Development of Magnetoplunbite Type Ferrite Electromagnetic Absorber in the Frequency of GHz

GHz频率磁石型铁氧体电磁吸波体的研制

• 批准号: 11834002
• 负责人: KAGOTANI Toshio
• 金额: $ 2.24万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11834002/
• 关键词: M-type ferrite; EMI; electromagnetic absorber; comlex permeability; complex tranmittivity; magnetic resonance; 結晶配向; 反射ロス; R.L; 電磁波吸収体; フェライト; 反射損失; インピーダンス; マグネトプランバイト型; フェロックスプレナー型; 広帯域

Recentry Microwave radiation in the GHz band is increasingly being used in many various communication devices. However, this has brougt about the problem of electromagnetic interference (EMI). Now M-type Ba ferrite is expected to be used as a powerful countermeasure to EMI.Our recent works have shown that M-type Ba ferrite is a promising material for microwave absorber in the GHz range. The magnetic resonance absorption properties depend on the complex permeability μ=μ'-jμ" particularly the imaginary part μ"=Ms/2Haα. (Ms : saturation magnetization, Ha : anisotropic field α : extinction coef.) and the complex permissivity ε=ε'-jε". A high complex permeability μ" has been obtained in Ba Fe_<12-x> (Ti_<0.5>Mn_<0.5>)_xO_<27> compound. in which Fe^<3+> was substituted by (Ti_<0.5>Mn_<0.5>). And As hexagonal ferrite exhibits a uniaxial anisotropy, it may be expected that the microwave absorption properties would be enhaned if the sample are aligned using the press in magnetic field. In this … More study we used Mn(II) and Ti, Zr and Sn of Group IV as substitute for Fe^<3*> in BaFe_<12-x> (Me_<0.5>Mn_<0.5>)_xO_<27> : (Me : Ti, Zr, Sn) (x=0-4.0) compound. The sampls were prepared by conventional powder metallurgy method and were formed into toroidal shapes whose c-axis were aligned vertically to the sample thickness. Then we investigated the effects of saturation magnetization Ms and substitution composition (x) of Me for Fe^<3+> by Me ion (Me : Ti.Zr, Sn), on the electromagnetic absorption properties of the Ba Fe_<12-x> (Me_<0.5>Mn_<0.5>)_xO_<27> (Me : Ti, Zr, Sn) compound. The magnetic properties and the resonance absorption characteristics (μ', μ" etc) were measured using a VSM and a network analyzer. The aligned Ti-, Sn- an d Zr- substituted samples showed values of μ"=4.4, 5.1, 5.7 and matching thickness d_m=0.9mm, 0.6mm, 0.4mm, respectively. These μ" values is significantly larger than 3.8 for isotropic (TiMn)-substituted samples. It is therefore concluded thatt the metal ion substitution such as Ti, Sn, Zr and Mn and the c-axis alignment in hexagonal ferrite are effective in enhancing the electromagnetic wave absorption characteristics of M-type ferrite absorber. Less

GHz频段的微波辐射越来越多地用于各种通信设备中。然而，这带来了电磁干扰（EMI）的问题。M型钡铁氧体有望成为一种强有力的抗电磁干扰材料，我们最近的工作表明，M型钡铁氧体是一种很有前途的GHz波段微波吸收材料。磁共振吸收特性取决于复磁导率μ= UNF '-jμ”，特别是虚部μ"=Ms/2 Ha α。(Ms：饱和磁化强度，Ha：各向异性场，α：消光系数）复数ε= ε ′-jε"。在BaFe_<12-x>（Ti_<0.5>Mn_<0.5>）_xO_3<27>化合物中获得了高的复磁导率μ”。其中Fe^&lt;3+&gt;被（Ti_<0.5>Mn_<0.5>）取代。由于六方晶系铁氧体具有单轴各向异性，在磁场中采用压制法取向可以提高样品的微波吸收性能。在这 ...更多信息 研究了用Mn（Ⅱ）和IV族元素Ti、Zr、Sn代替BaFe_<12-x>（Me_<0.5>Mn_<0.5>）_xO_<27>：（Me：Ti，Zr，Sn）（x=0-4.0）化合物中的Fe ~（3+）。样品通过传统的粉末冶金方法制备，并形成为c轴垂直于样品厚度的环形形状。研究了饱和磁化强度Ms和Me离子（Me：Ti，Zr，Sn）取代Fe^&lt;3+&gt;的组成（x）对BaFe_<12-x>（Me_<0.5>Mn_<0.5>）_xO_<27>（Me：Ti，Zr，Sn）化合物电磁吸收性能的影响。用VSM和网络分析仪测量了样品的磁性能和共振吸收特性（NF '、μ”等）。Ti、Sn和Zr取代的样品的取向值分别为μ"=4.4、5.1、5.7和匹配厚度d_m=0.9mm、0.6mm、0.4mm。对于各向同性（TiMn）取代的样品，这些μ”值显著大于3.8。因此，在六方晶系铁氧体中引入Ti、Sn、Zr、Mn等金属离子和c轴取向，可有效地提高M型铁氧体吸波材料的电磁波吸收性能。少

项目成果

Y.Maeda, T.Kagotani, S.Sugimoto, M.Homma et al.: "Microwave Absorption Properties of Zn2-W type Ferrite (In Japanese)"Journal of Magnetics Society of Japan. vol.24, No.4-2 (Japanese). 895-898 (1999)

Y.Maeda、T.Kagotani、S.Sugimoto、M.Homma 等人：“Zn2-W 型铁氧体的微波吸收特性（日文）”日本磁学学会杂志。

H.Takabayasi,T.Kagotani,S.Sugimoto,M.Homma et al: "Effect of Crystallograraphic Alignment on the Microwave Absorption Properties of BaFe12-x (Ti0.5Mn0.5)xO19"Digests of The 8th International Conference on Ferrites. 60-60 (2000)

H.Takabayasi,T.Kagotani,S.Sugimoto,M.Homma 等人：“晶体排列对 BaFe12-x (Ti0.5Mn0.5)xO19 微波吸收性能的影响”第八届国际铁氧体会议摘要。

Y.Maeda,T.Kagotani,S.Sugimoto,M.Homma et al.: "GHz Range Electromagnetic Wave Absorption Properties of M and W-Type Two Phase Hexaferrite"Materials Transactions,JIM. vol.41No.5. 567-570 (2000)

Y.Maeda、T.Kagotani、S.Sugimoto、M.Homma 等人：“M 型和 W 型两相六角铁氧体的 GHz 范围电磁波吸收特性”Materials Transactions，JIM。

H.Takabayasi,T.kagotani,S.Sugimoto et al: "Effect of Crystallograraphic Alignment on the Microwave Absorption Properties of BaFe_<12-x>(Ti_<0.5>Mn_<0.5>)_xO_<19>"Proceeding of ICF 8. 181-122 (2000)

H.Takabayasi,T.kagotani,S.Sugimoto 等人：“晶体排列对 BaFe_<12-x>(Ti_<0.5>Mn_<0.5>)_xO_<19> 微波吸收性能的影响”ICF 8 论文集

前田與志亮,籠谷登志夫,杉本諭,本間基文 他4名: "Zn2-W型フェライトの電磁波吸収特性"日本応用磁気学会誌. vol.24No.4-2. 895-898 (1999)

Yoshiaki Maeda、Toshio Kagotani、Satoshi Sugimoto、Motofumi Honma 等 4 人：“Zn2-W 型铁氧体的电磁波吸收特性”日本应用磁学学会 vol.24No.4-2（1999）。