Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Microwave absorbption characteristics of Ferrite/Rubber 0-3 Composites

Ferrite/Rubber 0-3 Composite의 전파 흡수 특성

  • Kim, H.G. (Dept. of Electrical Engr., Dong-A Univ.) ;
  • Park, S.H. (Dept. of Electrical Engr., Dong-A Univ.) ;
  • Cho, H.C. (Dept. of Electrical Engr., Dong-A Univ.) ;
  • SaGong, G. (Dept. of Electrical Engr., Dong-A Univ.)
  • 김한근 (동아대학교 공과대학 전기공학과) ;
  • 박상하 (동아대학교 공과대학 전기공학과) ;
  • 조현철 (동아대학교 공과대학 전기공학과) ;
  • 사공건 (동아대학교 공과대학 전기공학과)
  • Published : 1992.07.23
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Abstract

In this paper, the permeability ($\mu_{\tau}'$, $\mu_{\tau}''$), dielectric constants($\varepsilon_{\tau}'$, $\varepsilon_{\tau}''$) and absorbption characteristics of Ferrite/Rubber 0-3 composites were investigated. The composite specimens were prepared by molding and curing the mixtures of matrix rubber and Ni-Zn ferrite powders which were synthesized by wet-direct method. The permeability ($u_{\tau}'$) of specimen was decreased from 2.58 to 0.7 in the range of 1$\sim$7(GHz) and kept constant 0.7$\sim$0.8 at higher than 7(GHz), the higher the frequency was, the less the valves of $u_{\tau}"$ was from 1.57 to 0.03. The optimum thickness of microwave absorber, utilizing the Smith chart, was 5(mm). The reflection loss shows over than 20(dB) from 5.5(GHz) to 7.5(GHz) at 5(mm) thickness and relative band width(B/fm) was about 30%.

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