The question of how many GHz 5G WiFi uses for data transmission often causes confusion even among experienced users, as it confuses terminology from mobile communications and home wireless networks. Many mistakenly believe that the "fifth generation" (5G) in mobile phones and the 5G WiFi standard (which is actually WiFi 5 or WiFi 6) are the same thing, but their underlying physics are different.
In the context of home routers, the abbreviation 5G most often refers to operation in the range 5 GHz, although modern standards allow for the use of both 2.4 GHz and even 6 GHz simultaneously. Understanding this difference is critical for properly configuring equipment and achieving maximum internet speed in an apartment or office.
Below, we'll take a detailed look at the specific frequencies involved, why the numbers in the standard's name don't always match the actual signal frequency, and how to choose the optimal operating mode for your device.
Understanding the Terminology: 5G vs. 5 GHz
The first thing to clearly understand is the difference between mobile technologies and wireless local area network standards. When you see the 5G icon on your smartphone screen, you're talking about the fifth generation of cellular communications, which can operate at frequencies from 600 MHz to 39 GHz and higher.
In the WiFi world, the “5G” label on a router box or in the network name (SSID) has historically been an abbreviation for 5 GHzThis refers to the IEEE 802.11ac (WiFi 5) standard, which was the first to widely introduce 5 GHz wireless performance to consumer devices.
However, a modern router with 5G support (meaning WiFi 5 or WiFi 6) is not limited to one frequency. It is dual-band or even a tri-band device that can transmit a signal simultaneously on different waves to ensure compatibility with older gadgets.
⚠️ Attention: Don't confuse 5 GHz support in your router with your mobile operator's 5G plan. To use 5 GHz Wi-Fi, you don't need a 5G-enabled SIM card; a compatible router and receiving device are sufficient.
It's important to distinguish between these concepts to properly diagnose speed issues. If your provider offers a 100 Mbps connection, but you're connected to a 2.4 GHz network in an apartment building, your actual speed may drop to 20-30 Mbps due to interference, regardless of whether your phone supports 5G.
Main frequency ranges of WiFi networks
Modern wireless communication standards rely on three main frequency "pillars." Each has its own unique physical properties, which influence the wall penetration range and maximum data transfer speed.
Range 2.4 GHz is the oldest and most widespread. Its main advantage is excellent penetration. A signal at this frequency bends around obstacles better and passes through thick concrete walls, but its channel capacity is extremely low.
In contrast, the range 5 GHz (the basis of the 802.11ac standard) offers much wider channels and is less susceptible to interference from household appliances like microwaves or Bluetooth devices. However, the physics of high-frequency waves means they have difficulty passing through solid objects.
The newest player on the field is Range 6 GHz, which emerged with the introduction of WiFi 6E and WiFi 7. This is a "clean" frequency with virtually no neighbors, allowing for maximum performance from equipment, but its range is even shorter than that of 5 GHz.
Comparison table of range characteristics
To systematize the information and understand what the operating mode is (band) to choose for specific tasks, let's look at comparative characteristics. Speed figures are approximate and depend on the channel bandwidth and class of your router.
| Parameter | 2.4 GHz | 5 GHz | 6 GHz |
|---|---|---|---|
| Maximum speed | up to 150-600 Mbit/s | up to 1300-4800 Mbps | up to 9600+ Mbps |
| Penetration ability | High | Average | Low |
| Interference level | Very tall | Average | Minimum |
| Ideal for | Smart home, IoT | Streaming, gaming | VR/AR, 8K video |
The table shows that for tasks requiring high throughput, the 5 GHz band and above is the undisputed choice. However, for smart home devices that transmit minimal data, high frequencies may be excessive and even problematic due to poor coverage in remote areas.
It is worth noting that many modern routers use technology Band Steering (smart switching). In this case, the router itself decides which frequency to use to serve the client, combining networks under a single name.
Technical features of the 5G standard (802.11ac/ax)
When we talk about "5G WiFi," we most often mean the standard IEEE 802.11ac, which is now called WiFi 5, or its successor 802.11ax (WiFi 6). These standards were developed specifically to relieve congestion in the 2.4 GHz band.
A key feature of 5 GHz operation is the ability to use wider channels. While the maximum channel width in the 2.4 GHz band is 20 or 40 MHz, in 5 GHz it can reach 80, 160, and even 320 MHz in the WiFi 7 standard.
Channel width directly impacts speed, but it also increases the demands on signal quality. The wider the "pipe" through which data travels, the more likely it is to become clogged with noise or to be interrupted when moving away from the router.
What is MU-MIMO and how does it relate to frequency?
MU-MIMO (Multi-User Multiple-Input Multiple-Output) is a technology that allows a router to simultaneously transmit data to multiple devices. It is most effective in the 5 GHz band and above, where there is sufficient spectrum bandwidth to separate streams without sacrificing speed for each client.
