Many users are familiar with the situation where the internet is lightning fast in one room, while in the next room, literally on the other side of the wall, videos load poorly or the connection constantly drops. This isn't magic or a random provider outage, but the physics of radio wave propagation, something every wireless network owner faces. Wi-Fi signal — is electromagnetic radiation that behaves predictably, but has its limitations, especially in modern apartments with dense layouts.
The main problem is that router They are often installed in the most convenient location for cable routing, such as in the entryway near the front door or in the far corner of the living room. As a result, the signal reaching distant rooms is weakened. Understanding how walls and distance affect connection quality, will help you choose the right strategy to improve the situation without purchasing expensive equipment.
In this article, we'll take a detailed look at why this happens, which wall materials are signal killers, and how to diagnose the problem yourself. You'll learn how to properly position antennas and whether it's necessary to change encryption standards or broadcast frequencies to ensure stable performance in every area of your home.
Signal Physics: How Walls and Distance Kill Speed
Radio waves used to transmit data have a specific frequency and wavelength, which directly affects their penetrating ability. Standard 2.4 GHz Waves are better at bending around obstacles and passing through walls, but they are more susceptible to interference from household appliances. At the same time, the range 5 GHz provides high speed, but it signal fades significantly faster when encountering physical obstacles.
Every centimeter of a wall absorbs some of the wave's energy. If there's a load-bearing wall made of reinforced concrete between the router and your device, it can absorb up to 90% of the signal's power. Wooden partitions or drywall are less critical, but they still have their effects, especially if there's wiring or foil insulation running inside.
⚠️ Caution: Using foil insulation or metallized wallpaper during renovations can turn your room into a "Faraday cage," completely blocking the passage of radio waves into the room.
Distance also plays a critical role. Signal strength decreases proportionally to the square of the distance from the source. This means that even without walls, the signal at a distance of 10 meters will be four times weaker than at 5 meters. In a real apartment, where the signal is also reflected by furniture, this attenuation is even more pronounced.
The influence of wall materials and layout on the coating
Not all walls have the same effect radio signalThe material they are made of determines the attenuation coefficient. For example, brickwork attenuates the signal less than monolithic reinforced concrete with metal reinforcement. Mirrors, aquariums filled with water, and even large book collections can pose a serious obstacle to stable reception. Wi-Fi connections.
The apartment's layout also matters. Long hallways create a tunnel effect where the signal can travel well, but side rooms remain in a "blind spot." If the router is located in an alcove or behind a closet, it's the equivalent of installing an additional barrier in the path of the waves. Open spaces are always preferable for radio wave propagation.
Let's consider the approximate influence of various materials on the signal level (the data is approximate and depends on the thickness and humidity of the material):
| Obstacle material | Attenuation coefficient (dB) | Impact on signal |
|---|---|---|
| Wood / Drywall | 2 - 5 dB | Minimal, the signal goes through well |
| Brick wall | 10 - 15 dB | Noticeable weakening, speed drops |
| Reinforced concrete (with reinforcement) | 20 - 30 dB | Critical, connection breaks possible |
| Mirror / Coated glass | 15 - 25 dB | Signal reflection, creation of dead zones |
It's important to note that older buildings with thick walls can be more challenging for wireless networks than modern new buildings with thin partitions, despite the presence of reinforcement in the latter. In any case, router positioning in relation to these obstacles is a key factor for success.
Hardware issues: router, antennas, and overheating
Often, poor reception is caused not by the walls, but by the signal source itself. Cheap router models may have weak transmitters that are physically incapable of penetrating even a single solid wall over long distances. Low-gain antennas (less than 5 dBi) distribute the signal evenly, but not very far.
Antenna configuration is also important. If your router has two antennas, they should be oriented perpendicular to each other (one vertical, one horizontal), as the antennas of client devices (smartphones, laptops) may also be oriented differently. Incorrect orientation leads to polarization losses signal.
The technical condition of the equipment shouldn't be ignored either. Overheating of the router's processor during prolonged operation leads to throttling (reduced performance) and unstable operation of the radio module. Dust trapped inside the casing acts as a heat insulator, impairing cooling.
⚠️ Caution: If the router housing becomes very hot and smells like burning plastic, unplug it immediately. Operating overheated equipment may cause a fire or electrical failure.
Interference and interference from neighboring networks
In apartment buildings, the airwaves are oversaturated with signals. Your router isn't operating in a vacuum, but surrounded by dozens of other access points. If you and your neighbors are using the same channels, especially in a crowded band, 2.4 GHz, data collisions occur. The router is forced to constantly retransmit packets, which dramatically reduces the actual speed.
