High efficient and ultra-wideband polarization converter based on I-shaped metasurface for RCS reduction

Abstract

In modern communication systems, polarization has always been a major issue. Traditional polarization converters have limited uses because of their enormous size and narrow bandwidth. In this paper, an ultra-wideband and high efficient polarization converting metasurface (PCMS) is designed for radar cross section (RCS) reduction. The designed PCMS consists of I-shape unit cell manifesting linearly polarized (LP) incident wave to its orthogonal equivalent. In a frequency range of 10.5 GHz to 29.5 GHz, the design PCM achieves a polarization conversion ratio (PCR) more than 90% with 95% fractional bandwidth (FBW). The designed PCMS is used in a triangular chessboard configuration to reduce the RCS. To obtain destructive interference, the proposed array consists of two-unit cells, PCMS and its mirror, with a phase difference of 180 ± 37°. To reduce RCS, the proposed PCMS unit cell is rotated at 90°, 180°, and 270° for phase cancellation. The proposed array reduced RCS in the ultra-wide frequency range of 8.2 GHz to 29.4 GHz with 113% FBW. The proposed PCMS is validated experimentally. Simulation and experimental results are found in good agreement.