Electromagnetic Wave Absorbing Properties of Glass Fiber Reinforced Cement Composites with Special-Shaped Structure Surfaces

n order to reach high electromagnetic wave absorption property, here we developed a cement composites building materials. Special-shaped structure surfaces have been designed to make the continuity change of impedance and increase the incident times for electromagnetic wave. Different ratio of flexible glass fiber were introduced to adjust the impedance matching characteristics of the composites and to attenuate the incident wave by scattering. As the concentration of 9% glass fiber and the surface of rectangle, the reflectivity reached the highest in the absorber with 20mm thickness. the lowest reflection loss of-15.8 dB was obtained at 8.9GHz, and the effective absorption bandwidth (less than-8 dB) reached 12 GHz in the frequency range of 1.7~18 GHz. The new material can be used for building indoor electromagnetic radiation protection.