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J. Korean Ceram. Soc. > Volume 29(8); 1992 > Article
Journal of the Korean Ceramic Society 1992;29(8): 639.
고주파 대역 EMI 노이즈 필터 제조시 전자기적 특성에 미치는 첨가물 효과
박진채, 김병호, 김왕섭1, 김경용1
고려대학교 재료공학과
1한국과학기술연구원 세라믹공정실
Effect of Additives on Electromagnetic Properties in EMI Noise Filters for High Frequency Region
ABSTRACT
Effects of additives on electromagnetic properties of a Ni-Cu-Zn ferrite for a noise filter in high frequency regions were studied. Both resistivity and permeability were increased with the amount of Mn2O3 up to 1wt%, then decreased with further addition. Addition of Co2O3 decreased the permeability of the ferrite and shifted the resonance frequency to a higher frequency region, which was thought due to the stabilization of domain walls. Therefore it was possible to improve both the permeability and the loss and to control the cut-off frequency by the concurrent addition of Mn2O3 and Co2O3.
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