Abstract
We theoretically propose and experimentally demonstrate an active quasi-static magnetic cloak enabled by a single magnetic dipole. The cloaking effect can be achieved by active cancelation of the background magnetic field using the magnetic dipole. Compared with previous multi-unit designs, the single-unit design drastically reduces the number of control units required. It has potential applications in realizing the homogeneous field in wireless power transfer, magnetic resonance imaging, and other diffusion-based applications.
Highlights
Where φ1 and φ2 stand for the magnetic field inside and outside the object, H0 is the intensity of the background magnetic field, R is the radius of the circular object, and (r, θ) is the position in a polar coordinate
As a result of the merits, they have been studied in various near field cloaking and illusion phenomena,[24] such as the static electric field,[27] static magnetic field,[25,26] and heat flow.[27]
To overcome the limitation of a large unit number, we propose a single-unit field-cancelation method to realize active control of near field energy flow and experimentally implement the design in a quasi-static magnetic scenario: using a single magnetic dipole to realize the active cloaking effect
Summary
Where φ1 and φ2 stand for the magnetic field inside and outside the object, H0 is the intensity of the background magnetic field, R is the radius of the circular object, and (r, θ) is the position in a polar coordinate. To overcome the limitation of a large unit number, we propose a single-unit field-cancelation method to realize active control of near field energy flow and experimentally implement the design in a quasi-static magnetic scenario: using a single magnetic dipole to realize the active cloaking effect.
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