A new common aperture antenna design is presented. Using the characteristics of different antennas with different radiation spaces, the low-frequency antenna’s weak radiation area is loaded with the high-frequency area, and the idea of complementing the two antenna radiation areas realizes a common aperture. Simulation results show stable integration of the far-field radiation characteristics of the antenna, the isolation is more than 82 dB reached. It has a strong significance to reduce the number of airborne antenna platform, improve the integration system.