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The presence of an analyte influences the power transfer between the smartphone and CARD. (A) Average (n = 5) reflection coefficient (S11) of (1) baseline (no tag present), (2) unmodified NFC tag, (3) circuit-disrupted tag, (4) CARD-2, or (5) CARD-2 in the presence of cyclohexanone (equilibrium vapor pressure at ambient temperature and pressure) for 5 s and (6) for 1 min. (B) Average (n = 5) estimated power transfer (Pt) (13.53–13.58 MHz) from SGS4 to CARDs described in 1–6.
