Wireless and personal communications systems
THE TERM WIRELESS WAS COINED IN LATE NINETEENTH CENTURY WHEN the inventors toyed with the idea of sending and receiving telegraph messages by using electromagnetic fields instead of electric currents. In early twentieth century, the technology became called as radio; video and data broadcasting and communications were added in middle of century and general term electromagnetic communications emerged. The word wireless was relegated to the history.
In late 1980s, the term found new life. Today it is referred to communications, control devices, networking, and security systems in which the signals travel without direct electrical connections.