为什么地铁上手机信号很差？

in cn •  11 months ago 

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不知道大家有没有发现，在地铁上打电话时候，手机信号很差，这是为什么呢？

在地铁封闭的环境中，电磁信号经常会受到干扰和衰减，加之地下区域运行，各种金属物质对信号易产生阻断作用，使得进入车厢后信号范围异常缩小且带宽非常窄，同时地铁里人员较为密集，越是人流量大的位置，信号强度越会变得更低。

cn zzan dblog
11 months ago by

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      ·  11 months ago 

    现在有一种随身WIFI，不知道有没有用？

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