When choosing new home network equipment, buyers often make the same mistake: they automatically select the model with the most external antennas, believing this guarantees maximum speed and signal penetration through walls. This is a common misconception, rooted in the days of the 802.11n standard, when each antenna actually operated independently and directly impacted range. However, modern technology has advanced greatly, and the physics behind the process has become much more complex and interesting.
Today, the number of antennas is just the tip of the iceberg, behind which lies a complex architecture MIMO (Multiple Input Multiple Output) and beamforming technologies BeamformingA cheap router with four protruding antennas may perform worse than a compact modern model with only two or three built-in components if their internal circuitry and software are poorly designed. Understanding how antennas interact with radio waves will help you avoid overpaying for plastic "space" on the store shelf.
In this article, we'll take a detailed look at the role antennas play in coverage, why their number is no longer a direct indicator of power, and what you should really pay attention to when purchasing a device for a large apartment or office.
The Physics of the Process: How Antennas Transmit Signals
The main function of an antenna in a wireless router is to convert the electrical current flowing through a conductor into electromagnetic waves that propagate through space, and vice versa. The more antennas, the more radio channels that can be used simultaneously for data transmission. However, there's an important nuance: antennas don't simply "boost" the signal; they create spatial flow data.
In older standards, each antenna transmitted a single stream. Modern systems use technology MIMO, which allows multiple data streams to be transmitted simultaneously over the same frequency band. This significantly increases channel throughput without increasing spectrum bandwidth. If a router has three antennas, it can theoretically support a 3x3 configuration, transmitting three independent data streams simultaneously.
Signal polarization is also important to consider. Antennas can be positioned vertically, horizontally, or at an angle. Correct orientation of the receiver antennas relative to the transmitter is critical for connection quality. If the router's antennas are only vertically positioned, but your smartphone's antenna is horizontally oriented (which often happens when you hold the phone horizontally while watching videos), the signal strength may drop.
⚠️ Attention: Replacing the standard antennas with more powerful ones (with higher gain, for example, 8 dBi instead of 5 dBi) without appropriately reconfiguring the router's output stage may lead to overheating of the radio module and device failure. Not all routers support antenna replacement.
Thus, antennas affect not only the range, but also direction Signal propagation. An omnidirectional antenna radiates a signal evenly in all directions (like a donut), while directional antennas focus the energy into a narrow sector. The number of antennas allows these effects to be combined, creating a more complex radiation pattern.
Impact on data transfer speed
The number of antennas has the most significant impact on the maximum theoretical wireless connection speed. In the Wi-Fi 5 (802.11ac) and Wi-Fi 6 (802.11ax) standards, speed is directly related to the number of spatial streams a device can handle. If your router has four antennas and supports a 4x4 configuration, it will be able to transmit more data per unit of time than a 2x2 model.
However, it's important to understand that speed increases only as long as the client device (laptop, phone) can receive this stream. Most modern smartphones are equipped with only two antennas (2x2 configuration). This means that even if you connect such a phone to a powerful router with eight antennas, it will only be able to use two streams simultaneously. The router's remaining antennas can then be used for other clients or to improve reception quality.
Technology MU-MIMO Multi-User MIMO (MIMO) allows a router to communicate with multiple devices simultaneously by using different antennas for different clients. A router with a large number of antennas can effectively distribute traffic among multiple devices without creating queues. In a smart home scenario, where dozens of sensors, cameras, and TVs operate simultaneously, this becomes critical.
Achieving maximum speeds in the 5 GHz band, especially when using a 160 MHz channel, requires a sufficient number of antennas. For example, achieving 2402 Mbps in the Wi-Fi 6 standard requires a 2x2 configuration and a 160 MHz channel, which requires a high-quality antenna system.
The myth of signal range of a different ability
There's a persistent myth that the more antennas you have, the further the signal will reach and the better it will penetrate concrete walls. The reality is that range primarily depends on transmitter power (measured in dBm) and the sensitivity of the receiver, as well as the gain of the antennas themselves (dBi), and not their number.
Four antennas won't improve the signal strength if the radio module's power is limited by law (usually 100 mW or 20 dBm for 2.4 GHz). However, having multiple antennas allows for the implementation of the technology. BeamformingThe router analyzes the location of clients and forms a focused signal beam specifically toward them, instead of dispersing energy in all directions. This can visually improve the signal in a distant room.
Additionally, additional antennas are often used to separate bands. For example, in a three-antenna router, two antennas can operate at 2.4 GHz and one at 5 GHz, or they can operate in redundant mode. If one antenna encounters interference (from a microwave oven or a neighboring router), the system automatically switches to the other, ensuring a stable connection.
⚠️ Attention: Signal penetration depends primarily on frequency. The 5 GHz band has less wall penetration than 2.4 GHz, regardless of how many antennas your router has. For large apartments with load-bearing walls, more antennas won't help; you'll need a mesh router or access point.
It's also important to note the role of diversification. When there are multiple antennas, the router can select the one that currently receives the best signal from the client. This helps combat signal fading, when waves reflected from walls cancel each other out.
Why do antennas sometimes need to be rotated?
If your router has external antennas, they don't always need to be pointed straight up. To improve reception in a multi-story building (high/low) or with horizontally polarized client devices, adjusting the antenna angle can improve signal quality by 10-15%. Experiment with 45-degree angles.
MIMO and MU-MIMO Technologies: Why They Matter
Abbreviation MIMO MIMO means the device can simultaneously receive and transmit multiple data streams. The number of antennas determines the MIMO class. A 4x4 MIMO device has four transmit and four receive antennas. This allows for increased throughput proportional to the number of streams.