Sources of interference can come not only from other Wi-Fi networks, but also from household appliances. Microwave ovens operating at 2.4 GHz, Bluetooth headsets, wireless security cameras, and even fluorescent lamps can create Electromagnetic noise. This noise "drowns out" the useful signal, making the connection unstable.
To diagnose noise levels and channel congestion, you can use specialized smartphone apps (such as Wi-Fi Analyzer). They will display a graphical representation of the airwaves and help you select the least congested channel. Automatic channel selection in the router settings often doesn't work correctly; manually selecting a free frequency is preferable.
How does a microwave affect Wi-Fi?
Microwave ovens emit powerful 2.4 GHz waves. Although the oven's shielding should prevent leakage, older or damaged models can create strong interference within a radius of several meters, completely jamming Wi-Fi while heating food.
Diagnostics: How to Find Network Weaknesses
Before purchasing a booster, it's important to accurately determine the cause of the problem. Start with a visual inspection: where the router is located, are there any metal objects nearby, and is it covered by decorative elements? Then, run a speed test in different areas of the apartment using apps like Speedtest or built-in OS tools.
Pay attention to the signal strength (RSSI) in decibels (dBm). A value of -30 dBm indicates a perfect connection, -60 dBm is good, and anything below -80 dBm is considered extremely unstable and unsuitable for comfortable operation. If the signal strength in the problematic room is below -80 dBm, software adjustments will no longer help; the physical infrastructure will need to be replaced.
☑️ Primary network diagnostics
It's also worth checking that your router's firmware is up to date. Manufacturers frequently release updates that improve signal processing algorithms and connection stability. Access your router's web interface (usually at 192.168.0.1 or 192.168.1.1) and check for updates in the section System Tools or Administration.
Practical Solutions: From Rearrangement to Mesh Systems
The simplest and most cost-effective solution is to relocate your router. Try to place it as close to the center of your apartment and as high as possible. Avoid placing it on the floor, in closets, or behind TVs. Even moving the router 1-2 meters toward a window or hallway can improve signal strength in adjacent rooms by 10-15%.
If repositioning the antennas isn't possible or doesn't help, consider replacing them with more powerful ones (with higher gain). However, remember that an antenna only amplifies the signal in one direction: if the router is "shouting" louder, that doesn't mean your smartphone in another room will be able to "shout" loudly enough in response. Power balance is important.
For large apartments and houses with thick walls, the ideal solution is Mesh systemsUnlike simple repeaters that cut speeds in half, mesh nodes create a seamless network with intelligent client switching. You place one unit at the entrance and a second in the back room, and they connect, providing coverage throughout the entire area.
⚠️ Note: Using cheap Wi-Fi repeaters often results in a 50% drop in overall network speed, as they operate in half-duplex mode. For mission-critical applications, it's better to use a wired connection or mesh technology.
Configuring your router for maximum coverage
Properly configuring your router's software can work wonders. First, switch your wireless network mode to mixed (b/g/n or ac/n) to prevent older devices from slowing down newer ones. For the 2.4 GHz band, set the channel width to 20 MHz—this will improve stability and penetration, although it will reduce the maximum theoretical speed.
Turn on the function MIMO (Multiple Input Multiple Output), if supported by your hardware. This allows you to transmit multiple data streams simultaneously using multipath propagation. It's also worth experimenting with the Transmit Power, setting it to maximum (High or 100%) if this option is available in the advanced settings.
Recommended settings for 2.4 GHz:Mode: 802.11 b/g/n mixed
Channel Width: 20 MHz
Channel: 1, 6, or 11 (least busy)
Power: High
Don't forget about security. Using an outdated encryption protocol WEP or WPA/TKIP may reduce network performance. Please go to WPA2-PSK (AES) or WPA3, which will ensure not only protection, but also optimal equipment speed.
Why does the internet work worse in the evening than during the day?
In the evening, when all the neighbors return home and turn on the internet, the load on the provider's channels and the airwaves increases exponentially. This leads to collisions and a reduction in available bandwidth. Furthermore, connecting a large number of electrical appliances to the network can create additional interference.
Can weather affect Wi-Fi inside an apartment?
The weather outside doesn't directly affect the signal inside an apartment, as the walls shield most external influences. However, severe thunderstorms or magnetic storms can interfere with electronics and radio channels in general, which could theoretically impact connection stability, although this is rare.
Is it worth buying a router with more antennas?
The number of antennas doesn't always equate to signal quality. Four antennas are often needed for MIMO technology and support for both 2.4 and 5 GHz bands simultaneously. It's more important to pay attention to transmitter power (measured in dBm), the presence of signal amplifiers (FEM), and support for modern standards (Wi-Fi 6/6E) than simply the number of antennas on the device.