Abstract: This paper mainly introduced a large size and high-performance radar radome for FY-4 satellite. The radome was a foam sandwich structure, using free E glass cloth, unsaturated polyester resin, polyurethane foam and surface coating system. The radome was prepared by hand lay-up molding and vacuum infusion process technology at room temperature to solidify. Structure calculation for the radome was analyzed in 67 m/s wind load, with a maximum deformation of 50 mm. Before the foam and skin forming, the surface treatment of foam was used to improve the interface bonding performance. The forming process was of high efficiency and good surface quality. The mechanical properties were excellent with the tensile strength of 0.35 MPa, the bending strength of 28.3 MPa, the shear strength of 320 kPa and the lateral pressure strength of 60.8 MPa. The electrical performance of the radome was good, and the dielectric loss in the L/S/C band was between 0.1 dB and 0.6 dB.

Key words: radome, foam sandwich structure, composite material, electric properties