The so-called bridge is the use of wired or wireless to make two routers or several routers form a local area network. This allows network signals to travel farther.
Theoretically and practically speaking, the transmission distance of routers is limited. Those theoretical figures are measured or calculated based on idealized circumstances. In practical use, because of walls, various interference and even the good and bad construction materials will reduce and weaken the transmission of wireless signals.
Thus, router bridging appears. The specific operation is also amazing. For example, if a router is upstairs, then using a router to bridge the signal downstairs can achieve wireless signal coverage downstairs. We could even add a router on the side of the road to extend the signal outside.
In practice. The terminal's router signal is absolutely fine. But the Internet speed is not ideal. Here is actually because the wireless bridge signal quality attenuation is very large. We cannot equate signal strength with signal quality.
If you have to, consider placing your router in visible conditions. And the antenna pointing should not be too large. The work of bridging is actually done by the bridge. If there are conditions, try to consider wireless bridging as little as possible, and really want to bridge or use a wire bridge.
Wireless bridging uses half of the bandwidth for the uplink channel and the other half for the downlink channel. Take 2.4G as an example. The actual bandwidth is about 40 Mbit\/s, but only 20 Mbit\/s is used in bridge mode.