科学素养与生活应用·英语30篇（2）

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Wi-Fi信号为何难以穿透墙壁和楼板

Wi-Fi operates on radio frequencies—typically 2.4 GHz or 5 GHz—that interact differently with solid materials.
Dense substances like concrete, brick, or metal reflect or absorb signal energy, weakening transmission.
Water-rich objects—including human bodies and aquariums—also scatter 2.4 GHz waves significantly.
Higher-frequency 5 GHz signals carry more data but penetrate walls less effectively than 2.4 GHz ones.
Router placement matters: central, elevated locations avoid obstructions and maximize coverage evenly.
Mesh networks solve this by using multiple nodes to relay signals around barriers instead of relying on one source.
Interference from microwaves, baby monitors, or neighboring Wi-Fi networks further disrupts stable connections.
Upgrading to Wi-Fi 6 improves efficiency in crowded environments but doesn’t eliminate physical signal loss.