GHz Electromagnetic Wave Absorption of Hexa and M-type Ferrite

六角和M型铁氧体的GHz电磁波吸收

基本信息

批准号：
09450254
负责人：
HOMMA Motofumi
金额：
$ 7.87万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

Purpose : Recently, wireless communication tools such as mobile telephones and computer local area networks (LAN), have become very popular. However, as the number of systems using high frequency electromagnetic waves has increased, serious electromagnetic compatibility (EMC) problems have become apparent. This has led to the search for electromagnetic wave absorption materials for the use in the GHz range. In this study, the electromagnetic microwave absorption properties of Barium Hexa and M-type ferrite, in which FeィイD13+ィエD1 was substituted by (MeィイD20.5ィエD2MnィイD20.5ィエD2)ィイD13+ィエD1(Me=Sn, Ti, Zr), were investigated in the GHz frequency range.Experimental Procedure : Sintered samples were prepared by conventional powder metallurgy and composite samples were prepared by crushing these sintered bodies into powders (< 300μm) and mixing with an epoxy resin at different ratios from 40 to 80 mass%. The phases present in the samples were characterized by X-ray diffraction (XRD). The magnet … More ic properties were measured using a VSM and a magnetic balance. The electromagnetic wave absorption properties were measured using a Hewlett-Packard HP8510C network analyzer in the frequency range 0.05 to 20.05 GHz.Results : The anisotropy field (HィイD2AィエD2) of Barium M-type ferrite can be changed by varying the TiィイD20.5ィエD2MnィイD20.5ィエD2 content, which enables the natural resonance frequency (fr) to be controlled, in the range 48 GHz to 8 GHz. BaFeィイD212-xィエD2(TiィイD20.5ィエD2MnィイD20.5ィエD2)ィイD2XィエD2OィイD219ィエD2 sintered ferrites with compositions x = 2.5 to 5 exhibited good microwave absorption properties, with minimum reflection losses (R.L.) less than -20 dB in 1 to 20 GHz frequency range, for matching thicknesses (dm) of 0.5 to 3.8 mm. The ferrite-resin composites with 70 mass% ferrite, exhibited wide bandwidths with R.L. < -20dB. In particular, the composite samples with compositions x = 3 and x = 4 had wide bandwidths of 14.1 to 〜20GHz and 7.4 to 12.0 GHz, for matching thicknesses of 1.6 mm and 2.7mm, respectively. These matching thicknesses were smaller than for conventional spinel ferrites. It may be concluded that Barium M-type ferrite is a good candidate for a thin electromagnetic microwave absorber in the GHz range. Less

目的：最近，无线通信工具（例如移动电话和计算机局域网（LAN））变得非常流行。但是，随着使用高频电磁波的系统数量增加了，严重的电磁兼容性（EMC）问题变得显而易见。这导致寻找用于GHz范围内使用的电磁波抽象材料。在这项研究中，hexa和M型铁矿的电磁微波抽象特性，其中FEI D13+IE D1被（MEI D20.5IE D2MNIE D20.5IE D2）代替，IE D13+IE D1（ME = SN，TI，ZR）在ghz中进行了调查：sin.sex频率范围。通过将这些烧结的物体粉碎成粉末（<300μm），并与环氧树脂以不同比率从40到80质量％粉碎，制备常规粉末冶金和复合样品。样品中呈现的相具有X射线衍射（XRD）的特征。磁铁…使用VSM和磁性平衡测量了更多的IC特性。使用频率为0.05至20.05 ghz的频率范围内的惠普（Hp8510c）网络分析仪测量电磁波抽象的性能：含量M型铁矿的各向异性场（HII D2AIE D2）可以通过对TII D20.5E D20.5E D20.5 d20.5 d20.5 d2 d20 ry依次更改在48 GHz至8 GHz范围内要控制的频率（FR）。 BAFE D212 -XIE D2（TII D20.5E D2MNI D20.5E D2）II D2XIE D2XIE D2XOI D219E D2带有组成X = 2.5至5的烧结的铁素体烧结的铁矿，5至5个暴露良好的微波遭受良好的遭受良好的微波遭受性能，较小的反射率（r.l. r.l. r.l. r.l. r.l. r.l.20 dhz），1至20 dhz，1至20 dhz，1至20 dhz，1至20 db至3.8毫米。具有70％质量％铁氧体的铁氧体 - 黄星组成，带有R.L. <-20dB的宽带宽带。特别是，具有组成X = 3和X = 4的复合样品的带宽分别为14.1至〜20GHz和7.4至12.0 GHz，分别为1.6 mm和2.7 mm的匹配厚度。这些匹配的厚度比传统的尖晶石铁氧体小。可以得出的结论是，钡M型铁氧石是GHz范围内薄电磁微波吸收器的良好候选者。较少的