By using the finite element analysis(FEA) software Patran/ Nastran, the model of composite paraboli-
c antenna was built and the structure properties were also simulated. The effects of reflector laying-up, and stiffening
rib structure and laying-up on the antenna fundamental frequency were further analyzed. The analysis results show that
the fundamental frequency of the antenna reflector using the [0/45/ -45/90] s laying-up is the highest. Fixing the cir-
cumferential and radial ribs on the reflector can obviously improve the fundamental frequency. By using the [0/30/
90/ -30] s laying-up in the stiffening ribs, the antenna fundamental frequency is further increased. The optimal struc-
ture of composite parabolic antenna with stiffening ribs is determined by FEA, which can provide the guidance for the
preparation of this composite parabolic antenna.