Abstract
Cement-based composites with periodic wedge-shaped surfaces were manufactured by molding, and its microwave absorbing properties (MAPs) were measured in 1.7–18 GHz using arch method and simulated in 8–18 GHz. The results indicate that the MAPs of the composite in both polarization directions (PDs, perpendicular polarization, and parallel polarization) are improved greatly by the wedge structures. The higher the frequency is, the better the MAPs are especially in parallel PD. Large wedge height and large carbon black (CB) content enhance the MAPs of the composite, and enlarging the height is an effective method to enhance the MAPs in the low frequency range. When composites are filled with lightweight fillers, there is a slight decrease in the MAPs in parallel PD. The reflectivity is below − 10 dB in 3.7–18 GHz when the wedge height is 40 mm and CB is 1.5 g/L in both PDs. The excellent impedance matching caused by physical gradients and multiple reflections between wedges enhanced attenuation.
Published Version
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