Abstract
Abstract This paper presents a general methodology based on the description of the inductive channel as virtual magnetic transmission-lines (VMGTLs). In comparison with other existing methods, VMGTL approach presents a better physical insight of the channel behavior since the model correctly preserves the energy flow between the transmitting and receiving coils. Besides that, it facilitates the integration into the analysis of highly nonlinear and dispersive structures such as metamaterial (MTM) lenses. Particularly, the virtual-TL analogy clarifies that the enhancement of the transmission gain between any two coils assisted by MTM is not due to an enhanced coupling between the drivers, as usually claimed, but to the emergence of propagating near-field modes supported by the MTM. This approach, by means of a parametric study, also indicates, for the first time, that MTMs could be employed not only for the increasing of power but also of data transfer due to the emergence of a sub-resonant region of minimum distortion. Nonetheless, since both effects are mutually exclusive, no passive MTM structure could simultaneously improve power and data transmission.
Highlights
Inductive-coupling based systems have shown to present enormous advantages over any other power and data transmission mechanisms like electromagnetic (EM) or acoustic waves in extreme environments, such as underground or underwater, once the vast majority of the materials in the Universe are magnetic insensitive
The fundamental flaws of these magnetic links remain a challenge for designers
Totally neglected on MTM-enhanced coupling theory and that becomes clear with virtual magnetic transmission-lines (VMGTLs) approach, is that MTMs induce a region of high gain and a passband region with minimum attenuation
Summary
Inductive-coupling based systems have shown to present enormous advantages over any other power and data transmission mechanisms like electromagnetic (EM) or acoustic waves in extreme environments, such as underground or underwater, once the vast majority of the materials in the Universe are magnetic insensitive (that is to say, their permeability is the same of free-space) Because of their strong material dependency, acoustic waves present low power density, extremely high latency and multipath problems, which makes them unsuitable for any reliable mission-critical or real-time Simultaneous Wireless Information and Power Transfer (SWIPT), while propagating EM modes tend to attenuate very quickly in such lossy media, as a consequence of their usually high conductivity and/or high permittivity values. The main results obtained using the VGMTL model are validated by numerical simulations
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