The application of fractal geometry in the antenna can greatly improve the performance of the antenna, and make it continue to be small, to meet the growing communication needs of the people. From birth of fractal geometry to the present application in various fields of science, because of its complex image with high self-similarity, when applied to antenna design, it can be well integrated with the electromagnetic theory, so as to solve the disadvantages and shortcomings of traditional antenna design. The combined fractal antenna based on fractal geometry design can further realize the miniaturization and gain of the antenna. Though the analysis of the relevant theoretical basis of the antenna, the model of the ring oscillator combined fractal antenna was constructed. In order to verify the performance of the combined fractal antenna structure, through the comparative analysis of physical measurement and simulation data, we can see that all the direction map, gain and bandwidth of combined fractal antenna have good effects, to better achieve the miniaturization of the antenna. Therefore, the combined fractal antenna can be used in practice, and it can be used for reference for the design of similar antennas