Ultra-wideband polarization-insensitive microwave absorber with a composite of CIP and TPU

This paper presents an ultra-wideband microwave absorber with a composite of carbonyl iron powder (CIP) and thermoplastic polyurethane (TPU) material and a wide-angle absorption stacked cross structure. The simulation results show that although the total thickness is less than 3.21[Formula: see text]mm, the proposed device can achieve high absorption (over 90%) in the range of 7.55–100[Formula: see text]GHz, and the total bandwidth is 92.45[Formula: see text]GHz, with a relative bandwidth of 172%. In addition, the absorber is insensitive to the polarization characteristics of incident electromagnetic waves and can achieve a wide incident angle absorption of up to 60 ∘ .