Phase random metasurfaces for broadband wide‐angle radar cross section reduction

Ultrathin phase random metasurfaces (PRMSs) for reducing radar cross section (RCS) over a wide range of frequencies and incident angles are presented. The PRMSs are formed by arraying disk‐shaped metal patches of random sizes on an ultrathin grounded dielectric layer. The electromagnetic wave incident on the PRMS feels a rough surface due to the random phase value of each inclusion. The energy is then redirected irregularly and thus the backward RCS reduction in the specular direction can be achieved. The bandwidth of RCS reduction can be broadened by expanding the distribution interval of the metal patch sizes. The experimental validation is performed and the measured result shows an acceptable agreement with the corresponding simulation.