WiFi Bridges allow Wi-Fi clients to connect to an Ethernet network. Wireless WiFi Bridges are generally required to provide links over long distances. In order to do this the devices must focus the RF energy. In its most basic form a wireless bridge is created by linking 2 access points together. One access point adopts the role of being an ‘access point’ and the other the role of being a ‘client’ or ‘station’.
The client access point connects to the other access point in a very similar way to how a client device such as an iPad or laptop would connect to a normal everyday access point. The difference with a point-to-point wireless bridge is that the connection is an exclusive one between the 2 devices. Another key difference is that wireless bridges are very directional. In most access points the RF energy is transmitted in a 360degree coverage pattern.
This is useful in wireless networking as usually the client devices are either mobile or there are multiple of them. This means that the access point needs to be able to connect to them wherever they may be in relation to it. With wireless WiFi Bridges however, in most cases both points are fixed so any RF energy not directed towards the other device forming the bridge is effectively wasted.