GHz, there is a loss equal to or higher than that of Comparative Example 1 and slightly inferior to that of Comparative Example 2 at 500 MHz, but the loss of the present invention is higher at 1.5 GHz or higher. Can be confirmed. From the above results, it is clear that the suppression effect of the present invention is more effective in a wider band than the conventional electromagnetic interference suppression body.

本発明において、伝送損失を測定する際に使用した、マイクロストリップラインの概略図。The schematic of the microstrip line used when measuring the transmission loss in this invention. 本発明において、グリーンシートを貼り合わせる説明図。In this invention, explanatory drawing which bonds a green sheet together. 本発明の透磁率（μ−ｆ）特性図。The magnetic permeability ((micro | micron | mu) -f) characteristic view of this invention. 比較例１の透磁率（μ−ｆ）特性図。The magnetic permeability ((micro | micron | mu) -f) characteristic view of the comparative example 1. FIG. 比較例２の透磁率（μ−ｆ）特性図。The magnetic permeability (μ-f) characteristic diagram of Comparative Example 2. 本発明において、複合磁性体の電磁干渉抑制効果を検証するための評価装置の概略図。The schematic diagram of the evaluation apparatus for verifying the electromagnetic interference suppression effect of a composite magnetic body in this invention. 本発明と、比較例１、比較例２の結合減衰レベル特性図。The coupling attenuation level characteristic figure of this invention and the comparative example 1 and the comparative example 2. FIG. 本発明と、比較例１、比較例２の伝送損失特性図。The transmission loss characteristic figure of this invention and the comparative example 1 and the comparative example 2. FIG.

符号の説明Explanation of symbols

１ 試料１のグリーンシート
２ 試料２のグリーンシート
３ 電磁干渉抑制体
４ 電磁界波源用発信器
５ 電磁界送信用微小ループアンテナ
６ 電磁界受信用微小ループアンテナ
７ ネットワークアナライザー 1 Green Sheet 2 of Sample 1 Green Sheet 3 of Sample 2 Electromagnetic Interference Suppressor 4 Transmitter for Electromagnetic Wave Source 5 Micro Loop Antenna for Electromagnetic Field Transmission 6 Micro Loop Antenna for Electromagnetic Field Reception 7 Network Analyzer

Claims (3)

平均粒径、アスペクト比が異なる扁平状もしくは針状の粒子形状を有する軟磁性体粉末と有機結合剤とからなる２種類の複合磁性体を貼り合わせることにより、互いに異なる大きさの異方性磁界（Ｈｋ）によってもたされる磁気共鳴を少なくとも、２つ有することを特徴とする軟磁性体粉末を用いた電磁干渉抑制体。   Anisotropic magnetic fields with different magnitudes can be obtained by laminating two types of composite magnetic materials composed of soft magnetic powders having flat or needle-like particle shapes with different average particle diameters and aspect ratios and organic binders. An electromagnetic interference suppressor using soft magnetic powder, characterized by having at least two magnetic resonances provided by (Hk). 前記軟磁性体粉末は、鉄、鉄アルミニウム珪素合金、鉄ニッケル合金、アモルファス合金、鉄酸化物の少なくともいずれかであることを特徴とする請求項１に記載の軟磁性体粉末を用いた電磁干渉抑制体。   The electromagnetic interference using the soft magnetic powder according to claim 1, wherein the soft magnetic powder is at least one of iron, iron aluminum silicon alloy, iron nickel alloy, amorphous alloy, and iron oxide. Suppressor. 前記軟磁性体粉末は、配向されていることを特徴とする請求項１ないし請求項２に記載の軟磁性体粉末を用いた電磁干渉抑制体。   The electromagnetic interference suppressor using the soft magnetic powder according to claim 1, wherein the soft magnetic powder is oriented.
JP2006278418A 2006-10-12 2006-10-12 Electromagnetic interference suppressor using soft magnetic powder Pending JP2008098392A (en)

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