https://blog.wongcw.com/2020/07/13/%e7%82%ba%e6%98%9f%e9%8f%88%e9%a0%85%e7%9b%ae%e9%8b%aa%e8%b7%af%ef%bc%9aspacex%e6%ad%a3%e7%a9%8d%e6%a5%b5%e9%81%8a%e8%aa%aafcc%e9%96%8b%e6%94%be12ghz%e9%a0%bb%e8%ad%9c%e4%b8%ad%e7%9a%84500mhz/