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Magnetic Shielding of an Copper foil Over an Aircoil

The magnetic field of an aircoil can be shielded or decreased by a copper foil. In figure 4.1 you can see a planar aircoil with an copper foil. It is positioned 2.5 mm over the coil. The frequency is 1 MHz and the flux is decreased about 15%.

Figure 4.1 flux density distribution over copper foil