Abstract
Future radio industries such as the commercialization of 5G mobile communication services will gradually increase in frequency, starting from millimeter waves. Accordingly, beamforming technologies must be developed to efficiently utilize public radio frequencies. Beamforming technology is classified into three types: fully digital, hybrid digital, and analog. In this study, we designed and implemented analog beamforming systems. A system of three-dimensional beam tilting was implemented. The Rotman lens was stacked, and a 3 × 10 Vivaldi array antenna was constructed. A switch controlled by wireless connection was configured for beam selection; therefore, the system could be accessed and operated remotely. Three-dimensional radiation patterns of nine beams were measured using a multi-probe near-field measurement system. The experimental results were similar to the simulation results. Notably, the beamforming system implemented in this study could contribute to various communication services.
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