Microstrip resonator sensors for determination of complex permittivity of materials in sheet, liquid and paste forms

The microstrip patch resonator in several configurations can be used for determination of the dielectric constant and the loss tangent of materials available in sheet, paste and liquid forms. A suspended patch resonator was developed to determine the dielectric constant and loss tangent of wax, kerosene, petrol and vaseline. The measured dielectric constant of the sample is within ± 2% and the loss tangent has a variation ±0.001 for the sample with moderate loss.