Reconfigurable RCS Reduction based on Broadband Metasurface Absorber

Abstract

In this paper, we proposed a broadband metasurface absorber based for reconfigurable RCS reduction. The proposed structure consists of a switchable screen on the top layer, a substrate layer, and a metal ground. PIN diodes are employed in the switchable layer to provide a variable resistor, in which the resistance of the variable resistor is controlled by the bias voltage. Unlike the traditional passive absorber, the designed metasurface has adjustable absorptivity. By manipulating the voltage applied to the PIN diodes, the metasurface absorber can execute various stages of reconfigurable reflectivity response. Simulation results demonstrate that the reflection coefficient of the absorber can be controlled from -8.4 dB to -1 dB over a wide frequency range of 8.9-18.8 GHz, and the thickness of the metasurface is only 1.6 mm. Furthermore, the proposed structure enables dynamic adjustment of the radar cross section (RCS) within this frequency band. The results show that the RCS of this metasurface has a dynamic adjustment range of at least 5 dB.