High temperature metamaterial enhanced electromagnetic absorbing coating prepared with alumina ceramic

At present, a series of challenges are impeding large-scale application high temperature radar absorbing coatings (RACs), such as complex preparation raw material and complicated technology processing. In this paper, we designed experimentally demonstrated high-temperature metamaterial RAC (MRAC) with strong absorption thin thickness, which is composite coating layer metamaterial. To avoid materials, pure alumina was selected the coating. Plasma spraying screen printing were employed to simplify sample produce layer, ensuring its feasibility practicality. The prepared conductive paste it improved impedance matching regulated electromagnetic (EM) resonance, allows more EM waves be absorbed. Therefore, excellent also achieved relatively small thickness. 800 °C, MRAC reflection loss (RL) below ?5 dB almost covered frequency 10–18 GHz thickness only 1.5 mm. This new has broad prospects by virtue simplicity convenience in manufacture.