GHz Electromagnetic Wave Absorption of Hexa and M-type Ferrite

目的：最近的无线通信工具可用作移动电话和计算机局域网（LAN），这已成为非常流行的。However，即使用高频率电磁波的系统数目增加，串行电磁兼容性（EMC）问题已成为设备。这是为了搜索在GHz范围内的电磁波吸收材料的使用。在本研究中，Barium Hexa和M型ferite的电磁微波吸收特性，其中Fe-D13 + Fe-D1被修改。（MeイD20.5イD2MnイD20.5イD2）イD13+イD1（Me=Sn， Ti， Zr），在GHz频率范围内进行了调查。实验程序：沉积样品是由常规粉末冶金准备的，复合样品是由粉碎这些沉积物制成的（< 300微米）并与环氧树脂混合，以不同的比率从40 - 80质量%。由X射线干扰（XRD）表征的样本中的相位。The Magnet ... More IC属性使用VSM和磁平衡进行了测量。电磁波吸收特性使用惠普HP 8510 C网络分析仪在频率范围0.05至20.05 GHz之间进行了测量。结果：另一种类型的田野（H-D2A-D2） of Barium M-type ferrite can be changed by varying the Ti-D20.5-D2Mn-D2 content， which enables the natural resonance frequency （fr） to be controlled，在48 GHz至8 GHz的范围内。BaFe型D212-x型D2（Ti型D20.5型D2 Mn型D20.5型D2）型D2 X型D2 O型D219型D2带有组合物x = 2.5至5的良好微波吸收特性，具有最小反射损失（R.L.）小于-20分贝，在1至20千兆赫的频率范围内，匹配0.5至3.8毫米的厚度（dm）。铁树脂复合材料有70质量%铁，宽带宽有R.L.。<20分贝。在具体情况下，组合样本与组合物x = 3和x = 4具有14.1至20 GHz和7.4至12.0 GHz的宽带宽，对应于1.6毫米和2.7毫米的厚度。这些匹配的厚度要比传统的螺旋桨小。这可能包括钡M型ferrite是GHz范围内的薄电磁微波吸收器的一个很好的候选人。Less（低）

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