How does WiFi penetrate walls?

Nowadays, home routers usually come with a few antennas, long and unattractive in appearance. However, most users really like it and believe that the signal emitted by the router with the antenna will be good. Even in remote corners of the home, the WiFi signal displayed on the phone is full, which means the effect of passing through the wall is very good. Is this the case?

Firstly, we need to clarify the issue of which router or phone has weaker WiFi signals.

Due to the main function of the wireless chip of a mobile phone being reception, and considering battery consumption, generally speaking, the signal emitted by the router is much stronger than that of a mobile phone. Therefore, when we place the router in the living room, the signal received by the living room is about 60-70, and after being separated by a load-bearing wall, the attenuation is about 7-10dB. Therefore, the signal received by the mobile phone in the bedroom is still 53-60, even if it is separated by two load-bearing walls, There are also 46-50, which does not affect the coverage of routers in general households.

And the signal of the mobile phone is much weaker. When separated by one or two load-bearing walls, the attenuation is particularly severe, and the signal received by the router from the mobile phone becomes more difficult to recognize. At this time, the mobile phone receives the data sent by the router and sends a confirmation message, telling the router that it can continue sending the next data after receiving the current data. However, due to the router's inability to recognize the confirmation message sent by the mobile phone, We may think that the phone did not receive data and keep trying to resend it, causing a dead cycle. This is why we often see WiFi signals full on the phone, but the data transmission is unsuccessful and it is difficult to access the internet.

Generally speaking, how to solve this problem?

In fact, this is a problem with hearing aids. The elderly person's ears are not very good, and when they talk to you, they can't hear you, but they think you haven't heard them, so they try to speak loudly, just like the antenna of our router, doing more and more, and doing longer and longer. You have already heard very harshly, and they don't know yet. But once they put on hearing aids to help them hear you speak, the problem is solved.

WiFi is also the same. Adding many long antennas to routers will only fill homes with "harsh" WiFi signals, which not only does not help solve the problem, but also generates excess electromagnetic radiation, planting hidden dangers for physical health. Industrial DTU

The best solution is to improve the router's listening ability. This parameter is called acceptance sensitivity, or minimum acceptance sensitivity, which means that when the router hears a signal greater than this threshold, the router can identify and process the signal. When the signal heard is less than this threshold, it is considered noise and discarded without processing. Generally speaking, there are three ways to improve the acceptance sensitivity. One is to use a better enterprise grade WiFi chip, which is inherently sensitive; The second one is to add an amplifier, but it often brings other problems; The third is to increase the antenna to increase the gain of the received signal, but on the one hand, the increase is limited. On the other hand, the antenna has directionality, some directions are enhanced, while others are weakened. The user does not adjust the direction of the antenna, and if the antenna is placed incorrectly, it is better not to have a skyline.

I used to work at a global enterprise level router company, including a technology driven startup, and had some original methods because the WiFi environment was complex and each household was different. Simply increasing this sensitivity can sometimes amplify the signal to act as a hearing aid, and sometimes amplify the noise, causing the hearing aid to sound. So if the router is allowed to automatically collect information about the surrounding WiFi RF environment, using relatively intelligent technology with built-in models, and allowing it to dynamically adjust this acceptance sensitivity, it often achieves miraculous results. 5G Industrial Router

That's why they are all small boxes, and enterprise grade routers are usually sold for thousands or tens of thousands of yuan (of course, sensitivity is only a small factor, and there are many similar issues). At this time, due to price reasons, it is actually difficult for households to use them. Vehicle Router