TY - JOUR
T1 - Barium M-type ferrite as an electromagnetic microwave absorber in the GHz range
AU - Sugimoto, Satoshi
AU - Okayama, Katsumi
AU - Kondo, Sin Ichi
AU - Ota, Hiroyasu
AU - Kimura, Masafumi
AU - Yoshida, Yoshiyuki
AU - Nakamura, Hajime
AU - Book, David
AU - Kagotani, Toshio
AU - Homma, Motofumi
PY - 1998/10
Y1 - 1998/10
N2 - The electromagnetic microwave absorption properties of Barium M-type ferrite, in which Fe3+ was substituted by (Ti0.5Mn0.5)3+, were investigated in the GHz frequency range. The anisotropy field (HA) of Barium M-type ferrite can be changed by varying the Ti0.5Mn0.5 content, which enables the natural resonance frequency (fr) to be controlled, in the range 48 GHz to 8 GHz. BaFe12-x(Ti0.5Mn0.5)xO19 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. BaFe12-x(Ti0.5Mn0.5)xO19 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.
AB - The electromagnetic microwave absorption properties of Barium M-type ferrite, in which Fe3+ was substituted by (Ti0.5Mn0.5)3+, were investigated in the GHz frequency range. The anisotropy field (HA) of Barium M-type ferrite can be changed by varying the Ti0.5Mn0.5 content, which enables the natural resonance frequency (fr) to be controlled, in the range 48 GHz to 8 GHz. BaFe12-x(Ti0.5Mn0.5)xO19 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. BaFe12-x(Ti0.5Mn0.5)xO19 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.
KW - Bandwidth
KW - Barium M-type ferrite
KW - Electromagnetic wave absorber
KW - Matching thickness
KW - Natural resonance
KW - Reflection loss
KW - Substitutional elements
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U2 - 10.2320/matertrans1989.39.1080
DO - 10.2320/matertrans1989.39.1080
M3 - Article
AN - SCOPUS:0032183758
VL - 39
SP - 1080
EP - 1083
JO - Materials Transactions
JF - Materials Transactions
SN - 1345-9678
IS - 10
ER -