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Fabrication phases of the TE20-mode SIW resonator proposed as a dual-detection sensor: (a) Top SIW layer realized on Duroid 5880; (b) PDMS layer containing the two microfluidic channels; (c) Bottom layer of the SIW realized on Duroid 5880; (d) Colored water (red) injected into the microfluidic channels to verify a uniform and smooth filling; (e) Final prototype after inserting vias and soldering.
