关键词: 5G基站, 大规模MIMO天线, 波束赋形, 选频电磁场, 电磁辐射

Abstract: 5G base stations are the first of the new infrastructure. The construction of high-density station brings the electromagnetic radiation of the 5G base station into the focus of environmental monitoring and public attention. Taking Beijing 5G communication base station as an example, three selected typical 5G base stations were tested with the SRM-3006 frequency selective radiation analyzer according to the “Electromagnetic Radiation Monitoring Method for 5G Mobile Communication Base Station (Trial)” (HJ 1151—2020). Based on the characteristics of monitoring equipment and 5G applications, the test, with assistance of the terminal, simulates various working conditions by selecting different equipment parameters, application scenarios and test environments. The test result is lower than the electromagnetic environment control limit, which indicates that the electromagnetic radiation level of the 5G base station is generally controllable. By analyzing the test data, it is recommended that the monitoring instrument RBW be set to 300 kHz, the amplitude to 5 V/m, the noise suppression to 3 dB, the distance between the terminals and the probes to 1m, the scenario mode to data transmission mode (download 3 GB file), and deployment direction to the antenna major lobe. Thus, the monitoring results can be reproduced, the current status of the 5G base station electromagnetic radiation environment can be acquired, and at the same time it can be referred by the monitoring agency to accurately measure the electromagnetic radiation of the 5G base station.

Key words: 5G base station, massive MIMO, beam-forming, frequency selective electromagnetic field, electromagnetic radiation