Fabrication on a Recycled and Wide-Band Absorber by 3D Printing

A recycled novel hollow pyramid absorbing structure added the carbonyl iron particles (CIPs) and FeSiAl was fabricated in the 3D printing process. The printed wires added the CIPs in the printer were made by the extruder. The electromagnetic parameters of the printed wires were measured in the vector network analyzer. The density of the composite could be controlled by setting the filling ratio in the printing process. The permittivity and permeability of the hollow composite were derived and then the reflection loss of the composite could be simulated. The results showed the pyramid absorbing material had the good absorbing property, and as the FeSiAl plate was the substrate the absorbing property in the low frequency 2-4GHz could be improved while the absorbing property in the high frequency 4-18GHz was better. The frequency band (RL<-10 dB) could be widened to 2.7-18 GHz with filling ratio 70% and the density could be decreased from 4.24 g/cm2 to 3.08 g/cm2, the total thickness of the pyramid was only 59.71mm.