In view of the practical needs of low outofband scattering of antenna, through adjusting the response thickness of polarized conversion metasurface by combining the frequency selective surface, a metasurface is designed to utilize both efficient crosspolarized reflection and copolarized wave transmission window. Furthermore, this paper utilizes the geometric phase in response only to crosspolarized waves, through the checkerboard array configuration, for realizing the low scattering characteristics on both sides of the translucent window, in which the penetration loss of 10.0~11.0 GHz insertion loss is less than 1 dB and up to 0.8 dB. Besides, and the Low scattering characteristics are achieved in the 4.5~7.5 GHz and 12.0~17.0 GHz bands with RCS reduction of nearly 10 dB. The simulation and experimental results show that the proposed metasurface design method and architecture are characterized by the broadband RCS reduction and low penetration loss, and have potential application value in stealth radome.