Abstract
A method to extract complex permittivity of liquids using a coplanar waveguide fed open stub resonator is proposed in this paper. A quarter-wave long open stub printed on a substrate is used as the sensor for the computation of complex permittivity. The free-standing unloaded sensor is designed to operate at 1.8 GHz and resonates at a lower frequency when immersed in a test liquid. The resonant frequency and the reflection phase from the sensor are recorded for the computation of real and imaginary parts of the permittivity of the test sample. The simulated response of the sensor, when immersed in liquid samples of different permittivities, is validated by measurements. Equations␣for the extraction of real and imaginary values of permittivity are also presented in this paper. The experiments demonstrate that the sensor is capable of characterizing complex permittivity of liquids with minimal error.
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