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Modeling for RF noise suppressor using a magnetic film on coplanar transmission line

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4 Author(s)
Ki Hyeon Kim ; Dept. of Electr. & Commun. Eng., Tohoku Univ., Japan ; Yamaguchi, M. ; Ikeda, S. ; Arai, K.

A finite-element method is applied to analyze the electromagnetic field and loss generation of a soft magnetic thin film on a coplanar transmission line for which the dimension of the magnetic film is designed to control the center frequency and bandwidth of the radio-frequency (RF) electromagnetic noise attenuation in the gigahertz range without external applied magnetic fields. The coplanar transmission line with characteristic impedance of 50 Ω has total width, width of signal line, and thickness of 400, 50, and 3 μm, respectively. The change of the magnetic field distribution, the induced surface current density on the coplanar transmission line, and hence the RF noise suppression by soft magnetic films are significant as a function of the width (50-2000 μm) and thickness (0.1, 0.3, 0.5, and 1 μm) of the magnetic film.

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Magnetics, IEEE Transactions on  (Volume:39 ,  Issue: 5 )