Permittivity Measurement of Sucrose Solution Using Complementary Spit-Ring Resonator Sensor

This paper presents measured complex permittivities of sucrose solutions using complementary split-ring resonator (CSRR) sensor. Instead of using the notch-type CSRR for measurement in the published literatures, a CSRR with a bandpass property is developed in this paper to measure the permittivities of sucrose solutions with different concentrations. As compared with the reference permittivities measured by the commercial coaxial probe, the proposed method with the CSRR sensor has the maximum relative errors of -4.56% and -12.67% for the real and imaginary parts of the permittivity, respectively. The measured permittivities also demonstrate that the concentration levels of the sucrose solutions can be accurately discriminated by using the radio-frequency sensing technology.