Design and Implementation of a Novel 4x4 Butler Matrix For a 5G Base Station Application

The paper suggests a four-switching beam directional antenna array system based on a novel butler matrix for 5G base station application at 28 GHz.A comprises a 90 o hybrid coupler, a single crossover, and a 45 o phase shifter.A four-input, four-output Butler matrix is integrated with a 28 GHz patch antenna to create a Butler network antenna.The excited input port can change the four output directions of the radiation array beam.Based on the simulation and measurement outcomes, the four beams' reflection coefficients cover 24.9-32 GHz with -10 dB and 137o coverage angles.The beamforming switched beam array has a compact size of 4 x 2.89, making it an appropriate candidate for use in a five-generation base station.