Published MAY 18, 2021:
R&D Area: Development of techology to Power Small Electronic Devices with Wi-Fi signals:
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Researches at NUS singapore and Japan’s Tohoku University (TU) under Professor Guo Yong Xin and Professor Yang Hyunsoo NUS, developed solution prototype to harness under-used source of energy from Wi-Fi sources.

– Exploit excess signal available at 2.4GHz WIFI radio frequency ;
– Uses series of tiny spin-torque oscillators (STOs) generating microwaves , which is used to convert wireless radio frequencies into energy to power small electronics without using any battery. ;
– With this innovation, small electric gadgets and sensors can be powered wirelessly by using radio frequency waves as part of the IoT

Link to research: https://www.nature.com/articles/s41467-021-23181-1