Complex Permittivity Measurement using Planar Open Stub Resonator

Dielectric constant measurement using an open stub resonator is discussed in this paper. Using this technique complex permittivity of any liquid can be found from the reflection and phase response of the CPW fed sensor operating in the frequency range of 750 MHz to 850 MHz. Test solutions are prepared by combining highly miscible solvents in proper concentrations and change in resonant frequency of the sensor is calibrated using Keysight dielectric probe.