Magnetic foams from polyurethane and magnetite applied as attenuators of electromagnetic radiation in X band

In this work, electromagnetic radiation absorbent materials (ERAM) were prepared from expanded polyurethane and nano-Fe3O4. The effect of porosity and charge content on the attenuation of incident radiation was investigated using helium gas pycnometry and the waveguide technique in the frequency range of 8 to 12 GHz (X-band).