Abstract
A wireless microfluidic sensor based on microwave reflection principle for liquid detection was introduced in this work. The presented sensor comprised a slot antenna and substrate integrated waveguide (SIW) resonator that is integrated with the microchannel using low temperature co-fired ceramic (LTCC) technology. The electromagnetic simulation has been carried out for the sensor structure optimization. The ethanol aqueous solution of 0-50% mole fraction and glucose aqueous solution of 0-600 mg/dL were used for demonstrating the liquid sensing performance of the proposed sensor, respectively. The wireless sensing signal was recorded and analyzed using a network analyzer with a robust interrogation antenna. As the result, the resonant frequency rises in a monotonic and linear manner as the increase of liquid concentrations. The normalized sensitivity of the sensor is 0.29% for deionized water, which is higher than that of the reported liquid sensors based on microwave method. The wireless microfluidic sensor provides a compact, rapid, and real-time monitoring method for liquid, and has wide application prospects in biomedicine and environment area.
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