Accurate complex permittivity measurement of a microwave low loss dielectric combining waveguide reflection and transmission on a rectangular structure

The metrological use of a slab-loaded rectangular guide driven at a frequency corresponding to an integral number of half wavelengths in the sample is discussed. A simple swept reflectometer technique leads to the determination of the permittivity with an uncertainty of a few promille at X band. A similar technique is combined with a transmission method to determine low losses. An accuracy of a few tens of microradians has been achieved for loss angle.Anglai