샌드위치 구조의 전자기파 흡수체 제작 및 전자기적 특성Fabrication and Electromagnetic Characteristics of Electromagnetic Wave Absorbing Sandwich Structures

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The object of this study is to design the radar absorbing structures (RAS) having sandwich structures in the X-band (8.2-12.4 GHz) frequencies were designed and fabricated. We added conductive fillers such as carbon black and multi-walled carbon nanotube (MWNT) to composite prcpregs and polyurethane foams so as to efficiently increase the absorbing capacity of RAS. In order to improve the mechanical stiffness of RAS, we adopted the sandwich structures made of composite face sheets and foam cores. Glass fabric/epoxy composites containing conductive carbon black and carbon fabric/epoxy composites were used for the face sheets. Polyurethane foams containing MWNT were used as the core material. Their permittivity in the X-band was measured using the transmission line technique. The reflection loss characteristics for multi-layered sandwich structures were calculated using the theory of transmission and reflection in a multi-layered medium. Three kinds of specimens were fabricated and their reflection losses in the X-band were measured using the free space technique. Experimental results were in good agreement with simulated ones in 10-dB absorbing bandwidth.
Publisher
한국복합재료학회
Issue Date
2004
Keywords

X-band(8.2~12.4GHz) frequencies; Permittivities; RAS(Radar Absorbing Structures); Sandwich structures; Reflection loss

Citation

한국복합재료학회 2004년 춘계학술대회, pp.131-134

URI
http://hdl.handle.net/10203/10134
Link
http://www.kscm.re.kr/
Appears in Collection
AE-Journal Papers(저널논문)
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