Abstract: In this paper, a three-layer metasurface structure for cross-polarization conversion is designed. The structure operates in the microwave frequency band, achieving a polarization conversion rate exceeding 95% within the frequency range of 9.53 GHz to 22.38 GHz, with a bandwidth of up to 12.85 GHz. It also maintains a polarization conversion rate of more than 80% within the incidence angle of 0° to 30°, showing high incident angle insensitivity. To further meet the requirements of radar stealth, a 6×6 checkerboard array composed of the proposed metasurface unit and its rotating unit with a phase difference of 180° is proposed. The radar scattering cross-section of the array is reduced by less than 10 dB in the 8.15 GHz to 24.00 GHz frequency band, and the relative bandwidth is extended to 98%. Simulation results indicate that the proposed design method has both wide frequency band, high efficiency, and low cost, providing a solution for communication enhancement and stealth technology from the perspectives of polarization conversion optimization and electromagnetic scattering regulation, respectively.