When choosing a modern wireless router, many users first look at the device's external features, the most important of which are the antennas. There's a persistent misconception that the more protruding antennas on the device, the stronger the internet connection and the further the signal penetrates concrete walls. You go to an electronics store and see models with two, three, four, and even eight antennas, and the price difference between them can be significant. A logical question arises: does this number actually directly affect connection quality, or is it just a marketing ploy?
In fact number of antennas This is just the tip of the iceberg, concealing the complex internal architecture of the radio module. Two antennas can provide a much more stable and faster connection than four in a cheap device, if the internal data transmission circuit is configured correctly. In this article, we'll examine the technical aspects of wireless networks so you can choose the equipment that really matters to you, without overpaying for unnecessary components.
Understanding the principles of operation MIMO Using beamforming and wireless routers will help you avoid purchasing mistakes. Users often buy powerful gaming routers for a one-bedroom apartment, where they're overkill, or, conversely, skimp on key components for a larger home. Let's figure out where physics ends and marketing begins.
⚠️ Attention: The antenna's appearance (size or presence) does not guarantee support for the latest WiFi 6 or WiFi 6E standards. Always check the chipset specifications, as manufacturers may use an older radio module in a new housing with multiple antennas.
Physics of the process: how antennas in a router work
To understand how many antennas are actually needed, it's important to understand the basic principles of radio signal transmission. A router's antenna isn't just an amplifier, as many people tend to think, but a converter of electrical signals into electromagnetic waves and back. Gain An antenna's power determines how efficiently it radiates a signal in a given direction, but does not create new energy from the air. Increasing the number of antennas allows the router to use more advanced signal processing circuits.
The primary purpose of a multi-antenna system is to combat multipath propagation. A WiFi signal reflects off walls, furniture, and even people, creating multiple copies that arrive at the receiver at different times. With a single antenna, these reflections can cancel each other out, causing packet loss. Multiple antennas allow a device to select the best signal or combine them, ensuring a stable connection even in challenging conditions.
It is important to distinguish between the concepts internal and an external antenna. In modern compact models, antennas are often built into the case, which makes the device more aesthetically pleasing, but not necessarily less so. The engineering challenge lies in correctly positioning the internal components to avoid interference. External antennas are advantageous because they can be adjusted or replaced with more powerful ones if the standard ones no longer meet your coverage needs.
MIMO technology and spatial coding
The key factor determining the need for multiple antennas is technology MIMO (Multiple Input Multiple Output). It allows for the transmission of multiple data streams simultaneously through different antennas, dramatically increasing channel throughput. For example, a router supporting 2x2 MIMO uses two antennas for transmitting and two for receiving, theoretically doubling the speed compared to a single-stream SISO system.
As WiFi standards evolved, the MIMO scheme also evolved. If in the era WiFi 4 (802.11n) 2 or 3 antennas became the standard, then WiFi 5 (802.11ac) And WiFi 6 (802.11ax) 4x4 and 8x8 schemes were introduced. This means that achieving the maximum speeds in these standards requires a corresponding number of antenna paths. However, it's worth remembering that the client device (your smartphone or laptop) must also support a similar scheme to reap the benefits.
There is also technology MU-MIMO, which allows the router to communicate with multiple devices simultaneously, rather than switching between them at breakneck speeds. For MU-MIMO to work, it's critical to have at least three to four antennas to create separate spatial streams for different users. Without a sufficient number of antennas, the router won't be able to effectively distribute traffic in a dense smart home network.
- 📡 SISO: One antenna for transmitting and one for receiving, basic speed, low stability.
- 🚀 SU-MIMO: Improved speed for a single device by splitting streams.
- 🏢 MU-MIMO: Simultaneous operation with several gadgets requires 4 or more antennas.
- 🔄 Beamforming: Beamforming requires at least 3 antennas to calculate the signal phase.
Therefore, if you have multiple devices connected via WiFi in your home, having more antennas is not just desirable, but essential for comfort. A router with a single antenna will simply choke when trying to simultaneously serve a 4K TV, a gaming laptop, and a smartphone video call.
The impact of the number of antennas on speed and coverage
Many users mistakenly believe that adding each new antenna linearly increases the network's range. This is not true. WiFi coverage Depends primarily on the transmitter power and receiver sensitivity, as well as the antenna gain (measured in dBi). Four antennas with a gain of 2 dBi will not penetrate a wall better than one antenna with a gain of 8 dBi, unless spatial processing algorithms are used.
However, a larger number of antennas allows the technology to be implemented Beamforming (Beamforming). Instead of radiating the signal uniformly in all directions (like a sphere), a router with multiple antennas can focus the signal directly on the client. This doesn't increase the physical transmitter power, but it improves the signal-to-noise ratio at the receiving point, effectively expanding the coverage area and increasing speeds at the edge of the coverage area.
Connection speed also directly depends on the number of antennas, through channel width and the number of spatial streams. The table below compares typical configurations and their impact on theoretical speed in the WiFi 5 standard (AC1200 and above):
| Antenna configuration | MIMO technology | Data stream (2.4 GHz) | Data Stream (5 GHz) | Recommended use |
|---|---|---|---|---|
| 1 antenna | SISO | up to 150 Mbit/s | up to 433 Mbps | Small apartments, IoT devices |
| 2 antennas | 2x2 MIMO | up to 300 Mbit/ | up to 867 Mbps | Standard for most apartments |
| 3 antennas | 3x3 MIMO | up to 450 Mbps | up to 1300 Mbps | Houses with media content |
| 4 antennas or more | 4x4 MIMO / MU-MIMO | up to 600 Mbps | up to 1733 Mbps+ | Gaming, 4K/8K streaming, office |
It's important to note that actual speeds are always lower than theoretical ones due to protocol overhead and interference. However, the trend remains: more antennas (assuming they're supported by the router and client) mean a wider "pipeline" for your data. Two antennas are often sufficient for watching Full HD video, but for downloading large files or online gaming, it's best to aim for models with four antennas.
