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1, device chip 
The more common transmission devices on the market are wireless bridges and WIFI devices. So, what is the distance between the wireless bridge and the WIFI device? The answer that can be given is that wireless bridges have a long transmission distance. Why is this?
It sounds unbelievable. However, if it takes a long time to engage in wireless monitoring, it will naturally be understood. For example, a flashlight and a light bulb are concentrated in one light and one light is divergent. This metaphor is very easy to understand when it comes to the relationship between wireless bridges and WIFI devices.
Wireless bridges and WIFI devices have one thing in common, that is, they use microwaves for transmission. They are generally in the 2.4G band and 5.8G band.
Then why do you say that the wireless bridge transmission distance is far behind that of WIFI? There are several reasons for this gap:
The chip is the fundamental determinant of device performance. The wireless bridge is mainly used for long-distance wireless transmission. Therefore, the design focus of the wireless bridge chip will be based on factors such as transmission distance, transmission bandwidth, and anti-jamming. The WIFI covers the device chip. The center of gravity of the equipment will be placed on factors such as bandwidth allocation and the number of device connections.
2. Antenna
In fact, wireless bridges are also used for WIFI signal coverage. When wireless bridges are used for WIFI coverage, they are similar to the WIFI equipment. We compare the long-distance bridge mode of the wireless bridge with the signal coverage mode of the WIFI device. Wireless bridges generally use directional antennas for long-distance bridging, so that the microwave transmission direction will be relatively concentrated; and WIFI equipment will use omnidirectional antennas for signal coverage, and the direction of microwave emission is relatively divergent; It will definitely be farther than the divergent transmission distance.
3, receiver
When a wireless bridge bridges over a long distance, a wireless bridge equipped with an antenna is also used as a receiving end, so that the signal reception rate transmitted from the transmitting end can be greatly increased. The receiving end of the WIFI signal is usually a device such as a mobile phone, a tablet computer, or a notebook. The antennas of these devices are generally built-in type and are very small and cannot receive the WIFI signals transmitted farther. Even if the mobile phone is connected to a WIFI signal, but because the signal is too weak to communicate properly, this is also the problem we encounter on weekdays. We obviously connect to a WIFI network but we can't get on the Internet.
Some people may ask, even if the antenna of the mobile phone is weak, the signal tower of the mobile network is usually far away from us. Why can the mobile phone connect to mobile network signals such as 3G and 4G?
Here we must mention the microwave frequency used by the mobile tower.
As mentioned earlier, the microwave frequencies used for wireless bridges and WIFI overlay devices are 2.4G and 5.8G for civilian use. The microwave frequencies of these two channels do not need to be applied to the country when they are used, but the mobile network signal towers are launched. The 3G and 4G signals use frequencies from 1880 to 2655 MHz. These frequencies are lower than 2.4G and 5.8G, and the low-frequency microwave signals travel farther, so the mobile phone can receive these signals. However, the use of these frequency bands must be applied to the country, go to the license before using.
So, to do professional things to make professional, good steel on the knife, WIFI coverage equipment does not require much transmission distance, it is a large range of radiation, the corresponding transmission distance is no way far away. In addition, it is too far and it is easy for people to surf the net, leading to the instability of the network.
The above is a general explanation of why the wireless bridge is farther away than WIFI. Of course, the description is not perfect and there are many objective reasons. We will not go into details here. For the professional wireless monitoring manufacturers, you can tailor the most suitable solution for your specific situation.
November 04, 2019