Wi-Fi信号强弱与这一点核心因素有关 别搞错了
买无线路由器就买天线又大又多的?相信这样的想法存在很多朋友的脑海中。
打开电商网站的无线路由器销售页面，我们可以发现，3根和3根以上天线的无线路由器，基本占领了热销产品的前几名。
这也反映出现在消费者选购无线路由器时的心理，“天线越多的肯定信号越好”。解决家中无线信号的问题，很难单纯地通过使用多天线的无线路由器解决，影响无线信号强度的因素是多方面的。
无线路由器存在多根天线的意义，其实是因为MIMO技术。无论是2根天线的产品，还是3根天线的产品，都是为了匹配X*X MIMO模式。
如目前主流的单频段300M和867Mbps无线路由器，其模式一定是2x2 MIMO，就是说两根天线就足够了。
如果在2x2 MIMO的产品中出现3根或3根以上的天线，那么就是厂商对消费者的误导。而且随着双频无线路由器的普及，有些厂商为每个频段都做了独立的外置天线，出现一些4天线、6天线的无线路由器也不足为奇。
重要的是，无线路由器信号好坏的决定性因素是无线路由器的发射功率。各国对无线路由器的发射功率都有规定，一般不得超过100mW，也就是20dBm（2.4GHz频段）。
所以我们可以看到，其实按照国家标准，发射端的信号强度是固定的。无论是几根天线，它的发射功率都不会变，也就不会影响到无线信号的覆盖。
除了无线路由器外，我们还应该从接收端上找原因，如果接收端的无线网卡灵敏度不高，那么无线上网的体验就会很差。
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