【Wireless】What is the relationship between channel selection and bandwidth?

What is the relationship between channel selection and bandwidth?

The bandwidth of each 5G channel is 40 MHz, but each channel only has 20 MHz main frequency can be used, so in choosing a 40MHz bandwidth will take up 2 channel. As shown in Figure 1.

Assumption：

1. When AP select 40MHz bandwidth, select the channel 48 as shown in the above, the frequency of the channel takes up 44 to 48 (that is, choose 44 and 48 is same).

2. When AP select 80MHz bandwidth, select the channel 64 as shown in the above, the channel will take up the frequency of the 52 to 64 (that is, the choice of 52, 56, 60, 64 is same).

So in the channel 149 to 165, only one noninterference channel of 80MHz can be used.