(英) |
Currently, the use of microwave and millimeter wave bands is being considered for outdoor applications to cope with the increase in communication traffic caused by the diversification of wireless communications such as IoT. In these frequency bands, the propagation loss factor is about three to four powers when the transmission and reception propagation paths are out of sight. In these frequency bands, the propagation loss factor is about three to four powers when the transmission and reception paths are out of sight. Therefore, it is necessary to take measures to reduce the propagation loss. In LoS-MIMO, the K-factor, which is the ratio of the received power to the power of the standing wave to the irregular wave, is known to affect the performance of the transmission. Therefore, we measured the received power using a drone in the 5/26 GHz band. This study clarifies how the K-factor changes when the antenna height is changed. From the experimental propagation loss, the relationship between the antenna height and the K-factor is shown in a simple equation. |