Influence of absorbent on electromagnetic wave absorbing property of porous concrete

Influences of ferrite content and iron ore powder content on electromagnetic wave absorbing property of porous concrete are studied.The radar cross section（RSC）of samples was tested in a microwave anechoic chamber.Results show that the optimum content of ferrite is 15%,and the minimum,maximum and average reflectivity of the sample is-46.60 dB,-10.84 dB and-23.75 dB,respectively.And the sample＇s improved bandwidth is 8.2 GHz.The optimum content of iron ore powder is 20%,and the minimum,maximum and average reflectivity of the sample is-34.69 dB,-9.25 dB and-20.69 dB,respectively.And the sample＇s improved bandwidth is 6 GHz.In conclusion,appropriate ferrite and iron ore powder can improve wave absorbing property and widen wave absorption bandwidth of porous concrete.