Mesh Wi-Fi Systems Hide Antennas for Technical and Design Reasons, Engadget Reports

The report says mesh routers do have antennas, but they sit beneath the surface rather than protruding. While external antennas can maximize range, range is a lower priority for mesh systems because a mesh network is already designed to repeat signals and fill coverage gaps. In a typical setup, the farthest device a mesh node must communicate with is usually another node, establishing a backhaul connection to the main router, while client devices are generally only a room or two away.

Internal antennas are often omnidirectional rather than focused, which the report says helps with seamless connection and handover. A wide radiation pattern allows routers to detect nearby devices quickly and switch connection duties while maintaining relatively consistent bandwidth. External antennas, by contrast, can create problems if they are adjustable and misaligned, potentially reducing connection strength to some devices. They are also long and can be broken during a move or when a router is knocked off a tall surface.

Engadget reports that better mesh routers may need more antennas than usual because they provide a dedicated backhaul instead of sharing that bandwidth with client devices, which can slow those devices down. A large array of external antennas would therefore be more vulnerable, less attractive, and more complex to manufacture. Internal antennas are not without downsides: they sacrifice some range, and the report says there is hypothetically more potential for interference from nearby components. However, it says that issue has been handled in a way that minimizes any impact.

Manufacturing costs also favor internal antennas. External antennas require more parts and materials. For a single router, the added expense may be negligible, but across thousands or millions of units, the bill adds up quickly. Given the networking advantages, the report describes moving antennas inside as a win-win for mesh Wi-Fi vendors.

The design also has a consumer appeal. Internal antennas permit minimalist designs that many shoppers find attractive, which matters when two or three units will be scattered throughout a home. For optimal performance, a router needs to sit in plain sight, and the report says it may be easier to persuade a partner to accept that if the device looks decorative rather than like the radio tower it actually is.