Commercial enclosed-winding inductor with inductance of 2.2 μH,
resistance of 7mΩ, height of 4 mm, and permeability of 35μ0 . (b) Axisymmetric
view of the commercial inductor showing unevenly distributed flux density
inside the core. (c) Three-dimensional structure of a CFI with winding enclosed
by core; total thickness is reduced by half to 2 mm, whereas inductance and
resistance are kept at 2.24 μHand 5.5mΩ with 35μ0 permeability. (d) Relatively
uniform distribution of flux density in the core of the CFI.