Science, Space and Technology News 2023
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Two loop antennas can transfer power between each other from 18 centimeters apart. Credit: Nam Ha-Van/Aalto Universitythat allowed devices to be charged at any orientation. Now, they have extended that work with a new dynamic theory of wireless charging that looks more closely at both near and far distances and conditions.
“We wanted to balance effectively transferring power with the radiation loss that always happens over longer distances,” says lead author Nam Ha-Van, a postdoctoral researcher at Aalto University. “It turns out that when the currents in the loop antennas have equal amplitudes and opposite phases, we can cancel the radiation loss, thus boosting efficiency.”The researchers created a way to analyze any wireless power transfer system, either mathematically or experimentally.
“This is all about figuring out the optimal setup for wireless power transfer, whether near or far,” says Ha-Van. “With our approach, we can now extend the transfer distance beyond that of conventional wireless charging systems, while maintaining high efficiency.” Wireless power transfer is not just important for phones and gadgets; biomedical implants with limited battery capacity can also benefit.
Reference: “Effective Midrange Wireless Power Transfer with Compensated Radiation Loss” by N. Ha-Van, C.R. Simovski, F.S. Cuesta, P. Jayathurathnage and S.A. Tretyakov, 20 July 2023,SciTechDaily: Home of the best science and technology news since 1998. Keep up with the latest scitech news via email or social media.
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