Measurement of the complex refractive index of isotropic and anisotropic materials at 35 GHz using a free space microwave bridge

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Abstract
A description is given of measurements made at 35 GHz of the complex transmission coefficient for an isotropic and an anisotropic material using a free space microwave bridge. The medium-loss isotropic material exhibited the effects of multiple internal reflections which have been fully accounted for. In the case of the high-loss anisotropic material the complex reflection coefficient was also measured. The measurements were made in a microwave bridge with the sample placed in free space between horns, with a waveguide reference arm. Separate circuits for transmission and reflection are described. The anisotropic material consisted of coated, conducting parallel glass fibres moulded in an epoxy resin disc. Measurements are reported for the electric vector parallel and perpendicular to the fibre direction. Values of the refractive index n and the absorption index K where calculated from the measured complex transmission and reflection coefficients.

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