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Enhanced Q double resonant active sensor for humidity and moisture effect elimination

In this paper, high-resolution ultra-high Q double resonant sensor is developed to eliminate humidity and moisture effect in microwave chemical sensing in uncontrolled environment. Double uncoupled split-ring resonators with close resonant frequencies are assisted with active circuitry to increase their quality factor from 51 and 54 up to 150k and 210k at 1.365 GHz and 1.6 GHz, respectively. The purpose of the second resonator is set to calibrate the erroneous effect of ambient humidity and sand moisture in measurement. Based on the proposed technique, root of mean-square-error of processed results of measuring water in humid air was significantly reduced from 169k down to 27k. Material detection with wet-sand surrounding was verified successfully and the materials impacts are completely distinguished from that of the wet sand.