Wideband Low-RCS Linear Polarized Array Based on Miniaturized Polarization Conversion Metasurface

Based on the proposed miniaturized polarization conversion metasurface (PCM), a checkerboard metasurface is designed, which can realize radar cross Section (RCS) reduction in the ultrawide range of 4.3-13.5 GHz (103%) by using the principle of reflection phase cancellation. The characteristic mode analysis (CMA) method is introduced to establish the checkerboard PCM as the radiation patch, and a wideband low-profile antenna for the C-band is achieved, with a bandwidth of 4.8-6 GHz (22.2%). The highlight and advantages are that the size of the checkerboard PCM is significantly reduced, and its side length is close to the radiation wavelength of the antenna. The antenna element based on this checkerboard PCM has the characteristics of small size and wide frequency range of RCS reduction, and the low-RCS antenna array can be realized by paving them seamlessly. Moreover, the checkerboard PCM not only suppresses scattering but also improves antenna performance and plays an important role in achieving wideband and enhancing radiation directivity.