Abstract
For the application of resonant inductive coupling for wireless power transfer, fabrication of flat spiral coils using ribbon wire allows for analytic expressions of the capacitance and inductance of the coils and therefore the resonant frequency. The expressions can also be used in an approximate way for the analysis of coils constructed from cylindrical wire. Ribbon wire constructed from both standard metals as well as high temperature superconducting material is commercially available, so using these derived expressions as a basis, a fully analytic treatment is presented that allows for design trades to be made for hybrid designs incorporating either technology. The model is then extended to analyze the performance of the technology as applied to inductively coupled communications, which has been demonstrated as having an advantage in circumstances where radiated signals would suffer unacceptable levels of attenuation.
Highlights
The principal behind Resonant Inductive Coupling (RIC) was first recognized and exploited by Tesla (Tesla, 1914), and its potential is often seen demonstrated by the operation of the eponymic Tesla coil
The remainder of the paper looks at the application of a hybrid RIC system to close-range communications that would be impervious to the attenuation experienced by radiative systems
Differentiating the second expression for power given in Eq (11) with respect to the load resistance, the maximum power is delivered when the load resistance is equal to the total dissipation, a result found in (Sedwick, 2009)
Summary
The principal behind Resonant Inductive Coupling (RIC) was first recognized and exploited by Tesla (Tesla, 1914), and its potential is often seen demonstrated by the operation of the eponymic Tesla coil. A resurgence of interest occurred in large part due to a an analysis (Karalis, 2007) where Coupled Mode Theory (CMT) was used to provide a framework to predict and assess the system performance over medium range distances. These distances are characterized as being large in comparison to the transmit and receive antennas, but small in comparison to the wavelength of the transmitted power. A limitation to operating a superconducting version of RIC is the need to cryogenically cool the HTS components This is more achieved on the transmit side of the system where. The remainder of the paper looks at the application of a hybrid RIC system to close-range communications that would be impervious to the attenuation experienced by radiative systems
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