Jun 132009
Radio Frequency Energy – a source for battery power
Posted by: adimoga in Accesories, Peripherals & Components
It is a concept easy to grasp at: it is a system designated to create power out of the Radio Frequency energy in order to charge batteries. Since we are surrounded by these Radio Frequency devices the potential for creating this system is rather immense. People that need to charge their batteries on regular basis can have this system at handy. Some of the items that create Radio Frequency are WiFi and cell phone antennas, items that are of common use at home and not only.
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The Nokia Prototype, a device for the future, is planned to be conceived to generate power from the Ambient Radiation, thus being able to charge batteries without needing an AC outlet. Markku Rouvala, a researcher from the Nokia Research Centre in Cambridge, UK, together with a group of researchers strive to develop a way through which phones are capable of topping off their batteries by taking power from ambient RF signals.
The type of radiation could come from usual devices, such as: WiFi transmitters, TV antennas, cell phones… Markku Rouvala affirms that the device they had developed, now at the stage of a prototype, could get as much as 50 milliwatts of power. This power would be enough in order to charge a phone that is switched off. He also said that even if one is getting microwatts, one is still able to gather energy, as long as the circuit doesn’t use more power than it’s receiving.
This method of generating power is not at all a new discovery; this method is being used to produce power for wireless sensors and RFID tags. According to Technology Review report, a researcher at the University of Washington created a temperature and humidity sensor that was capable to take the power it needs to activate from a signal that was emitted by a 1-megawatt TV antenna at 4.1 km distance away, but the device required only 60 microwatts.
The Nokia prototypes are to be planned to generate much higher levels of energy from ambient signals, such as the Radio Frequency that can become a energy source for battery power. To obtain 50 milliwatts would need around 1000 strong signals and an antenna able to get such a wide range of frequencies.
On the other hand, researcher and physicist Steve Beeby, is working on vibrational energy and he affirmed that if the other researchers could get 50 milliwatts out of RF Ambient, then he would definitely be put out of business. Rouvala states that it was possible to insert this into a product within a period of three to four years. This technology to be created would not be applied to power a phone alone, but it would be combined with other energy-gathering technology like solar cells.





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