A novel microwave sensor for real-time chloride concentration analysis is reported. The sensor response to deionised water, KCl, MnCl_2 and CuCl solutions at 1M and 0.1M concentration was tested. The sensing element, in the form of a silver pattern, was printed on polyimide flexible laminate substrate to suit a broad range of applications. The developed system confirmed the viability of using microwaves for real-time chloride solutions monitoring as the reflected signals represented by S_(11) parameters were unique with clearly observed shifts in the resonant frequencies and amplitude changes when placed in direct contact with 20 μl of each solution.
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