Book excerpt: The Frequency Diverse Array (FDA) antenna provides range - angle - time dependentbeampattern, potentially generating highly directional beams with high gain that may besteered directly and continuously to the desired position. This research explores using FDAantenna for tracking a Low Earth Orbit (LEO) satellite. Although FDA array antenna hasbeen growing in use for radar communication systems with advantages of it is electronicallybeam steering, it is still not truly used in integrate with LEO systems. The mathematicalmodel of FDA antennas with dierent geometries for tracking LEO satellite is presented.Then, the radiation characteristics of linear and Planar-FDA under dierent situations areinvestigated. Further, the planar FDA array owns greater superiority over the linear FDAarray, and it can cover the observation space indicating great potential in LEO trackingand communication applications. A ground receiving antenna system based on planar FDAarray antenna is presented for tracking and communicating with (LEO) satellite at groundstation. This is required to minimize a complexity and the cost of ground station. Tomeet the system gure of merit (G/T) requirement, the radiation characteristics, the gainrequirements, the array size, the minimum number of elements and their distribution forseveral FDA array antenna architectures are calculated and analyzed. Moreover, a generaloverview of system temperature is presented including a noise model for FDA array antenna,and the link budget analysis and evaluation are introduced.