What is Wi-Fi?
It is a facility allowing devices like computers, smartphones to connect to the Internet wirelessly or to communicate with each other wirelessly by using radio waves to provide network connectivity.
Wi-Fi occupies the radio frequency band of the electromagnetic spectrum between actual radio waves and microwaves. This frequency band means that Wi-Fi routers and computers can send and receive data as electromagnetic wave that have a 3 to 5 inch distance distance between each pulse of the wave.
Wi-Fi transmitters are an antenna equipped with a transmission protocol that splits the frequency band into several segments, referred to as channels. Data can be transmitted over each channel or in order to send and receive greater quantities of data at faster rates.
Wi-Fi fields are usually spherical or ellipsoidal and extend about 20-30 meters, assuming a typical off the shelf Wi-Fi router.