Electromagnetic wave absorbing properties of SiC-foams and their composites with SiO2 as matrix are presented, including theory, numerical analysis, and results/discussion. The reflection coefficients of various SiC-foams and their composites with various dielectric parameters are calculated by numerical simulation. When SiC conductivities are in the range of 2-3 S m(-1) in the case of SiC-foams, or 2-5 S m(-1) in the case of composites, the minimum reflection coefficients can be obtained in the range of X-band of 8.2-12.4 GHz. These materials are light weight, heat-resistant, and good impedance match with the free space, and therefore, they are a good candidate as a wide-range frequency absorbent medium. (c) 2006 Published by Elsevier Ltd.
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