In wireless communication technology, information In wireless communication technology, information travels in the form of electromagnetic signals through air. Electromagnetic spectrum of frequency ranging from 3 KHz to 900 THz is available for wireless communication (Figure). Wireless technologies allow communication between two or more devices in short to long distance without requiring any physical media. There are many types of wireless communication technologies such as Bluetooth, WiFi, WiMax etc. The electromagnetic spectrum range (3KHz to 900THz) can be divided into 4 categories (Figure) - Radio waves, Microwaves, Infrared waves and Visible or Light waves, according to their frequency ranges. Some of the properties of each wave are listed in Table. of these, three are useful for wireless communication.
Electromagnetic Wave Spectrum
