In general, the use environment in the home is more complicated. Whether it is a home appliance or a wall, the wireless signal is blocked, so that there is almost no direct signal from the transmitting end to the receiving end. The wireless signals transmitted back and forth by various items in the home form a phenomenon of "multipath transmission", and the data transmitted to the receiving end by different routes will have a delay phenomenon, so we intuitively feel that the network becomes "card". Until the emergence of "MIMO" technology.
With MIMO transmission technology, multi-antenna support is required. The router can divide the data into multiple copies from different antennas and integrate at the receiving end. Taking 2x2 MIMO as an example, just like two people working at the same time, the original work efficiency is doubled, the wireless speed is improved and the communication quality is significantly improved.
Most of the friends in the purchase of wireless routers will only judge the signal strength of the wireless router based on the number and price of the wireless router antenna. Is the signal of the wireless router more antennas better?
Let's take a simple test and use the WIFI signal test software (WirelessMon) to visually look at the difference in wireless signals. (WirelessMon: wireless network monitoring software), this is a very professional wireless network signal scanning tool, which can quickly scan all the wireless signals near you and test the wireless router signal strength at home to determine the location of the wireless router. . (This software needs to run on a device with a wireless network card)
I looked for the best-selling smart routers on the three Tmall:
1. Xiaomi intelligent router mini two antennas, priced at 129 yuan;
2. Polar route (model: extreme 壹S) two antennas, priced at 99 yuan;
3. Ximo intelligent router (model: W18M) four antennas, priced at 49.9 yuan.
The wireless SSIDs are respectively set to: XIAOmini, HiWiFi_J1S, W18M to distinguish, and no password protection is open mode.
First, we placed the three routers in the room and the results of the tests in the room were:
Note: The above figure shows the signal strength and stability displayed by the software. The horizontal axis of the picture is time, the vertical axis is the signal strength, and the up and down fluctuation is considered to be stable within 20%. (The real stability test requires a certain test cycle, and will be added later)
Then, I took the computer with the test software out of the room and wore a solid wall. The result was:
Data summary:
Note: The signal strength dbm value must be a negative number. The closer to 0, the better the signal, but it cannot be 0.
Conclusion :
The more the number of antennas, the better the signal of the wireless router. However, the good signal does not mean that the more the number of wireless router antennas, the more the antenna will multiply the transmission capability of its wireless signals. The better the force. In fact, the multi-antenna wireless router signal is only 15% to 20% stronger than the signal of the single-antenna wireless router. A simple performance is that the single-antenna wireless router has one signal left after being separated by a wall. The wireless signal of the multi-antenna wireless router is between the single cell and the two cells, and the wireless signal strength difference between the dual antenna and the four-antenna wireless router is not too large.
According to the experimental test results, the number of wireless router antennas is not too great for signal enhancement, but the coverage of wireless signals and the role of reducing signal dead zones are not to be underestimated!
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