Does an industrial router with more antennas have a stronger signal? Is there a direct relationship with the number of antennas?
In the eyes of most consumers, many people prefer to choose the "more" products, then the wireless industrial router antenna is really the more the better?
As we all know, the antenna is an important part of the industrial wireless router, is not the more the number of industrial wireless router antenna, the better the signal of this industrial router? In fact, not, the number of industrial wireless router antennas is not the main factor to determine the strength of the signal. Why, then what is the factor that determines the signal strength of the industrial wireless router?
First of all, we all know that the earlier generation of industrial wireless routers will certainly not have more than one antenna. So it can seem, 802.11n obviously became a watershed, but also from then on the antenna is no longer only a lonely one, so what is the matter? Here we have to mention a 11n protocol after the specific application of multi-antenna technology, is also a very important technology in the field of wireless communications - MIMO (Multiple-InputMultiple-Output, multiple-input multiple-output).
Some people say, why I bought a latest model of 3 antenna support 802.11ac protocol industrial wireless router, the signal strength, coverage and even speed did not go up? Antenna is not enough? In fact, this situation we have to check whether the receiving terminal you use supports the AC protocol. For example, you use the earlier iPhone3, the phone can only support 11a/b/g even 11n can not talk, then even if you give the goods to dismantle the addition of a few antennas is useless, just add AC network card or change the terminal on the line.
Why? If the environment of Wi-Fi application is indoor, the 802.11 series protocols we commonly use are also built for such conditions. Due to various obstacles between the transmitter and the receiver, there is almost no possibility of direct signal when sending and receiving. So what should we do? We call this approach multipath transmission, also known as multipath effect. Multipath, literally well understood, is to increase the transmission path.
Since it is multipath, the transmission distance is long and short, some may be reflected from the table, some may be through the wall, these carry the same information but has a different phase of the signal tossed together eventually gathered on the receiving end. Modern communication is stored and forwarded packet switching, also called packet switching, the transmission is the code (Symbol). Because of the barriers to produce different transmission delays, it causes inter-code interference ISI (InterSymbolInterference). To avoid ISI, the bandwidth of the communication must be less than the inverse of the tolerable delay.
Finally, the perceived strength of the wireless signal is also reflected in the user's receiving equipment. If the reception sensitivity of the device is not high, then the user will feel that the wireless signal is bad and the actual experience of accessing the Internet will be poor. In other words, I transported 100 buckets of water to the door of your warehouse, your warehouse is in disrepair, the door is small, each time you can only move a bucket of water inside, then of course, not fast ah!
So, for most industrial routers, multiple antennas are not the same as a strong signal, let alone a large coverage through the wall. Hope these can help those who need it!
Translated with www.DeepL.com/Translator (free version)