Modulation is also important to mention. At 5 GHz and 6 GHz, more complex signal encoding schemes (such as 1024-QAM or 4096-QAM) are used, allowing more bits of information to be packed into a single wave. However, this only works with very good signal strength (RSSI).
Coverage issues and high frequency interference
The main drawback of switching to 5 GHz (and especially 6 GHz) is the physics of radio wave propagation. High frequencies mean short wavelengths, which are easily reflected from surfaces and absorbed by materials.
Water is one of the main enemies of the 5 GHz signal. This includes not only aquariums, but also plants and even the bodies of people in the room. In a crowded conference room, 5 GHz WiFi speeds can drop simply due to the density of people present.
Drywall walls hold a 5 GHz signal well, but concrete with rebar, mirrored surfaces, and metal structures can completely block communication. Unlike 2.4 GHz, which "bleeds" through obstacles, 5 GHz requires a clear line of sight or minimal obstructions.
⚠️ Attention: If after switching to a 5G network (5 GHz), the speed drops to zero in the far room, it's not a router problem. It's a physical range limitation. Switch back to 2.4 GHz or install a repeater/mesh system.
To solve coverage issues in large apartments, we recommend using mesh systems. They create a unified network where multiple nodes broadcast the signal, allowing devices to switch between frequencies and access points without losing connection.
How to choose the right range for your needs
The choice between 2.4 GHz and 5 GHz (or 6 GHz) should depend on the type of apps used and the device's location relative to the router. There's no universal "set it all and forget it" solution, although automatic switching works well.
For online gaming, watching 4K video, video calls and downloading large files, the range should definitely be a priority. 5 GHz or 6 GHzHere you'll get minimal ping and no image stuttering.
For smart plugs, light bulbs, vacuum cleaners, and other IoT devices that are often located far from the router and transmit little data, it's best to use the 2.4 GHz band. These devices often don't operate at higher frequencies at all.
☑️ 5 GHz Readiness Check
If you live in an apartment building where the airwaves are cluttered with dozens of neighboring networks, switching to 5 GHz will be a breath of fresh air. This band has more non-overlapping channels, allowing you to find a clear frequency to operate on.
Router setup: manual channel and bandwidth selection
For maximum performance, 5G WiFi (5 GHz) networks often require manual configuration. Routers' automatic algorithms don't always select the optimal channel, especially in dense urban areas.
Log into your router's interface (usually at 192.168.0.1 or 192.168.1.1) and find the wireless network settings section (Wireless Settings). Here you need to select the 5 GHz band.
Pay attention to the parameter Channel Width (Channel Width). For maximum speed, set it to 80 MHz or 160 MHz. However, if speed is unstable, try reducing the channel width to 40 or 20 MHz—this will improve connection stability in noisy environments.
Recommended static channels for 5 GHz (DFS channels may not be available):
36, 40, 44, 48 (Lower range, usually no DFS)
149, 153, 157, 161, 165 (High range, high power)
Using DFS (Dynamic Frequency Selection) channels allows the router to operate on frequencies reserved for radar. The router automatically "listens" to the airwaves and switches if it detects a radar. This provides more free channels, but can cause brief connection interruptions.
⚠️ Attention: Router interfaces vary from manufacturer to manufacturer (Keenetic, TP-Link, Asus, Mikrotik). If you're unsure of the setting, it's best to leave it at "Auto," but periodically check the channel load using dedicated WiFi analyzer apps on your smartphone.
Frequently Asked Questions (FAQ)
Why can't my phone see the network called "5G"?
Your device may be too old and only supports the 2.4 GHz band (standards up to 802.11n). Also, check whether the network name is hidden (SSID Hide) in the router settings or whether a MAC address filter is enabled.
Does the name "5G" affect mobile internet speed?
No. The WiFi network name "5G" or "5GHz" refers only to the local wireless network inside the apartment. Internet speed depends on the provider's plan and connection technology (fiber optic, ADSL, 4G/5G modem), not on the WiFi router's frequency.
Is it possible to combine 2.4 and 5 GHz networks into one?
Yes, this feature is called Smart Connect or Band Steering. The router automatically directs the device to the appropriate frequency. However, for desktop PCs or consoles, it's sometimes better to manually separate the networks to ensure you're connected to the fast 5 GHz band.
Do you need a special cable for 5G WiFi speed?
To connect your router to your computer via cable (if you decide not to use WiFi), you'll need a Cat5e or Cat6 cable to achieve speeds above 100 Mbps. The WiFi signal itself doesn't require a cable, but the cable running from your ISP to your router must be high-quality.
Is 5 GHz radiation harmful to health?
No. WiFi frequencies (2.4, 5, and 6 GHz) are classified as non-ionizing radiation. Their energy is insufficient to damage DNA. The transmitting power of household routers is also strictly regulated by health standards and is hundreds of times lower than the maximum permissible levels.