Fourth-generation (4G) cellular networks rely on many key components to provide the bandwidth and coverage that wireless service providers and their customers expect. One of these components is a phased-array antenna system with beam-steering capabilities that supports communications between relay stations and base stations. The proposed antenna design operates at 3.42 GHz and features 21.17 dBi gain and 424 MHz bandwidth, employing a least-mean-square (LMS) algorithm to provide a steerable mainlobe response with desired nulls and sidelobe suppression.