A 3-D Ultra-broadband Lightweight Metamaterial Absorber Based on Resistive Film with Metallic Strips

In this paper, an ultra-broadband lightweight 3-D absorber operating in UHF band to Ku band is proposed. The 3-D structure is formed by two dielectric substrates, which are cross-spliced, and resistive films with metallic strips are introduced to the surface of the dielectric substrates in order to realize the expansion of low-frequency absorption. The results of full-wave simulation show that the MM can absorb more than 90% of the incident wave energy in the range of 0.81 ~ 18 GHz, the relative bandwidth is 182.78%. To improve absorption ability, a multi-layer horizontal resistive film structure is introduced at the bottom, and the absorption depth at 2.61GHz is increased by 1.42 dB. The fault tolerance of the structure is improved.