Abstract
A gradient honeycomb absorber with a layer of carbon-based conductive coating was developed in this work. The geometrical parameters and EM performance were investigated through both numerical simulation and free-space measurement. It is found from measurement results that honeycomb absorber has good absorption properties within frequency from 18 to 40 GHz, and superior power handling capability up to 5 kw/m2. The reflectivity over the whole frequency band is better than − 43 dB. Also, the numerical simulation achieves sound agreement with the free-space measurement. It can be promising candidate for measurement chambers of 5G millimeter phase-array antenna which needs to withstand high radiation power and high temperature.
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