Electric field calculation for 5G base station with adaptive antenna system

This paper presents the procedure for calculating the electric field level in the vicinity of base stations (BS) implemented in 5G technology. The specificity of the 5G system is the application of dynamic routing of traffic radiation beams directly towards active users (beamforming). In the paper, the following characteristics are calculated: 1. maximum field level; 2. mean field level without application of power control and 3. mean field level with application of radiated power control in the BS for traffic channels depending on the distance from the BS, taking into account only the field created by the considered BS, not the neighbouring ones. In this calculation, a uniform distribution of user density in the BS cell and an equal traffic load of all users during a sufficiently long-time interval were assumed. The parameters that change in the graphs are the characteristics of the applied antenna (width of its main radiation beam, gain in the main and side radiation beams), BS height and radius of the BS cell. The most interesting result is that the mean level of radiation in the case of application of control of the emitted power can also increase with increasing distance from the BS, whereby the shape of the obtained characteristics depends on the radius of the BS cell. However, in an absolute sense, the level of the electric field in this case is lower than the values allowed by regulations and can pose a danger only through the aggregate value with other sources of radiation.