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. 2021 Mar 5;21(5):1802. doi: 10.3390/s21051802

Figure 3.

Figure 3

Configuration of antenna: (a) Integrated with the circuit (A1); (b) Protected by two layer of varnish and flexible silicon (A2); (c) Placed next to the human body (A3); (d) Bent around the human’s wrist (A4).