In the wireless router parameters, you can often see the item of antenna gain, the numerical unit is dBi, and the common ones are mainly marked parameters such as 3dBi, 5dBi or 7dBi. And many netizens don't know what dBi means. Today, Brother Plumb will talk about what dBi means for wireless routers, talk about the meaning of this value, and whether the bigger the dBi is often asked, the better.
What does dBi mean?
In a wireless router, the antenna gain is an important parameter, because it is related to the transmission distance of the router and the ability to penetrate walls, and dBi is the gain size unit of the wireless antenna.
To put it simply, in a wireless router, dBi is a unit used to mark the gain of the router's antenna, and it is one of the professional terms in the term router.
Is the bigger the dBi of the wireless router the better?
At present, most of the common wireless routers are 3dBi, 5dBi or 7dBi by checking the parameters. For users, is the larger the value, the better, or the smaller the better? For this problem, in fact, through the antenna gain diagram below, you can understand it in seconds after reading it.
Schematic diagram of antenna gain and transmission distance
In the case of the same wireless transmission power of the router, the larger the dBi value, the higher the gain, the smaller the vertical angle, and the relatively farther the transmission distance, but the short-distance transmission area is smaller, and the smaller the dBi value, the smaller the gain, the smaller the vertical angle The higher it is, the transmission distance is not far, but the radiation area at close range is relatively larger.
At present, the common wireless routers on the market generally have antenna gain values of 3dBi and 5dBi, while some main through-the-wall routers use wireless antennas with a gain of 7dBi.
For ordinary users, if the family area is not very large, a gain of 3-5dBi is conducive to signal reception. If you simply increase the antenna, although the ability to penetrate walls is enhanced, the covered area is often more prone to signal dead spots. , this type of router often needs to use more antennas to solve the signal coverage problem, and the product price is often much more expensive
