From PESWiki

Wireless energy transfer, also known as wireless energy transmission, is the process that takes place in any system where electromagnetic energy is transmitted from a power source (such as a Tesla coil) to an electrical load, without interconnecting wires. Wireless transmission is employed in cases where interconnecting wires are inconvenient, hazardous, or impossible. Though the physics can be similar (pending on the type of wave used), there is a distinction from electromagnetic transmission for the purpose of transferring information (radio), where the amount of power transmitted is only important when it affects the integrity of the signal.

"Two coils with a matched resonance at the exact matching frequency on both ends = wireless power."

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Research and Development

MIT WiTricity

• http://www.witricitynet.com - independent coverage

• MIT's Wireless Power (http://www.technologyreview.com/read_article.aspx?ch=specialsections&sc=emerging08&id=20248) - In the spirit of Tesla's dream of wireless power, MIT physicist Marin Soljacic is working on a way to transmit power wirelessly, both efficiently and safely. Now his work has made MIT Technology Review's TR10 (http://www.technologyreview.com/specialreports/specialreport.aspx?id=25) list for 2008. (MIT Technology Review; March/April 2008)
  

• Electricity in the Air (http://www.popsci.com/scitech/article/2008-01/electricity-air) - If cord-free power delivers on its promise, our "wireless" world will finally live up to the name. Ramifications of MIT's work on WiTricity, bringing Tesla's dream to fruition. (Popular Science; Jan. 23)
  

• MIT Wirelessly Powers a Lightbulb (http://www.physorg.com/news100445957.html) - A team from MIT has experimentally demonstrated lighting a 60W light bulb from a power source seven feet (more than two meters) away; there was no physical connection between the source and the appliance. The MIT team refers to its concept as “WiTricity” (as in wireless electricity). (PhysOrg; June 7, 2007) (See Slashdot (http://hardware.slashdot.org/article.pl?sid=07/06/07/2057236) discussion)
  

Other Groups

• Recharging Gadgets Wirelessly (http://www.technologyreview.com/Infotech/19894/?nlid=757) - A Delaware-based startup called WildCharge (http://www.wildcharge.com/) is selling a small metal pad, about the size of a sheet of paper, that can simultaneously charge multiple devices laid on top of it--as long as they're equipped with adaptors. (MIT Technology Review; Dec. 13, 2007)
  

• Plastic sheet delivers wireless power (http://www.nature.com/news/2007/070423/full/070423-11.html) - Japanese researchers have developed a flexible plastic sheet that can wirelessly transmit power to electronic devices. Desks and walls could one day light up electronics without need for cables. (Nature; Apr. 29, 2007)
  

• Plastic Sheet of Power (http://www.technologyreview.com/BizTech/17898/) - Printing flexible electronics on plastic provides a way to wirelessly power gadgets. Researchers at the University of Tokyo have demonstrated a prototype that consists of plastic and flexible electronics, and can wirelessly supply power to any device that touches its surface. (MIT Technology Review; Dec. 14, 2006)
  

• Charging Batteries without Wires (http://www.technologyreview.com/InfoTech/17791/) - New MIT research reveals a way to send wireless energy to mobile phones and laptops using the principle of resonance. (MIT Technology Review; Nov. 15, 2006) (See also BBC (http://news.bbc.co.uk/2/hi/technology/6129460.stm))

Information

• Project Tesla (http://www.geocities.com/Area51/Shadowlands/9654/tesla/projecttesla.html)
• History of Microwave Power Transmission before 1980 (http://www.kurasc.kyoto-u.ac.jp/space-group/sps/history1-e.html)
• The SHARP's DC-to-DC power transmission system (http://www.friendsofcrc.ca/Projects/SHARP/sharp.html)
• MIT project (http://web.mit.edu/newsoffice/2006/wireless.html)
• MIT at Wireless Power (http://www.engadget.com/2006/11/15/mit-makes-case-for-wireless-power)
• Wireless energy could power consumer, industrial electronics (http://scientificpost.com/2006/11/26/wireless-energy-could-power-consumer-industrial-electronics/)
• Powercast (http://www.powercastco.com/)
• Howstuffworks "How Wireless Power Works" (http://electronics.howstuffworks.com/wireless-power.htm) Describes wireless power transmission over short, medium, and very long distances.
• "'Evanescent coupling' could power gadgets wirelessly", Celeste Biever, NewScientist.com, 15 November 2006 (http://www.newscientisttech.com/article/dn10575-evanescent-coupling-could-power-gadgets-wirelessly.html)

