Abstract
This chapter presents three microwave sensors for glucose concentration detection. The sensors are based on open-loop microstrip resonators at several frequencies,equipped with special sample holders. A comprehensive discussion on the design guidelines is offered, focused on maximizing the sensitivity of the sensors to the changes in the permittivity of the samples. The optimization of the proposed sensors is demonstrated with electromagnetic simulations.Experimental measurement of water–glucose solutions at different concentrations with the sensors is shown. The results are analyzed, chiefly in terms of the sensitivities, and a thorough discussion is given, highlighting the best measurement technique.
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