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Ni₂-xZnxY - 고무 복합체의 복소투자율과 전파흡수특성
신재영(J. Y. Shin),오재희(J. H. OH),권형주(H. J. Kwon) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
The microwave absorbing characteristics and complex permeability of Ni_(2-x)Zn_xY-rubber composites with variation of composition and particle size were investigated. With a ferrite particle with a diameter of about 1 ㎛, only spin rotational resonance was observed. This behavior probably due to the particle being sufficiently small to approach single domain characteristics so that only spin rotations can occur. The first matching frequency, found in Ni_(2-x)Zn_xY-rubber composites, which was higher than that of spin rotational resonance, increased with spin rotational resonance frequency. It is also found that the second matching frequency is independent of spin rotational resonance frequency. Based on these findings, it could be concluded that the microwave absorbing characteristics were caused by only one type of resonance, the spin rotational resonance.
Ferrite - Iron - Rubber 복합체의 전파흡수특성
신재영(J. Y. Shin),오재희(J. H. Oh) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.3
Wide-band absorbency and small layer thickness are required in the high- performance microwave absorber. In order to reduce the thickness of the absorber, ferrite-iran-rubber composites were proposed and its properties were investigated. The increase in both real part of permeability and permittivity of the composites Were observed with addition of -Fe powder and this behavior results in the decrease of fin fm term The matching thicknesses of ferrite-iron-ruber composites were relatively small(0.5 ~ 2.0 ㎜) in the frequency range of 3~17 ㎓ as compared to than that of ferrite-rubbr composit.
복합 ferroxplana 전파흡수체의 재료정수와 전파흡수 특성
신재영(J. Y. Shin),오재희(J. H. Oh) 한국자기학회 1991 韓國磁氣學會誌 Vol.1 No.2
In this study the correlation between material constants and microwave absorbing characteristics of ferroxplana composite microwave absorber used in X-band was investigated.<br/> The real part of permeability(μ_r´) was decreased and the imaginary part of permeability(μ_r˝) of ferroxplana composite was increased with increaing ferroxplana loading ratio(F/R). The frequency showing maximum attenuation was shifted to lower frequency with increasing absorber thickness. The absorber 2.6 ㎜ thick showed good band width property and 3.2 ㎜ thick showed good attenuation property. From the application of ferroxplana composite's material constants to the region of material constants which satisfy broad band width, it is found that the absorbing characteristics were estimated quantitatively. Establishment of material constants' region which satisfies broad band width can make practical application to design of high performance ferrite microwave absorber.
제조 공정 Parameter에 따른 NiCuZn Ferrite의 투자율과 Qmax 주파수 변화
신재영(J. Y. Shin),박지호(J. H. Park),박진채(J. C. Park),한종수(J. S. Hahn),송병무(B. M. Song) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.1
Composition and process conditions for low temperature sintered NiCuZn ferrites were investigated, so as to fabricate multilayered chip inductor. The Fe₂O₃ deficiency for low temperature sintering was decreased with NiO contents of NiCuZn ferrites. The permeability of NiCuZn ferrites can be controlled in the range of 12~562 with the variation of NiO and Co₃O₄ contents. The Qmax frequency of NiCuZn ferrites was decreased from 50 ㎒ to 3 ㎒ linearly with permeability increase from 60 to 560. The relation between the Qmax frequency(Y) and permeability (X) of NiCuZn ferrites was expressed with the following empirical equation, logY=4.2-1.4 logX.