Abstract
This article reports on a complex permeability (μr=μ′r−jμʺr) analysis in the range from 50MHz to 13.5GHz of magnetic alloy thin films in an inductance transmission line (ITL). The ITL has shell-type closed magnetic circuit structures composed of magnetic films and a conductive line, and the reflection (Γ) and transmission (T) are measured with a two-port method. μʺr is estimated from Γ and T by analyzing multiple reflections in the ITL, and μ′r is obtained using the Kramers–Kronig relation. The μr−f characteristics for Co–Fe film are confirmed to be in relatively good agreement with results from an impedance measurement and with coupled Landau–Lifschitz and eddy current theories. The applicable conditions of this technique are discussed, and the requirements μ′rs⪡∼2500 and μ′rsfk⪡∼6500GHz are derived.
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