09-11-2012, 02:20 PM
Wireless energy transfer
Introduction
Wireless energy transfer or wireless power is the transmission of electrical energy from a power source to an electrical load without interconnecting wires. The problem of wireless power transmission differs from that of wireless telecommunications, such as radio. In the latter, the proportion of energy received becomes critical only if it is too low for the signal to be distinguished from the background noise. With wireless power, efficiency is the more significant parameter. A large part of the energy sent out by the generating plant must arrive at the receiver or receivers to make the system economical.
Advantages
• Mobility - user device can be moved easily within the wireless range
• Neat and easy Installation - since no cable running here and there, just start up the wireless device and you're ready to rumble
• Less cost for cabling infrastructure and device
• More user supported - cable device have limited slots whereas wireless does not.
Disadvantages
• Relatively lower bandwidth speed - example: although currently 802.11/n could reach 128 Mbps, UTP cable can reach 1 Gbps. And more user mean each bandwidth get smaller. That is why currently wired backbone network is still preferred.
• Ease of access means more security also necessary to protect data and/or bandwidth, since people can connect anywhere within range without seeking network plug
Applications
Electricity transmission
Floating power
Variable transmission
Power generation