Metamaterial-enhanced coupling seen as non-Foster impedance matching
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2016
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INTERNATIONAL SYMPOSIUM ON ELECTRIC AND MAGNETIC FIELDS, 10th
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Resumo
Electrically small antennas (ESA) are characterized by high-Q impedances presenting
high reactance and low radiation resistance. Since in most wireless power transmission
(WPT) applications, such as inductive power transmission (IPT), to use a full-size
antenna is neither practical or desired, the system overall efficiency is usually very poor
due to the drivers large reactance. In the last decade, various works have demonstrated
that a class of artificial material called metamaterials (MTMs) can synthesize munegative
(MNG) media capable of evanescent-wave focusing which largely enhances
the coupling between ESA. In the present work, MTM-enhanced coupling in IPT
systems is examined. Adopting a lumped element approach to describe the general
MTM-enhanced IPT system, it is evidenced that MNG media can be interpreted as a
negative inductance (a non-Foster reactance) from a circuital point of view. This paper
also presents an approach based on energy density to calculate the module of the MNG
slab equivalent inductor.
Como referenciar
ALMEIDA, JORGE V. de; SIQUEIRA, GLAUCIO L.; MOSSO, MARBEY M.; MAIA, MARCO A.G.M.; SARTORI, CARLOS A.F. Metamaterial-enhanced coupling seen as non-Foster impedance matching. In: INTERNATIONAL SYMPOSIUM ON ELECTRIC AND MAGNETIC FIELDS, 10th, April 12-14, 2016, Lyon, France. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/27014. Acesso em: 17 Mar 2025.
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