At the end of the 19th century a German scientist Heinrich Rudolph Hertz proved the existence of the radio wave. In 1901, Guglielmo Marconi of Italy succeeded in his experiment to use a radio wave below 30kHz (long frequency) for radio communications between England and Canada.
At first, the radio wave was used for communications between ships and harbors, or between ships themselves. Then, it became popular among people after broadcasting through the radio station started to be widely used.
At present, the radio wave is an integral part of our lives, and is widely used in various communications systems including cellular telephones, radios, and televisions and used in many places where people experience social, economic, and other daily activities.
We would like to introduce a part of the Spectrum User System in Japan.