Abstract
The guiding principle of the magnetic shield is to redirect magnetic fluxes so that they do not enter an area of interest. There are two ways to do this: the one way is to provide magnetic fluxes with good pathways and the other way is to use repulsive forces acting on the magnetic flux. In this paper, a new method of magnetic shielding combining the above two is proposed. A circulating current and a thin magnetic plate working as a back yoke are the key components. Repulsive forces that act on the magnetic fluxes originating from a noise source are present only on one side of a thin back yoke. By enclosing an area to be shielded with several of those, one can make a magnetic shield in which thin magnetic plates are not necessarily connected. Several numerical examples as well as experimental results are given to demonstrate this idea.
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