Broadband RCS reduction antenna based on polarization rotation metasurface

The invention relates to the technical field of antennas, in particular to a broadband RCS (radar cross section) reduction antenna based on a polarized rotating metasurface, which is characterized in that a patch of the polarized rotating metasurface is arranged to be shaped like a Chinese character'tu ', and a dielectric substrate is combined to select a proper surface unit shape and size, so that the polarization conversion efficiency under a broadband reaches more than 80%; meanwhile, according to the theoretical basis of the polarization rotating metasurface, the multiple broadband RCS reduction units are arranged in a checkerboard arrangement mode, the RCS reduction effect of 5 dB or above within the frequency band of 12-20 GHz is achieved, it is guaranteed that incident electromagnetic waves are scattered in all directions, and finally the antenna design is completed in cooperation with the radiation patch units; the antenna capable of realizing broadband RCS reduction under the condition that the radia