Impedance formulas for planar magnetic structures with spiralwindings
Hurley, W.G.; Duffy, M.C.; Oapos;Reilly, S.; Oapos;Mathuna, S.C.
Industrial Electronics, IEEE Transactions on
Volume 46, Issue 2, Apr 1999 Page(s):271 - 278
Digital Object Identifier 10.1109/41.753765
Summary:It is well established that magnetic components may be reduced in
size by operating at high frequency. Miniaturization of magnetic
components is ideally suited to microelectronics technologies such as
thick films, which lend them to planar geometries. This paper describes
new analytical models, which predict inductance- and frequency-dependent
eddy-current losses in magnetic substrates. Prototype devices were
fabricated by a thick-film process with four layers of conductors on a
single ferrite substrate and in a sandwich configuration, consisting of
conductors between ferrite slabs. The prototype devices were tested in
the frequency range 10 kHz-100 MHz. The measurements confirm the
validity of the analytical models. Simulation with finite-element
analysis was employed to identify different sources of losses: eddy
current losses in ferrite substrates; proximity effect losses in
conductors; and dielectric losses
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