In this paper, received power levels in 420 M/920 M/2.4G/5.3 GHz bands for sensor networks and WLANs are obtained by ray‐trace analysis in an office environment and the detail properties of propagation paths are analyzed. As a result, 25% average power of the total power arrives through ceiling spaces in the rooms where electromagnetic waves are hard to arrive through the walls. This means that the power remains in −6 dB even though the propagation paths are blocked by several metallic furniture beside the walls. In this indoor environment, the propagation paths through ceiling spaces can be relatively good for wireless communication. The results confirm that modeling of structures in ceiling spaces is necessary to obtain practical received power levels.

中文翻译：

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室内环境中天花板空间无线电波的传播分析

本文通过办公室环境中的射线迹线分析获得了420 M / 920 M / 2.4G / 5.3 GHz传感器网络和WLAN的接收功率电平，并分析了传播路径的详细特性。结果，总功率的平均功率的25％通过房间的天花板空间到达，而电磁波很难穿过墙壁到达房间。这意味着即使传播路径被墙壁旁边的几把金属家具所阻挡，功率仍保持在-6 dB。在这种室内环境中，通过天花板空间的传播路径对于无线通信而言可能相对较好。结果证实，天花板空间中的结构建模对于获得实际的接收功率水平是必要的。