Abstract
A decade ago, non-radiative wireless power transmission re-emerged as a promising alternative to deliver electrical power to devices where a physical wiring proved impracticable. However, conventional “coupling-based” approaches face performance issues when multiple devices are involved, as they are restricted by factors like coupling and external environments. Zenneck waves are excited at interfaces, like surface plasmons and have the potential to deliver electrical power to devices placed on a conducting surface. Here, we demonstrate, efficient and long range delivery of electrical power by exciting non-radiative waves over metal surfaces to multiple loads. Our modeling and simulation using Maxwell’s equation with proper boundary conditions shows Zenneck type behavior for the excited waves and are in excellent agreement with experimental results. In conclusion, we physically realize a radically different class of power transfer system, based on a wave, whose existence has been fiercely debated for over a century.
Highlights
All the existing WPT systems (Inductive, magnetic resonance and capacitive; far field systems not included) rely on critical coupling between coils of the transmitter and receiver for efficient delivery of power[2,3,4,5,6,7]
We wish to draw the attention to Zenneck wave (Sommerfeld-Zenneck wave), which resides at the metal-air interface, akin to surface plasmons (SP) and surface waves (SW)[10,11]
We demonstrate the physical realization of a ZW non-radiative power transmission using the arrangement of a planar ground backed impedance (GBI) surface and a half wave helical transformer at radio frequency (RF)
Summary
Sai Kiran Oruganti1,2*, Feifei Liu[2], Dipra Paul[1], Jun Liu[3], Jagannath Malik[1], Ke Feng[2], Haksun Kim[1], Yuming Liang[2], Thomas Thundat3* & Franklin Bien1*. We demonstrate, efficient and long range delivery of electrical power by exciting non-radiative waves over metal surfaces to multiple loads. It has been well understood that the need for a critical coupling leads to peak splitting phenomena for multiple resonant devices[7] This causes efficiency degradation and are unsuitable for emerging fields such as, internet of things (IoT) and dynamic charging of electrical vehicles. We demonstrate the physical realization of a ZW non-radiative power transmission using the arrangement of a planar ground backed impedance (GBI) surface and a half wave helical transformer at radio frequency (RF). While efficient transmission of non-radiative, wireless power over long distances using earth as a conductor is far from practical realization, it may be possible to utilize already existing metal structures to send guided mode waves for powering electrical devices[1,24,25]. Practical applications include powering Internet of things (IoT) devices, charging for -marine vessels, smart manufacturing floors, and secured shipping containers[24,25,26]
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