Quasistatic Metamaterials: Magnetic Coupling Enhancement by Effective Space Cancellation

Abstract

A novel and broadly applicable way to increase magnetic coupling between distant circuits in the quasistatic regime is introduced. It is shown how the use of magnetic metamaterials enhances the magnetic coupling between emitting and receiving coils. Results are experimentally demonstrated by measuring a boost on the efficiency of the wireless transmission of power between distant circuits.

Enhancing the sensitivity of magnetic sensors by 3D metamaterial shells

“…Interestingly, besides concentrating the field, the shell is not modifying the phase of the applied field, as shown in Supplementary Figure S3, except for frequencies larger than 10 kHz, at which ohmic losses probably develop because of the conductivity of the funnels. Similarly as previous experimental results3544454647, we confirm the validity of our magnetic metamaterial, originally derived for the dc case, in the quasistatic region of low frequency electromagnetic waves.…”

“…In previous works in 2D cylindrical geometry304244 shells for concentrating magnetic fields (having μ ρ  → ∞ in the radial direction and μ ϕ  → 0 in the angular one) were devised and constructed using metamaterials composed of alternated sheets of soft ferromagnetic and superconducting material radially aligned. The ferromagnetic layers (FM, with high permeability) provided the required large μ ρ values whereas the superconducting (SC, with low permeability) - or simply conducting in ref.…”

“…The ferromagnetic layers (FM, with high permeability) provided the required large μ ρ values whereas the superconducting (SC, with low permeability) - or simply conducting in ref. 44- layers prevented undesired angular components of field.…”

Room-temperature broadband quasistatic magnetic cloak

“…This conceptual accomplishment has limited significance in practice, as a liquid-nitrogen temperature environment is an absolute requirement for any device involving SCs. Progress has been achieved by using non-superconducting magnetic metamaterials to enhance wireless power transmission 32 . In this work, we attempt to remove this hurdle in a magnetic cloak and unambiguously show the technical possibility of room-temperature broadband three-dimensional magnetic cloaking effect by using a proper combination of normally available materials.…”

Increasing Efficiency of a Wireless Energy Transfer System by Spatial Translational Transformation

“…Apart from super-lens, magnetic concentrators based on space compression transformation [13] was theoretically proposed to enhance energy transfer efficiency. With the help of metamaterials, such magnetic concentrator has been experimentally demonstrated [14].…”