fig3

Figure 3. (A) Schematic of the inductive coupling method of detecting signals using the wireless soft sensor; (B) Photo of the inductive coupling system setup. The sensor is attached to the inductive transmitting coil, which is coupled with the receiving coil. The receiving coil is connected to the vector network analyzer; (C) S₁₁ at the resonant frequency at different distances between the coils. The coils are kept concentric; (D) Quality factor from resonant frequency sweeps at different distances between the coils. The coils are kept concentric.