In 1997, wifi was invented.
After the development of 802.11a and b, by the invention of 802.11g in 2003, the performance and coverage of WiFi have been significantly improved, almost able to catch up with the speed of wired networks in the same period.
Subsequently, in 2009, MIMO technology was applied to WiFi, and 802.11n was invented. Without a significant increase in power consumption, the reliability and connection speed of WiFi have been greatly improved.
In 2012, beamforming technology was introduced into wifi to concentrate energy to send information to the target, which is 802.11n. At the same time, this version supports more antennas to improve data transmission efficiency.
Today, iot is a popular concept with the development of wireless connection technology. Almost all devices can be connected to the Internet anytime, anywhere. Users can get almost any data they want.