Theory

• Wireless Transmission: A Century of Power Politics Tussles Over "Free" Energy's Price Tag (http://pesn.com/2006/08/03/9500295_wireless_transmission/) - Hidden political interests repeatedly block attempts to bring this energy-saving and cost-saving technology into being. How long will the drama continue before North Americans are able obtain access to that which Russians scientists have already achieved? (PESN; Aug. 3, 2006)

• Wireless Transmission of Electrical Energy (http://freeenergynews.com/Directory/Newsletters/IRI/030318.html#Wireless_Transmission) - Article by Thomas Valone of Integrity Research Institute.

• Tom Bearden on wireless transmission of energy (http://www.zpenergy.com/modules.php?name=News&file=article&sid=1704) - Comments on the seminal work being done by Tom Valone to try to understand what Tesla had accomplished in this area. (ZPEnergy; Jan. 24, 2006)

Related patents

• U.S. Patent 649621 (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=649621) (G.patent (http://www.google.com/patents?q=649621); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=649621)), "Apparatus for Transmission of Electrical Energy".
• U.S. Patent 685953 (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=685953) (G.patent (http://www.google.com/patents?q=685953); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=685953)), "Apparatus for Utilizing Effects Transmitted from a Distance to a Receiving Device through Natural Media".
• U.S. Patent 685954 (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=685954) (G.patent (http://www.google.com/patents?q=685954); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=685954)), "Method of Utilizing Effects Transmitted through Natural Media".
• U.S. Patent 514168 (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=514168) (G.patent (http://www.google.com/patents?q=514168); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=514168)), "Means for Generating Electric Currents".
• U.S. Patent 593138 (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=593138) (G.patent (http://www.google.com/patents?q=593138); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=593138)), "Electrical Transformer".
• U.S. Patent 685955 (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=685955) (G.patent (http://www.google.com/patents?q=685955); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=685955)), "Apparatus for Utilizing Effects Transmitted From A Distance To A Receiving Device Through Natural Media".
• U.S. Patent 685956 (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=685956) (G.patent (http://www.google.com/patents?q=685956); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=685956)), "Apparatus for Utilizing Effects Transmitted through Natural Media".
• U.S. Patent 685957 (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=685957) (G.patent (http://www.google.com/patents?q=685957); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=685957)), "Apparatus for the Utilization of Radiant Energy".
• U.S. Patent 685958 (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=685958) (G.patent (http://www.google.com/patents?q=685958); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=685958)), "Method of Utilizing of Radiant Energy".
• U.S. Patent 787412 (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=787412) (G.patent (http://www.google.com/patents?q=787412); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=787412)), "Art of Transmitting Electrical Energy through the Natural Mediums".
• U.S. Patent 1119732  (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=1119732) (G.patent (http://www.google.com/patents?q=1119732); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=1119732)), "Apparatus for Transmitting Electrical Energy".
• U.S. Patent 1990977 (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=1990977) (G.patent (http://www.google.com/patents?q=1990977); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=1990977)), "Energy transmission system".
• U.S. Patent 2415688 (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=2415688) (G.patent (http://www.google.com/patents?q=2415688); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=2415688)), "Induction device".
• U.S. Patent 6798716 (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=6798716) (G.patent (http://www.google.com/patents?q=6798716); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=6798716)), "System and method for wireless electrical power transmission  (http://www.bpmlegal.com/6798716.html)".
• U.S. Patent 6906495 (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=6906495) (G.patent (http://www.google.com/patents?q=6906495); PDF (http://www.pat2pdf.org/pat2pdf/foo.pl?number=6906495)), "Contact-less power transfer".

See also

• PowerPedia:Wireless transmission of electricity
• 'Wireless Transmission' at FreeEnergyNews.com (http://www.google.com/search?q=wireless+transmission+site:freeenergynews%2ecom) - Google search
• Directory:Microwave-Based Energy Technologies

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