Wireless Power Harvesting

Hoping Mobile No Longer Depending Charger

Nokia desire to create a device that is capable of generating their own resources without depending on the Charger. This technology is called Wireless Power Harvesting. This is a device planted on the phone so no need to fill the power to activate it.

If this becomes reality, will be very efficient considering the charging current is still dependent charger and electricity.

Nokia said charging using technology-based Ambient Radio Waves (Ambient Radio Waves).

"Ambient Electromagnetic radiation from Wi-Fi transmitters, antenna cell phone, TV stations, and the other resources, can be converted into enough electricity to keep the battery remains fully charged", the statement Markku Rouvala, a researcher from the Nokia Research Centre.

Rouvala also said that his group is making the prototype (prototype) that can produce up to 50 miliwatts power. This power is sufficient to slowly recharge the phone active. He said, now is the new prototype is able to produce 3 to 5 milliWatts.

In charging Nokia future, its principles are the same as Crystal Set Radio or Radio Frequency Identification (RFID) with Electromagnetic Waves convert into electrical signals. This conversion will require two passive circuits. "Even if you only get Microwatts, you can still produce energy, provided you do not use the circuit is greater than the recipient," said Rouvala.

To increase the amount of power that can be collected and the range that can be run, Nokia will focus its attention on the results of several frequencies. "It takes a wide band receiver to capture signals from among the 500 megahertz to 10 gigahetz", said Rouvala.

Historically, new technology found in Energy Harvesting Wireless Sensors and RFID powering certain. If Nokia can prove the theory, then this will accelerate the implementation of Energy Harvesting Technology.

In early 2007, Joshua Smith of Intel and Alanson at the University of Washington, Seattle, developed a temperature and humidity sensors that draw power from 1.0 megawatts that emit signals along the 4.1 kilometers on a TV antenna. This technology requires only 60 microwatts power.

However, Smith said that to get 50 milliWatts, they need about 1000 a strong signal and the antenna is able to take on a range of frequencies that will result in loss of efficiency.