The relationship between WiFi signals and routers and WiFi modules

In the The Internet Age, no network feels disconnected from the society in an instant, so you can hear the question: "Do you have WiFi in your home? What's the WiFi password?" Then the question comes, where does the WiFi signal come from? What is the relationship between this WiFi signal and the router and WiFi module? 2.4G Router Module

Firstly, let's clarify the relationship between WiFi signals and routers and WiFi modules; The WiFi module, also known as the serial port WiFi module, belongs to the Internet of Things transmission layer. Its function is to convert the serial port or TTL level into an embedded module that complies with the WiFi wireless network communication standard, with built-in wireless network protocol IEEE802.11b.g.n protocol stack and TCP/IP protocol stack. Whether it's your own WiFi signal or the merchant's WiFi signal, the essential thing is the router. The most crucial role in routers is the WiFi module. Without a WiFi module, the router is like an empty shell to you. It can be said that the WiFi module is the key to converting wired signals into wireless signals for everyone to access the internet. For example, if it is AP routing, the AP WiFi module SKW71 can be used. There are four communication interfaces, USB/WAN/LAN/UART, and the transmission distance can reach 150 meters.
Then, let's learn about what AP is and the AP WiFi module together; AP is a wireless switch. When a wireless AP is connected to a regular Ethernet switch, the wireless network and wired network are seamlessly combined, usually used by multiple wireless routers to expand signal coverage. For example, if the space required for network layout is relatively large, and the first device is placed in a certain area for Router, the wireless signal may become unstable if it is far away. Then you can place the Stöð 2 Wireless Router in the adjacent area, and connect the Stöð 2 to the first one through the network cable, so that the WiFi signal coverage in the entire area will be more uniform. Dual Band Router Module

The AP WiFi module SKW71 is a 1T1R wireless module that complies with the 802.11n Wi Fi standard. It integrates one 24K MIPS processor, two high-speed Ethernet interfaces, one USB2.0 interface, one I2S interface, and multiple GPIOs. Arm Core Module
The main chip of SKW71 is Atheros' AR9331, which can achieve 72.2Mbps data transmission at 20MHz and 150Mbps data transmission at 40MHz under the 802.11n Wi Fi standard. This module supports AP, client, and relay modes, as well as serial WiFi. 5G Module
When is the AP wifi module suitable for use
The communication interface with the WiFi module is a network interface (WAN/LAN)
Hard AP module - module with MCU and operating system
The product has a USB interface as a slave device (such as USB 3G/4G, USB camera, etc.)
A low-cost wireless AP solution compatible with 802.11 n/b/g comes with multiple AP WiFi modules, including SKYLAB's SKW71/72/73/75, which only requires a 3.3V power supply and receiving antenna, making it simple and convenient to use! Therefore, in practical selection applications, engineers can determine the final AP WiFi module based on the actual needs of the product, as well as the size, packaging, frequency range, data rate, transmission power, transmission distance, communication interface, power supply voltage, antenna interface, and other parameters of the WiFi module.