An ultra-wideband polarization conversion meta-surface and its application in RCS reduction

In this paper, a novel meta-surface with polarization conversion characteristic in an ultrawide band is proposed. Based on the principle of the reflected wave cancelation, the proposed metasurface is distributed as a checkerboard to obtain an ultra-wideband radar cross section (RCS) reduction, resulting from the out-of-phase difference in normal incidence. The relationship between the polarization conversion ratio (PCR) and RCS reduction is investigated and verified by the simulation. Finally, a sample is fabricated and measured in an anechoic chamber. Compared to the metal board with same size, a 5 dB RCS reduction is achieved ranging from 3.7GHz to 15.9GHz, which indicates a fractional bandwidth of 124.5%. Moreover, the size of the unit cell is only 0.125?0 × 0.125?0 × 0.059?0, where ?0 is corresponding to the lowest frequency, namely 3.7 GHz, indicating the merits of miniaturization and low profile. Experiment results are in good agreement with the simulated ones, which demonstrates the validity of the proposed strategy.