GHz and Network Range
The higher the frequency of a wireless signal, the shorter its range. 2.4 GHz wireless networks therefore cover a substantially larger range than 5 GHz networks. In particular, signals of 5 GHz frequencies do not penetrate solid objects nearly as well as do 2.4 GHz signals, limiting their reach inside homes.
GHz and Network Interference
You may notice that some cordless phones, automatic garage door openers, and other home appliances also use 2.4 GHz signaling. Because this frequency range is commonly used in consumer products, it’s become saturated with signals. This makes it more likely that a 2.4 GHz home network will suffer interference from appliances than will a 5 GHz home network. This can slow down and interrupt WiFi network speed in these cases.
All these interferences do not affect the 5 GHz being very far from that band, which also has the advantage of being able to send data through several channels at the same time. Thanks to all this, a 5 GHz signal is more stable and reliable, but in general, it has a shorter range. Therefore, using the 2.4 GHz Wifi has only one advantage: that it reaches a greater distance if the router is several tens of meters away from our device, or if there are walls in between.
With this, we have the 2.4 GHz WiFi from the 2.412 MHz bands (channel 1) to the 2.472 MHz (channel 13), where there is a new channel in every 5 Mhz. Each channel covers up to 22 MHz, where they overlap each other, hence, in the case of the 5 GHz WiFi, there are 21 channels of 20 Mhz each, wherein that space none overlap each other.
The actual maximum speed reached by the 2.4 GHz coverage is about 150 Mbps (theoretical 300 Mbps), while at 5 GHz it reaches speeds that vary between 200 Mbps and 1 Gbps, with theoretical maximums of 433 Mbps and 1 or 7 Gbps.
However, the fact is that the most modern routers can now join both networks into one, in such a way that it automatically decides which network is the most convenient to use at any time, automatically changing our device between them. This is possible simply due to the features like Intelligent WiFi, present in routers such as the premium WiFi Repeater.
Even if they do not have Intelligent WiFi, almost all current routers create two networks, and the mobile automatically connects to the 2.4 GHz one if we are connected to the 5 GHz and we are left without coverage.
You can also give the same name and password to both networks, although this may not work with all devices. You should bear in mind that some of your old devices may only work with 2.4 GHz Wi-Fi, as on the smartphones more than 5 years ago.
GHz and Cost
Some people mistakenly believe 5 GHz network technology is newer or somehow more innovative than 2.4 GHz because 5 GHz home routers generally became available after those that use 2.4 GHz radios. In fact, both types of signaling have existed for many years and are both proven technologies.
Routers that offer both 2.4GHz and 5GHz radios are generally more expensive than those offering only 2.4GHz radios.