The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Analysis of Properties of Flake Sendust EM Wave Absorber according to Granularity

입도에 따른 Flake Sendust 전파 흡수체의 특성 분석

  • Park, Soo-Hoon (Department of Radio Communication Engineering, Korea Maritime University) ;
  • Kim, Dong-Il (Department of Radio Communication Engineering, Korea Maritime University) ;
  • Choi, Dong-Han (Department of Radio Communication Engineering, Korea Maritime University) ;
  • Kim, Seong-Yeon (Research Institute of Industrial Technology, Korea Maritime University)
  • 박수훈 (한국해양대학교 전파공학과) ;
  • 김동일 (한국해양대학교 전파공학과) ;
  • 최동한 (한국해양대학교 전파공학과) ;
  • 김성연 (한국해양대학교 산업기술연구소)
  • Published : 2008.09.30
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Abstract

In this paper, we analyzed the characteristics of the EM wave absorber which was fabricated by using flake sendust (soft metal magnetic powder). The flake sendust was made of 3 different granularity by attrition mill. First, we have fabricated 3 kind of EM wave absorbers using the flake sendust and CPE(Chlorinated Polyethylene) and measured the S-parameters of the EM wave absorber. The complex relative permittivity and permeability were calculated from the measured data and the variations according to a change of granularity were researched. As a result, it was confirmed that the EM wave absorber using flake sendust with the $140{\mu}m$ average granularity has outstanding absorption ability in high frequency range(C band) for the reduction of eddy current loss(increase of permeability) and the increase of space charge polarization(increase of permittivity).

본 논문에서는 연자성 금속 분말인 sendust를 flake화 과정을 통하여 형상과 입도를 변화시켜 전파 흡수체를 제작하고, 그 특성을 분석하였다. 먼저 attrition milling에 의해 입도를 달리한 세 종류의 flake sendust 분말과 지지 재인 CPE(Chlorinated Polyethylene)를 이용하여 전파 흡수체를 제작하고, 이 전파 흡수체로부터 재료 정수를 계산하여 입도에 따른 변화를 조사한 후 전파 흡수능을 측정하여 비교 분석하였다. 그 결과 평균 입도가 $140{\mu}m$인 flake sendust 분말로 제작된 전파 흡수체가 와전류 손실의 감소(복소비 투자율 증가)와 입자간의 정전 용량의 증가(복소비 유전율 증가)에 기인하여 고주파 대역에서 우수한 전파 흡수능을 보임을 확인하였다.

Keywords

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