Barium M-type Ferrite as an Electromagnetic Microwave Absorber in the GHz Range
Barium M-type Ferrite as an Electromagnetic Microwave Absorber in the GHz Range
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DOI：
10.2320/matertrans1989.39.1080
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发表时间：
1998-10
期刊：
影响因子：
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通讯作者：
S. Sugimoto;K. Okayama;S. Kondo;H. Ota;M. Kimura;Y. Yoshida;Hajime Nakamura;D. Book;T. Kagotani
中科院分区：
文献类型：
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作者：
S. Sugimoto;K. Okayama;S. Kondo;H. Ota;M. Kimura;Y. Yoshida;Hajime Nakamura;D. Book;T. Kagotani
研究了（Ti0.5Mn0.5）3+取代Fe 3+后的钡M型铁氧体在GHz频段的电磁吸波性能。通过改变Ti0.5Mn0.5含量，可以改变钡M型铁氧体的各向异性场（HA），从而可以在48 ~ 8 GHz范围内控制固有谐振频率（fr）。BaFe 12-x（Ti0.5Mn0.5）xO 19烧结铁氧体（x=2.5 ~ 5）具有良好的微波吸收性能，其反射损耗（R.L.）在1 ~ 20 GHz频率范围内，当匹配厚度（dm）为0.5 ~ 3.8mm时，其带宽小于-20dB。< -20 dB。特别地，具有组成x=3和x=4的复合材料样品具有14.1至12.0GHz和7.4至12.0GHz的宽带宽，对于匹配厚度1。6 mm和2.7mm。这些匹配厚度小于常规尖晶石铁氧体。可以得出结论，钡M型铁氧体是一个很好的候选人薄的电磁微波吸收器在GHz范围内。这是第一次研究表明，有可能利用M型铁氧体的自然共振吸收微波辐射。
The electromagnetic microwave absorption properties of Barium M-type ferrite, in which Fe 3+ was substituted by (Ti 0.5 Mn 0.5 ) 3+ , were investigated in the GHz frequency range. The anisotropy field (H A ) of Barium M-type ferrite can be changed by varying the Ti 0.5 Mn 0.5 content, which enables the natural resonance frequency (fr) to be controlled, in the range 48 GHz to 8 GHz. BaFe 12-x (Ti 0.5 Mn 0.5 ) x O 19 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. BaFe 12-x (Ti 0.5 Mn 0.5 ) x O 1 ferrite-resin composites with 70 mass% ferrite, exhibited wide bandwidths with R.L. < -20 dB. In particular, the composite samples with compositions x=3 and x=4 had wide bandwidths of 14.1 to ∼ 20 GHz and 7.4 to 12.0 GHz, for matching thicknesses of 1. 6 mm and 2.7 mm, 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. This is the first study to show that it is possible to use the natural resonance of M-type ferrite for the absorption of microwave radiation.