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The 2.4G and 5G mentioned in the overview title refer to the operating frequency band of the wireless device.

2.4G working band is 2400~2483.5MHz, each channel occupies about 20m. 2.4G is divided into 13 channels. 2.4G working band is mainly based on IEEE 802.11b and other technical standards. The supported modes include 802.11b, 802.11g, 802.11b / g, 802.11b / g / n / ax, bandwidth supports 20MH and 40MHz, and working band is 2.4GHz.

The 5G operating frequency band is 5150MHz~5825MHz, and the larger frequency band makes it have 13 non-overlapping channels (of which 100g / 140 channels are not available domestically). The 5G working band is mainly based on the IEEE 802.11ac technology standard, and the supported modes include 802.11a, 802.11a / n / ac, 802.11a / n / ac / ax, the bandwidth supports 20MH, 40MHz, 80MHz and 160MHz, and the working band is 5GHz.

2.4G and 5G advantages and disadvantages at present, there are many dual-band wireless devices that support dual-band (2.4GHz band + 5GHz band) in the market. the general characteristic of these devices is that they have four independent external antennas. However, at the same time, the wireless terminal can only choose one frequency band to access the corresponding wireless network. So what are the advantages and disadvantages of these two bands?

Next, let's compare these two kinds of frequency bands from two aspects: the effect of crossing the wall and the speed of the network.

The physical characteristic of the electromagnetic wave through the wall is that the longer the wavelength is, the less the attenuation is, and it is easier to continue to propagate around the obstacles. 5G signal has high frequency and short wave length, while 2.4G signal has low frequency and long wave length, so the attenuation of 5G signal is greater when it passes through the obstacle.

Therefore, in the case of the same distance, the wall penetration ability of 5G signal is weaker than that of 2.4G signal, which is the case in all dual-band wireless routers.

The working frequency of the 2.4G band of the network speed is 2.4~2.4835GHz and the bandwidth is 83.5MHz. The working frequency of the 5G band is 5.150~5.725GHz and the bandwidth is 575MHz. For example, the 2.4G band can reach the highest 144Mbps transmission speed under the 20m bandwidth of the 2 × 2 antenna.

At present, wireless terminals support 2.4G band by default, and there are relatively few wireless terminals supporting 5G band.

The bandwidth of the 5G band is wide, and the wireless environment is relatively clean, so the network speed of the 5G band is faster under the same signal strength, which is especially suitable for some applications that require higher network speed and delay, such as download, voice, online games, and so on. For example, the 5G band can reach the highest 866Mbps transmission speed under the 80m bandwidth of 2 × 2 antennas.

The document uses a table to sort out the pros and cons of 2.4G and 5G Wi-Fi:

Which frequency band is more appropriate? To sum up, 2.4G and 5G have their own advantages and disadvantages, but not only one of them. When the wireless network has a complex environment, a variety of terminals and a large number of access, the two frequency bands can be used together to maximize the wireless advantage.

This article comes from the official account of Wechat: ZTE documents (ID:ztedoc)

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