Ultralow RCS and Wideband Metasurface Using a Hybrid Absorption and Phase Cancellation Mechanism

This work proposes a metasurface capable of achieving a -20dB radar cross section reduction (RCSR) with a relative bandwidth of 123.6%. First, the RCSR performance achieved by introducing phase cancellation and absorption mechanisms within the same frequency band. The focus is on deriving the relationship between the number of non-planar metal ground units and the reduction bandwidth. Second, a circuit analog absorber (CAA) structure is designed to achieve broadband absorption functionality. Additionally, the RCSR performance of the non-planar metal ground with randomly arranged units is analyzed. Finally, by replacing the ground of the CAA with a non-planar metal ground, enhanced scattering performance is achieved. A metasurface prototype is fabricated, assembled, and measured for its reflection performance. The experimental results align well with the simulation results, showing a reduction of more than -20dB from 3.4 to 14.4GHz.