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Title: The Complex Permittivity Of Rf Circuit Board Materials By Resonances Of A Stripline Section In The 0.2 To 15 Ghz Range
Author: G. Robert Traut
Source: 1997 Measurement Science Conference
Year Published: 1997
Abstract: long stripline (LSL) specimen, probed for microwave resonances through adjustable air gaps at the ends provides resonances over a wide frequency range useful for determining complex permittivity of the dielectric. This technique adapts to a wide range of specimen thicknesses, permittivities and stripline geometries. The lowest frequency resonance possible depends on the length selected in the 51 to 305 mm range. Specimen constructions can be bare coupons clamped with foil, clamped coupons with etched trace and clad ground plane or simply a section of bonded stripline assembly. Results with a variety of materials are shown. The cause for anomalous dissipation factor results at frequencies above about 15 GHz is unresolved.

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