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WiFi-802.11 2.4G频段 5G频段 信道频率分配表
2022-06-26 07:46:00 【多喝烫水-】
WiFi-802.11 2.4G频段 5G频段 信道频率分配表
简单记一下
2.4G 频段
- 中心频率范围2.412GHz-2.484GHz
- 相邻信道中心频点间隔5MHz,相邻的多个信道存在频率重叠,相互不干扰的信道有三组(1、6、11或2、7、12或3、8、13)
- 共划分14个信道,中国可用13个信道(1-13),美国可用11个信道(1-11),各个国家出于安全等等各方面考虑,开放的信道并不一致。要参考国家码和信道顺从表
- WiFi 802.11 b/a/g/n用的频段也有微小差异(802.11b就只有20MHz频宽),参考WiFi 802.11协商速率
- 信道有效带宽20MHz,实际带宽22MHz,其中2MHz为隔离频带
2.4G的频道编号和中心频率:


5G WiFi 频段
频率范围在 5150MHz - 5825MHz,俗称5G Wi-Fi频段,这个频段里面一共有201个信道,但是,能够被Wi-Fi协议所用的信道却很少。原因是5G的频率很特殊,甚至有关国家安全,因为5G wifi的频率与军用雷达频段重合,因此,很多国家基于国家安全考虑,对5G频段持保留态度。
相邻信道中心频点间隔还是5MHz
在中国,只有36, 40, 44, 48, 52, 56, 60, 64, 149, 153, 157, 161, 165这13个信道可以供5G的wifi网络使用。
WiFi的信道默认是20M,早期还有10M的,现在协议里还有,为了提速,可以将2个信道合并在一起组成40M的信道,其中一个作为主信道20M,另外20M作为辅助信道,主信道比辅助频道低,新信道称为 40M+信道,否则为40M-信道,主信道发送beacon报文和部分数据报文,辅信道发送其余报文(根据记忆写的,错了请您指正) ,类似的还有HT80,HT160,所以看信道我们只看20M的信道就行
中国开放的的5G WiFi频段:

5G的频道编号和中心频率:
(黄色标注的范围)
主要参考了HW WiFi国家码和信道顺从表
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