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Wireless Power Transmission
ABSTRACT:

The technology used for wireless power transmission is known as witricity. Wireless power transmission is not a new idea, Nikola Tesla proposed theories of wireless power transmission in the late 1800s and early 1900s. Tesla's work was impressive, but it did not immediately lead to wide spread practical methods for wireless power transmission. Since then many researchers have developed several techniques for moving electricity over long distances without wires. Some exist only as theories or prototypes, but others are already in use. In 2006 researchers at Massachusetts Institute of Technology led by Marine Soijacic discovered an efficient way to transfer power between coils separated by a few meters. They have dubbed this technology as “witricity”. The physical phenomenon of long-lifetime resonant electromagnetic states with localized slowly-evanescent field patterns used to transfer energy efficiently over non-negligible distances like 8 times the radius of the coil, even in the presence of extraneous environmental objects was experimentally demonstrated.