Noncontact Measurement of Permittivity Based on CSRR at Microwave Frequencies

In this paper, we introduce a new two-sided sensor based on the complementary split-ring resonators (CSRRS) to the permittivity measurement at microwave frequencies. The electrically small samples are placed above the well-designed sensor, so that frequency offsets due to the samples can be detected to retrieve the permittivity. Analysis and simulations validate that by applying this method, permittivity can be linearly retrieved from the frequency offsets. The measurement setup can be conveniently calibrated with a given sample with known permittivity.