Design of Antenna Array Based Metasurface for Wide-Angle Radar Cross Section Reduction

In this paper, an antenna array based metasurface has been designed for the radar cross section (RCS) reduction with good incident angle and polarization stability characteristics. The metasurface is composed of the dual-element subarrays. In each subarray, two ports of each antenna are connected by a Wilkinson power divider, and two antenna elements are connected by a microstrip line with a lump resistor. Two dual-polarized antenna elements can simultaneously receive the incoming waves in an approximately same way, and thus the received energy can be cancelled out and absorbed at the position of the lump resistor. In order to achieve the good RCS reduction with the wide incident angle stability, the dual-element subarray is arranged into a metasurface array in the mirror and rotation way. Numerical results are given to demonstrate that the proposed metasurface can achieve the -10 dB RCS reduction in the band of 9.1~9.75 GHz for a dual-polarized incoming wave with a wide incoming angle range of $\pm 60^{\circ}$.