This study presents an innovative design for a four-port square sector power splitter, showcasing its practical applications. To enable precise signal manipulation of phase and amplitude across power divider branches, insertion and insertion fitting techniques are employed. Impedances are tailored to achieve the required power ratio through pairing techniques. The design process leverages electromagnetic solvers based on the Method of Moments (MOM). Key parameters for the power divider include a dielectric constant (Er) of 4.3, a loss tangent of 0.02, and a height of 1.6 mm. In addition to the antenna array, an ultra-wideband antenna is also designed. To further enhance its performance, optimization techniques such as the fly flight algorithm, cuckoo search algorithm, and spring cuckoo algorithm are applied. These strategies focus on minimizing mutual coupling and refining key antenna parameters, including return loss, gain pattern, directivity, and radiation.