Measurement of Permittivity of Solid and Liquid Dielectrics in Coaxial Chambers.

We present two coaxial chambers for measurements of the complex permittivity of solid and liquid samples, in a frequency range that is in the transition between lower frequencies, where parallel-plate capacitor techniques are used, and higher (microwave) frequencies, where antennas, open coaxial lines, and waveguides are employed. Using a network analyzer, we measure the reflection coefficient of the chamber. From the obtained results, we extract the relative permittivity of the measured sample using a quasistatic or a dynamic model of the chamber with the sample. [ABSTRACT FROM AUTHOR]