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The paper proposes a four-directional beamforming switched antenna system based on Butler matrix for 28 GHz mmWave. It is made up of a 90-degree coupler, a crossover, and a 45-degree phase shifter. A 4&#x00D7;4 Butler matrix is combined with a 28 GHz patch antenna to form a Butler network antenna. Four directions of the radiation beam can be changed when the input position is changed. From the simulation and measurement results, the measured reflection coefficients cover 27.9-29.3 GHz at all four ports with a standard reflection coefficient of -10 dB and four different angles of 15&#x00B0;, -46&#x00B0;, +44&#x00B0; and -13&#x00B0; for switching beam direction. The antenna&#x2019;s compact size of 39.1 &#x00D7; 45.6 mm&#x00B2; (3.65&#x03BB; 0  &#x00D7;4.26&#x03BB; 0 ) makes it ideal for use in millimeter wave bands for 5G NR n258, and n261 applications, while also providing a high gain of 11.5 dBi.

A Low-Cost Four-Directional Beamforming Switched Butler Matrix Network Antenna for 5G NR Applications