A Device for Measuring the Complex Dielectric Constant of Liquid Dielectrics

A device for measuring the dielectric constant of liquid dielectrics using the waveguide method is described. Processing of the measurement results is based on the evaluation of the input impedance of the load, which is a segment of a waveguide line with a dielectric rod. It is proposed that measurements of the load reflection coefficient be performed at two frequencies, which allows the device to dispense with a measuring line. A technique for measuring and processing results is described. The measured dielectric constants of distilled water and cement mortar in the frequency range of 2.3–2.6 GHz are presented.