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生活中我们有过这样的体验,正在正常通话的手机和人一起进入电梯时,通话会突然变得极不稳定;在有些钢筋混凝土的楼房里通话效果也不好,这是什么原因造成的呢?原来,手机通信的载体是电磁波,而电磁波会被铁罩或者密集的钢筋网格屏蔽。我们知道,光波属于电磁波中的可见光部分,当光从一种介质斜射入另一种介质时,光线的传播方向会发生改变,这就是光的折射现象。所有的电磁波都具有这样的特点。如下图所示,当磁感线从空气进入铁等磁性
In life, we had such an experience. When a normal mobile phone is entering the elevator together with a normal call, the call suddenly becomes extremely unstable. In some reinforced concrete buildings, the call effect is not good, what is the reason? It turned out that the carrier of mobile communications is electromagnetic waves, and electromagnetic waves will be shielded iron or dense steel grid. We know that light waves are part of the visible light in electromagnetic waves. When light is launched obliquely from one medium into another, the propagation direction of light changes. This is the refraction of light. All electromagnetic waves have such characteristics. As shown below, when the magnetic induction line from the air into the iron and other magnetic