Non-wifi technologies using this band (microwaves, Bluetooth, etc.) or the neighboring WiFi access points using overlapping side channels create interference.
Best channels for 5 GHz Wi-Fi
Within the 5 GHz band, the channels 36, 40, 44, and 48 are all designated for domestic use, so we'd recommend sticking to one of those four channels to limit the possibility of interference from other, non-domestic applications (like military or aviation activity).
Having a higher channel means you will have better communication and wider bandwidth, but there is a chance of overlapping with other channels as well. For your information, 5GHz has 25 channels unlike 3 channels in 2.4GHz. 2.4GHz offers coverage for farther distances, but may perform at slower speeds.
Just about any electronic device that operates around the 5GHz range can interfere with a 5GHz WiFi connection. Microwaves, wireless phones, amateur radio transmissions are only a few of the many things can cause RF noise that can interfere with a router.
For example, the primary benefit of using the 2.4 GHz band is that it has better range. So, if you tend to use devices that require better range, turning off 5 GHz Wi-Fi may deliver better overall experiences by eliminating the possibility of automatically connecting to it.
Modifying or disabling the 5 GHz configuration, will not help with interference, within the 2.4 GHz frequency range. If you have 2.4 GHz performance problems, only changing the 2.4 GHz channel configuration, or reducing the interference that exists within that frequency range will help with that issue.
However, the frequency band with the longest reaching signals (2.4 GHz) is also the band with the most interference / wireless "noise". Extending your signal further will therefore contribute to even more interference for your neighbors.
Wi-Fi signals operate over radio waves, which are highly sensitive to interference from metallic objects. A strategically placed metal barrier -- such as one made out of tin foil -- will completely reflect all the Wi-Fi signals it encounters in the opposite direction.
On the 2.4 GHz band, which is usually Wireless-N, always choose Channels 1, 11, or 6. Try to pick the emptiest of the three, using the Wi-Fi Analyzer as your guide. Channels other than 1, 11, or 6 will receive more interference.
In general, 36, 40, 44, and 48 are the best 5G channels WiFi because they are least likely to overlap with other channels. However, if these channels are already congested in your area, you can try using channels 149, 153, 157, and 161 as they are also less likely to overlap with other channels.
Disadvantages - Shorter Range, Cost, Old Component Replacement. There are some disadvantages to going to a 5GHz wireless network. One is that the higher the frequency of a wireless signal, the shorter its range. For example, 2.4 GHz networks cover a substantially larger range than 5 GHz wireless networks.
The 5 GHz Wi-Fi frequency band is also much less prone to interference because it has more channels and because the 5 GHz frequency band is relatively isolated compared to 2.4 GHz—meaning other devices like garage door openers and cordless phones don't use it.
Interference: 5GHz WiFi signals have a shorter range than 2.4GHz signals and can be more easily disrupted by walls, furniture, and other objects. It's possible that something in your environment is causing interference and blocking the 5GHz signal.
By splitting your devices between 2.4GHz and 5GHz, you can maximize your network's performance.
Simultaneous dual-band routers are capable of receiving and transmitting on both 2.4 GHz and 5 GHz frequencies at the same time.
5GHz WiFi can pass through walls. That being said, 5GHz networks are more susceptible to interference from physical objects and may not be the best solution in a large home or office with many walls, floors, and other obstacles.
One of the simplest and easiest ways to stop Bluetooth Interference with Wi-Fi is to use the 5 GHz Frequency Band for all your Wi-Fi needs. We know that apart from 2.4 GHz Frequency, most modern routers and Wi-Fi devices use the 5 GHz Frequency for Wi-Fi communication.
if its 5GHz, use 80MHz, as long as you dont have a neighbour on one of your channel. Lets say you are on channel 36. As long as none of your neighbors are on 40, 44, 48, go ahead and use 80MHz.
5 GHz. The 802.11 standard defines 23 20MHz wide channels in the 5 GHz spectrum. Each channel is spaced 20MHz apart and separated into three Unlicensed National Information Infrastructure (UNII) bands. Wireless devices specified as 802.11a/n/ac are capable of operating within these bands.
If your neighbors have a Wi-Fi router on the same channel within range of your router or Wi-Fi gateway, it can cause interference. If there are nearby routers using the same Wi-Fi channel, you can avoid interference by changing your Wi-Fi channel.
Ideally, you'll want to run your 2.4GHz wifi network on channels 1, 6, or 11. You should be able to set your wireless network to a new channel within your router's settings. (And don't forget to do this same analysis for your 5GHz wireless networks as well.)