luizthiago You're welcome my friend 🙂 I did some tests recently
In the first time, the Raspberry Pi 3 does not support the frequency 5 Ghz. Only 2.4 Ghz frequencies. On the other hand it supports the frequency 2.4 Ghz as well as the bandwidths 20 Mhz and 40 Mhz. But, I discovered that the wifi connection does not work when the bandwidth is 40 Mhz. It only works with 2.4 Ghz frequency and 20 Mhz bandwidth (for the moment)
We do not know if it's a system bug or if it's a hardware bug from Raspberry