2.4 GHz和5 GHz数字指的是Wi-Fi可用于其信号的两个不同“频段”。一些安装具有 2.4GHz 和5GHz两种带宽的调制解调器的 PC 用户，产品手册表明该设备符合要求，安装后可能会注意到Windows 10计算机仅检测到 2.4Ghz 而不是 5GHz WiFi带宽。在今天的帖子中，我们将尝试描述一些用户可能会遇到此问题的原因。

Windows 11/10 仅检测到 2.4Ghz 而不是 5GHz WiFi带宽

两个频率之间的主要区别在于频段提供的范围（覆盖范围）和带宽（速度）。2.4 GHz频段提供更远的覆盖范围，但传输数据的速度较慢。5 GHz频段提供的覆盖范围较小，但以更快的速度传输数据。

5 GHz^(GHz)频段的范围较低，因为较高的频率无法穿透墙壁和地板等固体物体。但是，较高的频率可以比较低的频率更快地传输数据，因此 5 GHz频段可以让您更快地上传和下载文件。

由于来自其他设备的干扰，您在特定频段上的WiFi连接也可能更快或更慢。^(WiFi)许多支持WiFi的技术和其他家用设备使用 2.4 GHz频段。当多个设备尝试使用相同的无线电空间时，就会发生过度拥挤。5 GHz频段的拥挤程度往往低于 2.4 GHz频段，因为使用它的设备较少，而且它有 23 个通道供设备使用，而 2.4 GHz频段只有 11 个通道。

5GHz WiFi未在 Windows 11/10 上显示

这个问题是由两个主要原因引起的。

1. 由于驱动程序问题，您可能会遇到这种情况。因此，在您执行任何其他操作之前，建议您先更新调制解调器驱动程序^{(update the modem driver)}。
2. 另一个可能的原因是您的计算机可能没有 5GHz 带宽能力。您可以^{(You can check it)}按照以下步骤进行检查。

启动命令提示符（按Windows键 + R。在“运行”^(Run)对话框中键入cmd并按Enter 键^(Enter)）。

在命令提示符^{(Command Prompt)}窗口中，复制并粘贴下面的命令，然后按 Enter^(Enter)。

netsh wlan show drivers

查找支持的无线电类型^{(Radio types supported)} 部分。

如果输出显示如上图突出显示的802.11n 802.11g 和 802.11b 网络模式，则表示计算机仅具有 2.4GHz 网络能力。^(802.11b )

另外，如果显示网卡支持802.11g 和 802.11n 网络模式，则表示计算机只有2.4GHz^(GHz)网络能力。

但是，如果显示适配器支持802.11a 和 802.11g 和 802.11n 网络模式，则表示该计算机具有 2.4 GHz和 5 GHz网络能力。

希望这篇文章能提供信息。^{(Hope this post was informative.)}

5GHz WiFi not showing up on Windows 11/10

The 2.4 GHz and 5 GHz numbers refer to two different “bands” that your Wi-Fi can use for its signal. Some PC users that install a modem with two bandwidths, 2.4GHz and 5GHz, which the product manual indicates that the device is compliant, might notice after installation that the Windows 10 computer detects only the 2.4Ghz and not 5GHz WiFi bandwidth. In today’s post, we will attempt to describe why some users might encounter this issue.

Windows 11/10 detects only 2.4Ghz & not 5GHz WiFi bandwidth

The primary differences between the two frequencies are the range (coverage) and bandwidth (speed) that the bands provide. The 2.4 GHz band provides coverage at a longer range but transmits data at slower speeds. The 5 GHz band provides less coverage but transmits data at faster speeds.

The range is lower in the 5 GHz band because higher frequencies cannot penetrate solid objects, such as walls and floors. However, higher frequencies allow data to be transmitted faster than lower frequencies, so the 5 GHz band allows you to upload and download files faster.

Your WiFi connection on a particular frequency band can also be faster or slower because of interference from other devices. Many WiFi-enabled technologies and other household devices use the 2.4 GHz band. When multiple devices attempt to use the same radio space, overcrowding occurs. The 5 GHz band tends to have less overcrowding than the 2.4GHz band because fewer devices use it and because it has 23 channels for devices to use, while the 2.4GHz band has only 11 channels.

5GHz WiFi not showing up on Windows 11/10

This issue is caused by two main reasons.

1. You might experience this due to driver issues. So before you do anything else, it’s suggested that you update the modem driver first.
2. The other possible reason is that your computer may not have 5GHz bandwidth capability. You can check it by following the steps below.

Launch Command Prompt (press Windows key + R. In the Run dialog box type cmd and hit Enter).

In the Command Prompt window, copy and paste the command below and hit Enter.

netsh wlan show drivers

Look for the Radio types supported section.

If the output shows 802.11n 802.11g and 802.11b network modes as highlighted in the image above, it means the computer has 2.4GHz network capability only.

Also, if it shows that the network adapter supports 802.11g and 802.11n network modes, it means that the computer has 2.4 GHz network capability only.

But, if it shows that the adapter supports 802.11a and 802.11g and 802.11n network modes, it means that the computer has 2.4 GHz and 5GHz network capability.

Hope this post was informative.

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