We propose an approximate analytical model for magnetic field penetration through a circular aperture on a perfectly conducting plate. The magnetic field source is a circular loop current placed parallel… Click to show full abstract
We propose an approximate analytical model for magnetic field penetration through a circular aperture on a perfectly conducting plate. The magnetic field source is a circular loop current placed parallel to the plate and coaxial with the aperture. It is shown that the aperture is equivalent to a magnetic quadrupole normal to the plate when the field point is far from the aperture. The model is validated using numerical simulations and a minor disagreement with experimental data is explained.
               
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