A Reflective Electromagnetic Metasurface Based on Phase Gradient Principle and RCS Reduction Application
For electromagnetic beamforming and electromagnetic stealth issues,a reflective phase gradient metasurface in the form of cross slits on a circular patch is designed,and the differential reflective phase coverage is achieved by adjusting the cell size.Metasurface acts in the X-band and arranges the metasurface units in a linear,equal-phase difference format to deflect the maximum scattering direction of the reflected wave out of the angular field of interest.By adjusting the value of the phase gradient,the maximum scattering direction can be precisely controlled to reduce monostatic backscattering while taking into account the reduction of bistatic scattering in the angle of interest domain.The unit structure is symmetrically designed with polarization-insensitive characteristics.Based on this phase gradient metasurface,the 1D and 2D phase gradient metasurface arrays are designed.The peak RCS of the 1D array structure is reduced by 41.13dB,the mean value is reduced by 8.7dB,and the maximum scattering direction is deflected by 16.5°;the peak RCS of the 2D array structure is reduced by 16.29dB,the mean value is reduced by 9.04dB,and the maximum scattering direction is phi=135°,theta=23°.1D and 2D arrangement forms achieve monostatic and bistatic radar stealth effect.
left-hand materialmetasurfacephase gradient metasurfaceRCSSnell's law
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