https://blog.wongcw.com/2020/04/02/fcc%e5%b0%87%e6%8a%95%e7%a5%a8%e9%96%8b%e6%94%bewi-fi-6e%e8%a8%ad%e5%82%99%e6%89%80%e9%9c%80%e7%9a%846ghz%e7%99%bd%e7%89%8c%e9%a0%bb%e6%ae%b5/