A measuring device for the determination of the electric permittivity of materials in the frequency range 0.1-300 MHz

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Abstract
A device for the measuring of the complex permittivity in the 0.1 MHz-300 MHz range is presented. It is a resonant system on which we can easily fit the measurement cells of the laboratory used in the 1 Hz-4 GHz range. This device allows us to measure the loss angle of materials down to 0.4*10-3. After the description of the mechanical and electronic parts of the device, the authors give the calibration method used to obtain the real and imaginary components of the electric permittivity. Finally, they report the results of dielectric measurements performed with this device for a liquid crystal and a synthetic zeolite. Automatic data processing by means of a computer increases the rapidity of measurement and decreases the number of manual operations.