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

This letter proposes a metasurface capable of achieving a –20 dB 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 nonplanar metal ground units and the reduction bandwidth. Second, a circuit analog absorber (CAA) structure is designed to achieve broadband absorption functionality. In addition, the RCSR performance of the nonplanar metal ground with randomly arranged units is analyzed. Finally, by replacing the ground of the CAA with a nonplanar 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 –20 dB from 3.4 GHz to 14.4 GHz.