Polarization Conversion Metasurface for Broadband Radar Cross Section Reduction

A novel polarization conversion metasurface (PCM) is proposed and applied to radar cross section (RCS) reduction. The proposed design has the advantage of simple geometry while simultaneously reducing RCS over broadband. The metasurface is created by the combination of an oblique split ring resonator (SRR) and a cut-wire resonator, which is capable of converting a linear polarization state into its orthogonal one. The simulation results show that the 10 dB bandwidth of polarization conversion is obtained in wideband from 9.4 to 19.2GHz, with an average polarization conversion ratio (PCR) of nearly 100%. Due to the high PCR, RCS reduction of 10 dB can be realized over 60% frequency bandwidth with respect to the equal-sized PEC ground plane. The maximum reduction is 32.8 dB. To validate the simulation results, prototypes of the PCM are fabricated and measured. Excellent agreement between simulations and measurements is achieved.