Effect of Additives on Electromagnetic Properties in EMI Noise Filters for High Frequency Region

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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.