A Study on Electromagnetic Absorption Characteristics of the Anisotropic Composite Structure with Specific Thickness

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Journal of the Korea Institute of Military Science and Technology 1998;1(1):114-127.

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특정두께를 갖는 이방성복합재 구조의 전자파 응답특성 연구

정헌달, 김덕주, 이윤상

국방과학연구소

Abstract

A user friendly computer code(EMCOMST; Electro-Magnetic response for COMposite STructures) was developed which provides with computations of the response characteristics such as reflectance and transmittance to the incident wave angles, frequencies, composite thicknesses, ply orientations, and types of backplate as the linearly polarized transverse electro-magnetic wave is emitted to the advanced composite structures. In this investigation were reviewed the electromagnetic characteristics of the continuous orthotropic fiber-reinforced organic matrix composites with or without ferrite fillers, which are actively applied to low-weight and high-strength aircraft structures. Also were calculated the response of the three layered compound structures which have appropriately stacked above-mentioned materials as transmitting layer, absorbing layer, reflection layer, respectively under the specific thickness constraints for mechanical strength design requirements. For the composite structures presented in this study, minimum reflectance value less than -5㏈ can be obtained in the frequency range of 4 to 12 ㎓. In addition, analysis of structures attached isotropic radar absorbing materials(RAM) is facilitated by putting the material properties in the material input card entries adequately.

Key Words: Electromagnetic wave, Dielectrics, Orthotropic, Reflectance, Transmittance, Reflection Loss