Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Design and Analysis of Electromagnetic Wave Absorbing Structure Using Layered Composite Plates

적층 복합재 판을 이용한 전자기파 흡수 구조체의 설계

  • 오정훈 (한국과학기술원 기계공학과 항공우주공학전공) ;
  • 홍창선 (한국과학기술원 기계공학과 항공우주공학전공) ;
  • 오경섭 (한국과학기술원 전자공학과) ;
  • 김천곤 (한국과학기술원 기계공학과 항공우주공학전공) ;
  • 이동민 (국방과학연구소)
  • Published : 2002.04.01
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Abstract

The absorption and the interference shielding of the problems thor both commercial and military purposes. In this study, the minimization of the electromagnetic wale reflections using composite layers with different dielectric properties was performed. Dielectric constants were measured for glass/epoxy composites containing conductive carbon blacks and carbon/epoxy fabric composites. Using the measured permittivities of the composites having various carbon black contents, the optimal electromagnetic wave absorbing structure in X-band(8.2GHz-12.4GHz) was determined. The optimal multi-layered composite plates have the thickness of 2.6mm. The maximum reflection loss is -30dB at 10GHz, and the bandwidth haying the absorptivity lower than -l0dB is about 2GHz.

군사적 목적뿐만 아니라 상업적 목적에서도 레이더나 기타 전자파를 방출하는 기기들로부터 생성되는 전자파의 흡수 또는 차폐는 매우 중요한 일이다. 본 연구에서는 다른 유전적 성질을 가지는 복합재층을 배열하여 전자기파의 반사를 최소화하는 연구를 수행하였다. Glass fabric/epoxy에 전도성을 가지는 카본블랙 분체를 혼합한 복합재와 Carbon fabric/epoxy 복합재 대만 유전성질을 측정하였고, 이를 이용하여 X-band(8.2 GHz-l2.4GHz)에 대한 전자기파 반사의 최소화 구조를 구성하였다. 두께2.6mm의 다층 구조로 최대 30dB 이상의 반사 손실과 최대 흡수 주파수로부터 2GHz 주파수 대역에 걸쳐 10dB이상의 반사손실을 일으킬 수 있었다.

Keywords

References

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