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Wireless Power Transfer

Wireless power transfer (WPT) is the transmission of electrical energy without wires as a physical link. The technology of wireless power transmission can eliminate the use of the wires and batteries, thus increasing the mobility, convenience, and safety of an electronic device for all users. WPT is useful to power electrical devices where interconnecting wires are inconvenient, hazardous, or are not possible.

In a wireless power transmission system, a transmitter device, driven by electric power from a power source, generates a time-varying electromagnetic field, which transmits power across space to a receiver device that extracts power from the field and supplies it to an electrical load (see schematic above).


Vacuum tubes used in the system design


Wireless power techniques mainly fall into two categories, near field (non-radiative techniques) and far-field (radiative techniques). Both have direct and distinctive commercial applications.

Near field WPT has found application in the design and operation of Quantum and Exascale Computers, which, for the former, it paths the way for low error rates on readout and logical operations; these errors are due to the qubits affecting one another, the very advantage of the QC processing information more efficiently than a classical computer.



Far-field WPT, due to its stringent requirements for vacuum and absolute zero temperatures (see simulation results), has direct application in the transfer of power from outer space, as well as in between transmitter and receiver, also located in the outer space.



This opens the Pandora’s Box of countless applications in the civil and defence sectors, such as the research and manufacturing of pure alloys, semiconductors, and new drugs; asteroid and Moon mining (the “Moon economy”); satellite communications; and space travel and research.



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