Figure 7
The return loss (\({\mathrm{S}}_{11}\)) per frequency for (a) first (\({f}_{01}\)) and second (\({f}_{02}\)) resonance frequencies. (b) First resonance frequency (\({f}_{01}\)). (c) Second resonance frequency (\({f}_{02}\)) (line a: arm as MUT with no activity, line b: after 1 min activity, line c: after 2 min activity, line d: after 3 min activity, line e: after 4 min activity, line f: after 4 min activity, line g: after 5 min activity, line h: after 6 min activity).
