Frequency Bands and Channels

Wi-Fi mainly operates on two radio frequency bands: 2.4 GHz and 5 GHz (with newer gear adding 6 GHz). Each band is divided into channels, smaller slices of frequency that networks use to avoid talking over each other. Understanding bands and channels is key to designing fast, interference-free wireless. This lesson explains both and how to pick channels wisely.

The 2.4 GHz band offers longer range and better penetration through walls, making it good for coverage. But it is slower and crowded: many devices use it, including older Wi-Fi, Bluetooth, microwaves, and cordless phones. This crowding causes interference. The 2.4 GHz band has only a handful of usable channels, which makes interference even harder to avoid.