Technology MU-MIMO takes this idea further by allowing a router to transmit data to multiple devices simultaneously. Think of a router as a cashier at a store. A standard router (SU-MIMO) serves customers one at a time, even if it's very fast. A router with MU-MIMO and a sufficient number of antennas can serve several customers simultaneously, opening additional checkout lanes. To do this, it needs a reserve of antennas.
Implementing these technologies requires complex internal wiring. Antennas must be spaced a certain distance apart (usually half a wavelength or a quarter wavelength) to avoid interference with each other. This is why compact routers with a large number of antennas are often located inside the case along the perimeter, rather than assembled into a bundle.
- 📡 Spatial coding: Using multiple antennas to transmit copies of the same signal with different delays, which increases reception reliability.
- 🔄 Spatial multiplexing: Transmitting different data through different antennas to increase speed.
- 🎯 Beam Formation: Phasing the signal on different antennas to focus energy in the desired direction.
Without a sufficient number of antennas, modern Wi-Fi 6 and Wi-Fi 6E standards simply won't be able to reach their full potential. Therefore, when purchasing a high-end router, the presence of 4, 6, or 8 antennas (even if they're hidden internally) is a must for advanced features.
Internal and external antennas: is there a difference?
Many users still believe that if the antenna isn't visible (it's inside the case), the Wi-Fi will be weak. This misconception comes from the era of cheap routers, when they skimped on everything. In modern flagship models (Asus RT-AX86U, TP-Link Archer AXE) high-quality internal antenna modules are used, which are not inferior in characteristics, and often even superior to external "sticks".
External antennas are convenient because they can be replaced with more powerful or directional ones if needed. They can also be rotated for optimal radiation patterns. However, they take up space, can be accidentally knocked off or unscrewed, and can also damage the interior. Internal antennas are integrated into the housing, which often acts as part of the antenna system (for example, the plastic fins of the housing).
The main difference lies in the standing wave ratio (VSWR) and matching. Factory antennas (internal or external) are perfectly matched to the router module. Cheap external antennas purchased separately may have poor matching, resulting in signal loss despite their "power."
| Characteristic | External antennas | Internal antennas |
|---|---|---|
| Possibility of replacement | High (standard connector) | Missing (requires soldering/opening) |
| Aesthetics | Man-made species, take up space | Minimalism, compactness |
| Directionality adjustment | Possible manually | Fixed (factory) |
| Risk of damage | Tall (can be broken) | Low (protected by the housing) |
The choice between internal and external antennas should depend on your needs. If you plan to live in a standard apartment and don't plan on experimenting with directional antennas, a model with internal antennas will look neater and provide more stable performance.
How to choose a router based on antennas
Hidden factors: quality of components and software
The number of antennas is just hardware. The software that controls these antennas is equally important. Antenna switching algorithms, power calibration, and thermal management play a crucial role. A cheap router with 8 antennas may overheat and slow down, while an expensive one with 4 antennas will fly.
Materials also matter. In high-quality routers, antennas are connected via shielded cables to prevent interference within the case. In budget models, antennas may simply be soldered to the board, which can lead to interference when other components are located close to each other.
Support for security and encryption standards is also important to consider. Processing complex encryption keys requires processor processing power. If the processor is weak, even the best antenna system won't prevent speed drops when WPA3 is enabled.
⚠️ Attention: Router specifications (supported standards, number of MIMO streams) may vary depending on region and firmware version. Always check the specific model's specifications on the manufacturer's official website before purchasing.
Don't forget about cooling. Powerful transmitters and complex antenna systems generate heat. If the router's case doesn't have an effective ventilation system or passive cooling, the device will throttle (reduce performance) under load, negating the benefits of a multi-antenna system.
Final recommendations for selection
When choosing a router, don't go for the highest number of antennas. For a standard apartment up to 70-80 square meters, a high-quality router with two or three antennas (2x2 or 3x3 configuration) running Wi-Fi 5 or entry-level Wi-Fi 6 is quite sufficient. This will provide stable speeds of up to 500-800 Mbps over the air.
If you have a large home, many devices (more than 20), or are an avid gamer who requires minimal ping, then you should consider models with four or more antennas and 4x4 MIMO support. However, remember that in this case, it's crucial that your devices support these standards.
The best strategy would be to choose a router from a trusted brand (Keenetic, Asus, TP-Link, MikroTik), which has good reviews for software stability, not just the number of plastic protrusions on the case. Antennas are important, but they are only one part of a complex wireless communications ecosystem.
Frequently Asked Questions (FAQ)
Will a router with 8 antennas increase internet speed if the provider's tariff is 100 Mbps?
No, internet speed is limited by your internet provider's plan. However, a router with more antennas can improve connection stability, reduce ping in games, and ensure more even speed distribution among multiple devices within the local network.
Is it possible to remove extra antennas from a router so that it takes up less space?
This is strictly not recommended. The router's antenna system is designed to operate in a specific configuration. Removing the antennas will disrupt the impedance matching, which could result in power being reflected back into the transmitter and causing it to burn out. Furthermore, this will dramatically reduce signal quality.
Is it true that antennas should be fanned out?
Yes, that's partially true. If a router has multiple antennas, they shouldn't be stacked or aligned in parallel. It's best to fan them out or position them at different angles (for example, one vertical, one at 45 degrees, and one horizontal) to cover the various signal polarizations from client devices.
Does the wall material have a greater impact than the number of antennas?
Absolutely. Reinforced concrete, mirrors, and thick brick walls can absorb or reflect a Wi-Fi signal almost entirely, regardless of how many antennas your router has. In such cases, the number of antennas is secondary, and the only solution is to install an additional access point or mesh system.
Is it worth buying a router with internal antennas for a large house?
For a large home, the antenna type (internal/external) is less important than the network scalability. It's better to buy a router with internal antennas but also mesh technology support, and add a satellite to it, than to rely on a single powerful "base" with external antennas.