Radio Waves: Making Telephones Free Of Charging
You may probably never believe that a telephone which does not need a power supply forever. This is true that the engineers in Nokia research center in England claimed that they have developed a kind of telephone that does not need power supply. This new technology can collect the radio waves around to use as a power supply to support a cellphone to work.
Radio waves are a type of electromagnetic radiation which pass through the freespace including the air and the vacuum. It is one of the limited frequency band of the freespace. The upper limiting frequency of radio waves is 300GHz while the lower limiting frequency differs.
There are many applications of radio waves with the earliest application in the navigation use. It was using the Morse telegraph to pass on a message between the ship and the lands. Today, there are many types of radio waves applications, including wireless data nets, different mobile communications and radio wave broadcast.
The radar is the modern device that uses the radio wave technology. A radar can detect the distance by measuring the delay reflected by the wave. Now radars can be classified to many kinds which include the navigation radar, search radars and weather radars.
Apart from the Nokia, researchers in the University of Washington D.C. have also been in the projection. They have developed a kind of sensor for temperature and humidity, and the sensor can collect the radio power 4.1 kilometers away from the television antenna which is 1 mega Watt, however the power is very weak. In the near future, the technology must be developed and be put into use by common people. Related IC for the telephone is: NJU6375.
Questions and Answers
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