Experimental Evaluation of 28 GHz Multi-sector Base Station Antenna Consist of Yagi-Uda Antennas Assuming Indoor Office Environment

In the beyond 5G and 6G mobile communication systems more higher-frequency bands will be used such as millimeter wave and terahertz wave bands. Since propagation loss increases in the higher frequency bands, an efficient way to cover indoor areas with a limited number of base stations is to place base stations on the ceiling and to switch the branch of high-gain multi-sector antennas to actualize an omni-directional coverage area. Although there are some proposals regarding multi-sector antennas with beam switching, there is still insufficient measurement evaluation considering multi-sector antennas in indoor environments. In this paper, we present an experimental evaluation assuming an indoor office environment using a 28-GHz band multi-sector base station antenna consisting of Yagi-Uda antennas in a shielded room.