Power circuit with RF or Electromagentic waves

Thread Starter

zemanekj

Joined Jan 31, 2019
38
Can you power a circuit with electromagnetic waves, as opposed to a physical connection like with a wire?
 

WBahn

Joined Mar 31, 2012
24,692
Can you power a circuit with electromagnetic waves, as opposed to a physical connection like with a wire?
Yes. It's done every time you use an RFID device.

It's also done with many small appliances that use wireless charging via and two-piece transformer.

There are significant inefficiencies and so powering large circuits is generally impractical.
 

BR-549

Joined Sep 22, 2013
4,936
Not just circuits my friend, this planet gets turned on every morning from EM waves.
 

nsaspook

Joined Aug 27, 2009
6,278
Yes. It's done every time you use an RFID device.

It's also done with many small appliances that use wireless charging via and two-piece transformer.

There are significant inefficiencies and so powering large circuits is generally impractical.
The end-to-end efficiency of most remote EM wave power systems is laughable when compared to wired power transfers.
One highly hyped system 'Coda' uses 140W (the original design used 450W) input AC power for the 8W RF beam-forming phased array base transmitter to deliver 1W of power to a remote station 10 feet away.

The technology is cool but as you say, generally impractical.

A cool example of a phased array directing energy to a point in space (water).
 
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