Why doesn't the speed increase proportionally to the number of antennas?
The point is that antennas serve not only to increase speed but also reliability. Additional antenna paths are often used for error correction and interference compensation, not just for transmitting the payload.
Dual-band routers and antenna distribution
Modern routers are almost always dual-band, operating simultaneously in both 2.4 GHz and 5 GHz frequencies. The number of antennas plays a particularly important role here, as they must service two different bands. Manufacturers often use a single antenna for both bands (a dual-band antenna), but more expensive models may have separate or specialized antennas. If a router has four antennas, they can be distributed, for example, as two for 2.4 GHz and two for 5 GHz, or operate in a flexible mode.
The 5 GHz band has a shorter wavelength and penetrates obstacles less effectively, so beamforming technology (requiring multiple antennas) is critical. Meanwhile, the 2.4 GHz band has a longer range but is heavily polluted by neighboring noise. Separate antenna paths allow the router to more efficiently switch between bands or use them simultaneously for different clients (Smart Connect).
When choosing a device, pay attention to the specification, such as AC1200 or AX3000. These numbers indicate the overall speed. If a router has four antennas but only supports AC1200, this may mean two antennas operate at 2.4 GHz (up to 300 Mbps) and two at 5 GHz (up to 867 Mbps). More powerful models, such as the AX5400, have four or six antennas that enable high speeds in the 5 GHz band, where most traffic is concentrated today.
⚠️ Attention: Not all antennas in a router are active simultaneously on all frequencies. In some budget models, additional antennas may be decorative or serve only for receiving, not transmitting. Always check the chipset specifications (e.g., Broadcom, Qualcomm, MediaTek) on the manufacturer's website.
Use Cases: How Many Antennas Do You Need?
The answer to the question "how much is needed" depends entirely on your needs and the layout of your space. There's no one-size-fits-all number. Let's look at some typical scenarios to help you make your choice.
For one-room apartment For a studio up to 40 square meters, a router with two internal or external antennas is often sufficient. Walls don't pose significant obstacles, and the number of devices is usually small. Buying a powerful device with eight antennas in this case would be a waste of money, as you won't be able to fully utilize its potential, and the excess signal strength can even create echoes in a small space.
For two- or three-room apartment For a home office (60-90 sq. m), the optimal choice is a router with 3-4 antennas and Wi-Fi 5 or Wi-Fi 6 support. This will provide coverage through a single wall and allow for comfortable video playback. If the layout is complex (such as a corridor system), it's better to consider a system with multiple routers or a mesh system, where each module can have two antennas, but together they will create a unified network.
For big house For a network or office with multiple users, the number of antennas in a single router won't save the day. Proper network topology is more important. However, if choosing an access point for a room or open space, models with 4-8 antennas and MU-MIMO support are preferable, as they can effectively serve dozens of clients simultaneously, distributing the load.
☑️ Router Selection Checklist
Internal and external antennas: is there a difference?
Antenna form factor is a common concern for homeowners. External antennas typically have higher gain (usually 5 dBi versus 2-3 dBi for internal antennas) and can be redirected. If the router is located in a niche or behind a sofa, rotating the external antennas vertically can significantly improve the signal.
Internal antennas are integrated into the housing and tuned by engineers at the factory. In high-quality models (for example, from Keenetic, Asus or MikroTik) They perform just as well as external antennas, and sometimes even better, thanks to their precise alignment with the board. However, in cheap plastic enclosures, internal antennas can be shielded by metal components of the board, reducing their effectiveness.
If you plan to use the router in a location with very challenging reception conditions (a basement, thick brick walls, a hangar), then having external antennas that can be replaced with directional ones or high-gain antennas (e.g., 9 dBi) becomes crucial. Internal antennas are not replaceable.
Frequently Asked Questions (FAQ)
Is it possible to increase internet speed simply by adding additional antennas to the router?
No, unless your router has connectors for additional antennas and the appropriate internal circuitry. Simply gluing an antenna to the outside without connecting it to the board won't have any effect. If connectors are present, replacing the stock antennas with more powerful ones (with higher dBi) may slightly improve stability, but won't increase speeds beyond your provider's plan.
Does antenna placement affect WiFi speed?
Yes, it does significantly. Antennas emit a signal in a donut-shaped pattern perpendicular to their axis. If the antenna is vertical, the signal propagates horizontally. If you lay the router on its side or tilt the antenna, the coverage area will change. The optimal position is with the antennas pointing vertically upward.
Is a router with 8 antennas necessary for a typical apartment?
In 95% of cases, no. For a typical apartment, even four antennas are overkill, unless it's a mesh system. Eight antennas are typically used in high-end gaming models or professional access points to ensure MU-MIMO at high speeds in environments with strong interference from neighbors.
Is it true that WiFi 6 only works with 4 antennas?
No, the WiFi 6 (802.11ax) standard can operate with two antennas (2x2). However, the new standard's maximum benefits, such as OFDMA and improved MU-MIMO, are better realized in configurations with four or more antennas. Basic support of the standard does not require multiple antennas.