Abstract: Using a carbon fiber triaxial woven fabric (TWF) as a reinforcing material and compounding it with a suitable flexible matrix material, a carbon fiber three-directional woven composite shell film structure is formed，featuring both flexibility and rigidity. As a satellite antenna reflector, it is a new type of high precision deployable antenna implementation.  The mechanical properties of silicone matrix TWF composites were studied. Using the composite mesoscopic method, the material properties of the homogeneous fiber bundle were obtained from the material properties of the fiber and the matrix. Then, considering the fiber bundle interlacing (undulation fluctuation), a unit cell finite element model composed of the fiber bundle was established. Homogenization analysis of the unit cell finite element model was carried out, applying periodic boundary conditions, and finally obtaining equivalent homogeneous material properties. In order to meet the high performance requirements of antenna reflectors, the influence of carbon fiber type and fiber volume content on the equivalent performance of unit cell was analyzed. The mechanical properties of the material were studied, which provides a theoretical basis for its application to large deployable highprecision antenna reflectors in the future.

Key words: high precision deployable antenna, silicon matrix TWF composite, mesoscopic modeling, periodic boundary conditions, parameter performance analysis