Calculation of the Differential Impedance of Tracks on FR4 Substrates

Abstract

There is a discrepancy between calculated and measured values of impedance for differential transmission lines on FR4. This is especially noticeable in the case of surface microstrip configurations. The anomaly is shown to be due to the nature of the substrate material. This needs to be considered as a layered structure of epoxy resin and glass fibre… (More)

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