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http://dx.doi.org/10.5139/JKSAS.2004.32.6.064

A Study on Electromagnetic Wave Absorbing Sandwich Structures  

Park, Ki-Yeon (한국과학기술원 기계공학과 대학원)
Lee, Sang-Eui (한국과학기술원 기계공학과 대학원)
Kim, Chun-Gon (한국과학기술원 기계공학과)
Lee, In (한국과학기술원 기계공학과)
Han, Jae-Hung (한국과학기술원 기계공학과)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.32, no.6, 2004 , pp. 64-71 More about this Journal
Abstract
The object of this study is to design the Radar Absorbing Structures (RAS) having sandwich structures in the X-band ($8.2{\sim}12.4GHz$) frequencies. Glass fabric/epoxy composites containing conductive carbon blacks and carbon fabric/epoxy composites were used for the face sheets. Polyurethane(PU) foams containing multi-walled carbon nanotube (MWNT) were used for the core. Their permittivities in the X-band were 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 agreements with simulated ones in 10dB absorbing bandwidth.
Keywords
X-band frequencies; Permittivities; RAS; Sandwich Structures; Reflection loss;
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