Power Over WiFi, To A Limited Extent
Adding Tiny Microwave Oscillators Can Allow Some Devices To Be Powered Over WiFi
There is some interesting research out of Singapore and Japan, which involves devices they refer to as spin-torque oscillators. Regardless what the tinfoil hats believe, you really can’t push a lot of power of any sort over 2.4 GHz microwaves so the devices this will work with will be limited. Think of devices that could run off of a small capacitor, like an LED light or a sensor when plotting what you could do with this technology, if it does arrive. The example provided at Physicsworld
The real trick in these experiments was to connect multiple STOs together so that power over WiFi could offer more utility than the initial example. They found that pairing STOs using radio-frequency electrical signals let them charge a capacitor for 5 seconds and then powering a 1.6-volt LED for 1 min. The hope is that they can find a way to connect many of these nanoscale devices together in parallel to increase the amount of time that an LED could be powered over WiFi and to increase the capability to power slightly more energy hungry devices.
Check out the brief at Physicsworld, and their link to the research if you are so inclined.
Yang’s team propose that this energy could be harvested to provide a wireless power source for small electrical devices, which would operate without any need for batteries. Their idea is based around emerging devices called spin-torque oscillators (STOs).