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Q: How about the wireless system that works in the 2.4 and 5ghz, is it better than the one in 600mhz?

Source: | Author:iweexsite | Release time2024-04-14 | 636 Views: | Share:
Q: How about the wireless system that works in the 2.4 and 5ghz, is it better than the one in 600mhz?
A: This is originally a very complex question, but it can be explained simply.
1) The wavelength of the 600Mhz frequency is about 50cm, and the half-wavelength is about 25cm, which is about the same as the thickness of the wall. Because of the diffraction principle of waves, it is very easy to pass through obstacles below half a wavelength. Therefore, 500Mhz and 600Mhz radios have good wall penetration capabilities. However, the wavelength of 2.4G and 5.8G is too short, and the wall penetration ability is less than 1/4 of 600Mhz.
2) The attenuation capability of 600Mhz radio is better, which is more than 6 times better than that of 2.4Ghz electromagnetic waves. This can be calculated by public announcements.
3) 600Mhz half-wavelength is 25cm. The optimal length of the antenna is half-wavelength, so the antenna is easy to carry.
4) The propagation mode of 600Mhz is mainly linear propagation in space, and the refraction multipath effect is relatively weak and can be ignored. In crowd gathering scenes, the performance of this is very important. Theoretically, this is the overall attribute of the UHF band, and 2.4Ghz also belongs to the UHF band.
5) 2.4G and 5.8G have been widely used in Bluetooth and wifi, and there are too many interference sources.
6) The main advantage of 2..4G and 5.8G radios is that the antenna can be made very short, which is very good for wearable products such as Bluetooth headsets. Our microphone equipment is not that important.
7) The biggest advantage of 2.4Ghz and 5.8Ghz is that they can provide very large bandwidth for data communication. This is very important in the field of mobile communications and can support services such as live video broadcast. But on our voice devices, there is simply no such large amount of data that needs to be transmitted wirelessly.
Therefore, when Bluetooth technology was first defined, it was aimed at the problem of wireless connection in the last 10 meters of mobile communications.
This is the fundamental reason why modern 5G mobile networks require investment in the construction of a large number of base stations. The investment in 5G mobile communications is too great. The number of base stations is more than four times that of the 4G network. This is because too high-frequency radios are used as carriers, and the coverage area is drastically reduced, but the wireless channel rate is greatly increased.
Why do many companies use 2.4Ghz and 5.8Ghz technologies to make wireless handheld products? The reason is: these two technologies are very mature and have ready-made chips, modules, and protocols. Therefore, a lot of basic research and development can be saved. However, because the existing Bluetooth protocol and WiFi protocol are not designed for stage performance scenarios, the delay performance is not good. For example, in a conference system made with 5.8Ghz and wifi protocal, the delay is generally greater than 30ms, and the sound will definitely be half a beat slower.