920MHz band propagation characteristics near metal ceiling for secure IoT communication

抄録

In this paper, we investigate the path loss characteristics near metal ceiling in 920 MHz band for secure wireless communication of indoor-use equipment such as lighting systems. In order to clarify the propagation mechanism, experiment and electromagnetic simulation are conducted using two models as use cases: a simple model with only a metal ceiling and an office with a metal ceiling. The results show that the path loss characteristics for vertical polarization near the metal ceiling has a smaller than the free space loss. The path loss characteristic for horizontal polarization, however, changes significantly depending on the floor condition.