Electromagnetic Wave Absorber of Laminated Ferrite and Dielectrics

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J. Korean Ceram. Soc. > Volume 28(6); 1991 > Article

Journal of the Korean Ceramic Society 1991;28(6): 483.

페라이트-유전체 적층형 전파흡수체

김경용, 김왕섭, 주윤돈, 정형진

한국과학기술원 세라믹스 연구단

Electromagnetic Wave Absorber of Laminated Ferrite and Dielectrics

ABSTRACT

Ferrite electromagnetic wave absorber whose attenuation ability are mainly relied on their magnetic loss, has been used in relatively narrow wave frequency ranges. In this study, we tried to produce a wide-range electromagnetic wave absorber by laminating sintered ferrite (Mn0.07Ni0.28Zn0.65Fe2O4) and dielectrics (Cordierite). We also investigated effects of dielectric constant and thickness on the attenuation behavior of the absorber. Applicable band width, in which the attenuation is greater than 20 dB can be widened from 100∼700 MHz of ferrite alone to 100∼900MHz by employing the laminated structure. Thickness of dielectrics to achieve wide-range application decreased as the dielectric constant increased.