Figure 6

Measurement results of the sensor based on the microfluidic device for glucose solutions in the concentration range of 50–500 mg/dL. (a) The overall change in 0.1–6.5 GHz, (b) enlarged view in 2.7–3.3 GHz, (c) the linear fitting diagram of the resonance frequency with the concentration of glucose solution, (d) the linear fitting diagram of S11 with the variation of the concentration of glucose solution.