EMZETT.Wi-Fi amplifier
In short: A “Wi-Fi amplifier” is meant to extend the range of a Wi-Fi network. In everyday speech the term usually means a Wi-Fi repeater.
In more detail: Technically there are two different things: the repeater, which receives the signal and sends it out again, and real signal amplifiers or stronger antennas. Transmit power is limited by law (about 100 mW EIRP in the 2.4 GHz band in the EU), so simply “turning it up” helps only so much.
In Depth
- Antenna gain: a directional antenna focuses the signal (given in dBi). It improves reception in one direction but weakens it in others.
- Reception is the bottleneck: a phone transmits much more weakly than a router. Even if the router is loud, the device’s reply may not arrive. An amplifier then helps little.
- Noise: an amplifier also amplifies interference.
- Usually better: place an access point closer to the device or use a mesh system.